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All questions of Estimation & Costing for Electrical Engineering (EE) Exam
What is the minimum clearance of HV Lines from ground across streets?- a)3.1 meters
- b)8.1 meters
- c)6.1 meters
- d)5.1 meters
Correct answer is option 'C'. Can you explain this answer?
What is the minimum clearance of HV Lines from ground across streets?
a)
3.1 meters
b)
8.1 meters
c)
6.1 meters
d)
5.1 meters
|
EduRev GATE answered |
According to IE rule 77,
No conductor of an overhead line, including service lines, erected across a street shall at any part thereof be at a height less than -
(a) For low and medium voltage lines - 5.8 metres
(b) For high voltage lines - 6.1 metres
The type of wiring that is highly suitable for a temporary shed is- a)Cleat wiring
- b)Wooden capping and casing wiring
- c)Lead sheathed wiring
- d)Conduit wiring
Correct answer is option 'A'. Can you explain this answer?
The type of wiring that is highly suitable for a temporary shed is
a)
Cleat wiring
b)
Wooden capping and casing wiring
c)
Lead sheathed wiring
d)
Conduit wiring
|
Ajay Mittal answered |
Cleat wiring is most suitable for a temporary shed.
The earthing electrodes should be placed within what distance in meters from the building whose installation system is being earthed- a)4
- b)2.5
- c)1.5
- d)0.5
Correct answer is option 'C'. Can you explain this answer?
The earthing electrodes should be placed within what distance in meters from the building whose installation system is being earthed
a)
4
b)
2.5
c)
1.5
d)
0.5
|
Manoj Mehra answered |
Various specifications in respect to earthing electrode as recommended by Indian Standards are given below.
1. An earthing electrode should not be situated (installed) close to the building whose installation system is being earthed at least more than 1.5m away.
2. The earth resistance should be low enough to cause the flow of current sufficient to operate the protective relays or blow fuses. Its value is not constant as it varies with weather because it depends on moisture (but should not be less than 1 Ohm).
3. The earth wire and earth electrode will be the same material.
4. The earthing electrode should always be placed in a vertical position inside the earth or pit so that it may be in contact with all the different earth layers.
When a high voltage overhead line passes over or adjacent to any building the vertical clearance between the highest part of the building immediately under such liner, recommended in IE rules is of not less than:- a)1.2 m
- b)2.8 m
- c)6 m
- d)3.7 m
Correct answer is option 'D'. Can you explain this answer?
When a high voltage overhead line passes over or adjacent to any building the vertical clearance between the highest part of the building immediately under such liner, recommended in IE rules is of not less than:
a)
1.2 m
b)
2.8 m
c)
6 m
d)
3.7 m
|
Prerna Menon answered |
According to IE rule 80,
Where a high or extra-high voltage over-head line passes above or adjacent to any building or part of a building it shall have on the basis of maximum sag a vertical clearance above the highest part of the building immediately under such line, of not less than
(a) For high voltage lines up to and including 33,000 volts - 3.7 metres
(b) For extra-high voltage lines - 3.7 metres plus 0.3 metre for every additional 33,000 volts or part thereof
The effect of electric shock on human body depends on:i. Currentii. Voltageiii. Duration of contact- a)Only i
- b)Only ii
- c)Only iii
- d)All i, ii & iii
Correct answer is option 'D'. Can you explain this answer?
The effect of electric shock on human body depends on:
i. Current
ii. Voltage
iii. Duration of contact
a)
Only i
b)
Only ii
c)
Only iii
d)
All i, ii & iii
|
Poulomi Ahuja answered |
The effect of electric shock on human body depends on current, voltage and the duration of contact.
For proper earthing, what should be the maximum value of earth resistance while carrying out the testing of earth continuity path?- a)1 Ω
- b)2 Ω
- c)5 Ω
- d)10 Ω
Correct answer is option 'A'. Can you explain this answer?
For proper earthing, what should be the maximum value of earth resistance while carrying out the testing of earth continuity path?
a)
1 Ω
b)
2 Ω
c)
5 Ω
d)
10 Ω
|
Juhi Joshi answered |
For proper earthing, the maximum value of earth resistance while carrying out the testing of earth continuity path should be around 1 ohm.
In earthed neutral system, the magnitude of transient voltage is:- a)Zero
- b)Vary small
- c)Medium
- d)Very high
Correct answer is option 'B'. Can you explain this answer?
In earthed neutral system, the magnitude of transient voltage is:
a)
Zero
b)
Vary small
c)
Medium
d)
Very high
|
|
Sanskriti Desai answered |
In earthed neutral system, the neutral is earthed either directly or through resistance or reactance depends on the requirement.
The advantages of neutral earthing are,
1. The arcing grounds are prevented from occurring by employing suitable switchgears
2. As the neutral point is not shifted in this system, thus the voltages of healthy phase’s remains nearly constant
3. The faulty part of the system can be isolated from the remaining system with the help of earth fault relays
4. The magnitude of transient voltage is very small
5. This is system is more reliable, provides safety to personnel and equipment with reduced operational and maintenance cost than ungrounded system
In case of electric fire, use:- a)CO2
- b)N2S
- c)SO2
- d)Cl2
Correct answer is option 'A'. Can you explain this answer?
In case of electric fire, use:
a)
CO2
b)
N2S
c)
SO2
d)
Cl2
|
|
Rahul Banerjee answered |
Class C type fire extinguishers can be used for electrical fires. While the extinguishment of electrical fire,
1. If possible, remove the source of energy by unplugging or disconnecting the electrical equipment
2. Use carbon dioxide, ordinary (BC rated) dry chemical, multi-purpose dry chemical and halon fire extinguishers
3. Do not use water on any energized electrical equipment
What is meant by contingencies?i. The list of required components are included in this categoryii. The list of vague and unforeseen items is included in this categoryiii. The list of components along with their discounted prices is included in this category- a)Only i
- b)Only ii
- c)Only iii
- d)Both ii and iii
Correct answer is option 'B'. Can you explain this answer?
What is meant by contingencies?
i. The list of required components are included in this category
ii. The list of vague and unforeseen items is included in this category
iii. The list of components along with their discounted prices is included in this category
a)
Only i
b)
Only ii
c)
Only iii
d)
Both ii and iii
|
Samridhi Bose answered |
The unforeseen items are the items which are unpredictable. The list of vague and unforeseen items is included in contingencies.
Which type of neutral grounding method has high transient voltages appear under fault conditions?- a)Solid grounding
- b)Resistance grounding
- c)Reactance grounding
- d)Plate grounding
Correct answer is option 'C'. Can you explain this answer?
Which type of neutral grounding method has high transient voltages appear under fault conditions?
a)
Solid grounding
b)
Resistance grounding
c)
Reactance grounding
d)
Plate grounding
|
Sanchita Choudhary answered |
Solid grounding: In this type of neutral grounding, the neutral of the system is directly connected to the ground through a conductor of negligible resistance and reactance.
Resistance grounding: In this type of neutral grounding, the neutral of the system is connected to ground through one or more resistance. Resistance grounding limits the fault currents. It protects the system from transient over voltages
Reactance grounding: In this method, a reactance is inserted between the neutral and ground to limit the fault current. This method has high transient voltages appear under fault conditions
In practice, Earth is chosen as a place of zero electric potential because it:- a)Is non-conducting
- b)Is easily available reference
- c)Keeps losing and gaining electric charge every day
- d)Has almost constant potential
Correct answer is option 'D'. Can you explain this answer?
In practice, Earth is chosen as a place of zero electric potential because it:
a)
Is non-conducting
b)
Is easily available reference
c)
Keeps losing and gaining electric charge every day
d)
Has almost constant potential
|
|
Ameya Sen answered |
Earth is chosen as a place of zero electric potential because it has almost constant potential.
The earth’s potential is taken is –- a)Infinite
- b)Supply voltage
- c)1 volt
- d)Zero
Correct answer is option 'D'. Can you explain this answer?
The earth’s potential is taken is –
a)
Infinite
b)
Supply voltage
c)
1 volt
d)
Zero
|
|
Samridhi Bose answered |
Earth is chosen as a place of zero electric potential because it has almost constant potential.
Minimum distance of underground cable from the foundation of building should be- a)100 cm
- b)50 cm
- c)10 cm
- d)5 cm
Correct answer is option 'C'. Can you explain this answer?
Minimum distance of underground cable from the foundation of building should be
a)
100 cm
b)
50 cm
c)
10 cm
d)
5 cm
|
Bibek Saha answered |
As per IE rules Minimum distance of underground cable from the foundation of building should be 10 cm.
As per IE rules the maximum allowable variation between declared and actual voltage at consumer’s premises should be- a)± 4 %
- b)± 4.5 %
- c)± 3 %
- d)± 3.5 %
Correct answer is option 'C'. Can you explain this answer?
As per IE rules the maximum allowable variation between declared and actual voltage at consumer’s premises should be
a)
± 4 %
b)
± 4.5 %
c)
± 3 %
d)
± 3.5 %
|
Mansi Choudhury answered |
As per IE rules the maximum allowable variation between declared and actual voltage at consumer’s premises should be ± 3%
What is the dimensions of the copper strips used for the strip earthing?- a)25 mm × 4 mm
- b)25 mm × 3 mm
- c)30 mm × 4 mm
- d)30 mm × 3 mm
Correct answer is option 'A'. Can you explain this answer?
What is the dimensions of the copper strips used for the strip earthing?
a)
25 mm × 4 mm
b)
25 mm × 3 mm
c)
30 mm × 4 mm
d)
30 mm × 3 mm
|
Sushant Mehta answered |
In the method of strip earthing, strip electrodes of cross-section not less than 25mm x 1.6mm (1in x 0.06in) is buried in a horizontal trenches of a minimum depth of 0.5m. If copper is used then the dimension will be cross-section of 25mm x 4mm (1in x 0.15in) and if galvanized iron or steel is used then dimension of 3.0 mm2 is used.
Earth resistance comprises ofA. Resistance of soil away from electrodeB. Contact resistance between electrode and soilC. Resistance of metal electrode- a)A only
- b)A and B only
- c)A and C only
- d)A, B and C together
Correct answer is option 'D'. Can you explain this answer?
Earth resistance comprises of
A. Resistance of soil away from electrode
B. Contact resistance between electrode and soil
C. Resistance of metal electrode
a)
A only
b)
A and B only
c)
A and C only
d)
A, B and C together
|
|
Rajveer Saha answered |
The resistance offered by the earth electrode to the flow of current into the ground is known as the earth resistance or resistance to earth. It comprises of
1) Resistance of soil away from electrode
2) Contact resistance between electrode and soil
3) Resistance of metal electrode
Which material is used for wiring continuous bus bar?i. Aluminumii. Copper- a)Only i
- b)Only ii
- c)Both I and ii
- d)None of these
Correct answer is option 'A'. Can you explain this answer?
Which material is used for wiring continuous bus bar?
i. Aluminum
ii. Copper
a)
Only i
b)
Only ii
c)
Both I and ii
d)
None of these
|
Tanishq Majumdar answered |
Aluminum is used for wiring continuous bus bar because its cost is lesser than the copper.
What is the maximum load that can be connected in a circuit connecting only lighting points?- a)500 watts
- b)750 watts
- c)800 watts
- d)1000 watts
Correct answer is option 'C'. Can you explain this answer?
What is the maximum load that can be connected in a circuit connecting only lighting points?
a)
500 watts
b)
750 watts
c)
800 watts
d)
1000 watts
|
Malavika Nair answered |
In a circuit connecting only lighting points, the maximum load that can be connected is determined by the current rating of the circuit and the wattage of each lighting point.
1. Current rating of the circuit:
The current rating of a circuit is determined by the rating of the protective device, such as a fuse or a circuit breaker. This rating is usually specified in amperes (A). To calculate the maximum load that can be connected, we need to know the current rating of the circuit.
2. Wattage of each lighting point:
The wattage of each lighting point refers to the power consumption of the light bulbs or fixtures that are connected to the circuit. This wattage is usually specified in watts (W). To calculate the maximum load that can be connected, we need to know the wattage of each lighting point.
3. Calculation:
To determine the maximum load that can be connected in the circuit, we can use the formula:
Maximum Load (in watts) = Current Rating (in amperes) x Voltage (in volts)
Since the voltage is not given in the question, we can assume a standard voltage of 120 volts for residential lighting circuits.
Let's consider the options given in the question:
a) 500 watts: This option does not provide any information about the current rating of the circuit, so we cannot determine if it is the correct answer.
b) 750 watts: This option does not provide any information about the current rating of the circuit, so we cannot determine if it is the correct answer.
c) 800 watts: This option does not provide any information about the current rating of the circuit, so we cannot determine if it is the correct answer.
d) 1000 watts: This option does not provide any information about the current rating of the circuit, so we cannot determine if it is the correct answer.
Since none of the options provide the necessary information to calculate the maximum load, we cannot determine the correct answer based on the given options.
1. Current rating of the circuit:
The current rating of a circuit is determined by the rating of the protective device, such as a fuse or a circuit breaker. This rating is usually specified in amperes (A). To calculate the maximum load that can be connected, we need to know the current rating of the circuit.
2. Wattage of each lighting point:
The wattage of each lighting point refers to the power consumption of the light bulbs or fixtures that are connected to the circuit. This wattage is usually specified in watts (W). To calculate the maximum load that can be connected, we need to know the wattage of each lighting point.
3. Calculation:
To determine the maximum load that can be connected in the circuit, we can use the formula:
Maximum Load (in watts) = Current Rating (in amperes) x Voltage (in volts)
Since the voltage is not given in the question, we can assume a standard voltage of 120 volts for residential lighting circuits.
Let's consider the options given in the question:
a) 500 watts: This option does not provide any information about the current rating of the circuit, so we cannot determine if it is the correct answer.
b) 750 watts: This option does not provide any information about the current rating of the circuit, so we cannot determine if it is the correct answer.
c) 800 watts: This option does not provide any information about the current rating of the circuit, so we cannot determine if it is the correct answer.
d) 1000 watts: This option does not provide any information about the current rating of the circuit, so we cannot determine if it is the correct answer.
Since none of the options provide the necessary information to calculate the maximum load, we cannot determine the correct answer based on the given options.
One among the following is the top most conductors in high voltage transmission lines, identify it.- a)R- phase conductor
- b)Y- phase conductor
- c)B- phase conductor
- d)Earth conductor
Correct answer is option 'D'. Can you explain this answer?
One among the following is the top most conductors in high voltage transmission lines, identify it.
a)
R- phase conductor
b)
Y- phase conductor
c)
B- phase conductor
d)
Earth conductor
|
Muskaan Nair answered |
A guard wire or earth wire is the top most conductors in high voltage transmission lines. It is used mainly to protect lines from lightning. If in case lightning struck then it carries the excessive current inrush to ground.
Its radius is much smaller than the actual transmission wire because as the resistance is inversely proportional to area of cross section and as the cross section decreases, the resistance increases. The increased resistance of earth wire is able to withstand high inrush of current caused due to lightning and it will safely guide this inrush into ground.
What is the factor of safety used for current ratings in a power installation?- a)1
- b)1.5
- c)1.75
- d)2
Correct answer is option 'D'. Can you explain this answer?
What is the factor of safety used for current ratings in a power installation?
a)
1
b)
1.5
c)
1.75
d)
2
|
Ankita Das answered |
Factor of safety describes the load carrying capacity of a system beyond the expected or actual loads. The factor of safety used for current ratings in a power installation is 2
Setting depth of poles is- a)1/4 part of the length of pole
- b)1/5 part of the length of pole
- c)1/8 part of the length of pole
- d)1/2 part of the length of pole
Correct answer is option 'B'. Can you explain this answer?
Setting depth of poles is
a)
1/4 part of the length of pole
b)
1/5 part of the length of pole
c)
1/8 part of the length of pole
d)
1/2 part of the length of pole
|
|
Aman Datta answered |
Setting depth of poles is 1/5 part of the length of pole. The depth for most heavy poles should be at least two feet. Another rule of thumb is that the hole’s depth should be 1/5 of the length of the poles and below the frost line.
Normally the human body resistance in totally wet and dry condition is ________ respectively.- a)1 k Ω and 1 MΩ
- b)0.1 Ω and 10 kΩ
- c)100 Ω and 1 kΩ
- d)100 Ω and 10 kΩ
Correct answer is option 'A'. Can you explain this answer?
Normally the human body resistance in totally wet and dry condition is ________ respectively.
a)
1 k Ω and 1 MΩ
b)
0.1 Ω and 10 kΩ
c)
100 Ω and 1 kΩ
d)
100 Ω and 10 kΩ
|
|
Samridhi Bose answered |
Under dry conditions, the resistance offered by the human body may be as high as one mega ohms. Wet or broken skin may drop the body's resistance to 1000 ohms. Adding that, high-voltage electrical energy quickly breaks down human skin, reducing the human body's resistance to 500 ohms.
For reducing tower footing resistance, it is better to use- a)Chemical and ground rod only
- b)Chemical and counterpoise only
- c)Ground rod and counterpoise only
- d)None of these
Correct answer is option 'C'. Can you explain this answer?
For reducing tower footing resistance, it is better to use
a)
Chemical and ground rod only
b)
Chemical and counterpoise only
c)
Ground rod and counterpoise only
d)
None of these
|
Madhurima Das answered |
Tower footing resistance is the resistance offered by the tower footing to the dissipation of ground. The effective ground wire depends to a large extend on the tower footing resistance. The tower top potential depends on this resistance.
Low value of tower footing resistance results in less voltage stresses across line insulation. A tower footing resistance of 20 ohm for EHV lines and 10 ohm for HV lines provides sufficient lightning protection.
Tower footing resistance depends on
1) Type of electrode configuration employed
2) Soil resistivity
3) Electrode shapes (Hemisphere, vertical driven rod, and Buried horizontal wires)
Methods for tower grounding are:
Buried Conductor: One or more conductors are connected to tower legs and buried in back filled of tower foundation. It is used when soil resistivity is low
Counterpoise Wire: A wire/ Strip of length of 50 m is buried horizontally at depth of 0.5 m below ground. This wire is connected to tower legs. It is used when earth resistance is very high and soil conductivity is mostly confined to upper layer
Ground rod: Pipe/Rod of 3 to 4 m is driven into ground near the tower and top of rod is connected to tower by suitable wire/strip. It is used where ground conductivity increase with depth
Treated Earth Pits: Pipe/Rod of 3 to 4 m are buried in treated earth pits and top of rod is connected to tower by suitable wire/strip. It is used in very high resistivity near tower
For reducing tower footing resistance, it is better to use ground rod and counterpoise only.
Which statement is true, with respect to the motor installation?- a)Wood work is used for mounting switchgears
- b)All equipment used in power wiring shall be of iron clad
- c)Looping of conductors is usually made
- d)The length of flexible conduit is more than 3 m
Correct answer is option 'B'. Can you explain this answer?
Which statement is true, with respect to the motor installation?
a)
Wood work is used for mounting switchgears
b)
All equipment used in power wiring shall be of iron clad
c)
Looping of conductors is usually made
d)
The length of flexible conduit is more than 3 m
|
|
Mihir Chawla answered |
1. Wood is not used for mounting switchgears
2. All equipment used in power wiring shall be of iron clad
3. Electrical looping is loop/loops created between two light with 1 single wire connected to multiple fittings. Usually looping is done for neutral wire. Neutral wire is a return wire for the current in an electrical circuit, i.e. it carries electricity from the output device back to the service panel/board
4. The length of flexible conduit is less than 1.8 m
For the measurement of the earth resistance of a given earth electrode:- a)Collecting electrode should be very near to the electrode under test
- b)Collecting electrode should touch the electrode under test
- c)Collecting electrode should be far way the electrode under test
- d)None of these
Correct answer is option 'C'. Can you explain this answer?
For the measurement of the earth resistance of a given earth electrode:
a)
Collecting electrode should be very near to the electrode under test
b)
Collecting electrode should touch the electrode under test
c)
Collecting electrode should be far way the electrode under test
d)
None of these
|
|
Sneha Bose answered |
Measurement of Earth Resistance:
Collecting electrode distance:
The correct answer is option 'C', which states that the collecting electrode should be far away from the electrode under test for the measurement of earth resistance. This is because if the collecting electrode is too close to the electrode under test, it may affect the measurement due to the influence of the test current on the electrode. Therefore, proper distance between the electrodes is crucial for accurate measurement.
Factors affecting distance:
There are several factors that can affect the distance between the electrodes, including the size and shape of the electrodes, the depth of the test, and the soil resistance. In general, a distance of at least 20 times the depth of the electrode is recommended for accurate measurement.
Procedure:
The procedure for measuring earth resistance involves connecting the test electrode to the earth and injecting a test current into the earth. The voltage drop between the test electrode and the collecting electrode is then measured, and the earth resistance is calculated using Ohm's law.
Conclusion:
In conclusion, the correct distance between the electrodes is essential for accurate measurement of earth resistance. The collecting electrode should be far away from the electrode under test, and a distance of at least 20 times the depth of the electrode is recommended for accurate measurement. The procedure involves injecting a test current and measuring the voltage drop, and the earth resistance is calculated using Ohm's law.
Collecting electrode distance:
The correct answer is option 'C', which states that the collecting electrode should be far away from the electrode under test for the measurement of earth resistance. This is because if the collecting electrode is too close to the electrode under test, it may affect the measurement due to the influence of the test current on the electrode. Therefore, proper distance between the electrodes is crucial for accurate measurement.
Factors affecting distance:
There are several factors that can affect the distance between the electrodes, including the size and shape of the electrodes, the depth of the test, and the soil resistance. In general, a distance of at least 20 times the depth of the electrode is recommended for accurate measurement.
Procedure:
The procedure for measuring earth resistance involves connecting the test electrode to the earth and injecting a test current into the earth. The voltage drop between the test electrode and the collecting electrode is then measured, and the earth resistance is calculated using Ohm's law.
Conclusion:
In conclusion, the correct distance between the electrodes is essential for accurate measurement of earth resistance. The collecting electrode should be far away from the electrode under test, and a distance of at least 20 times the depth of the electrode is recommended for accurate measurement. The procedure involves injecting a test current and measuring the voltage drop, and the earth resistance is calculated using Ohm's law.
What is the minimum permissible size of the earth continuity conductor?- a)6 sq. mm
- b)9 sq. mm
- c)11 sq. mm
- d)13 sq. mm
Correct answer is option 'A'. Can you explain this answer?
What is the minimum permissible size of the earth continuity conductor?
a)
6 sq. mm
b)
9 sq. mm
c)
11 sq. mm
d)
13 sq. mm
|
|
Hiral Kulkarni answered |
The minimum permissible size of the earth continuity conductor is 6 sq. mm.
What is an electrical schedule?i. A list or a plan of a building providing information of number of points in each roomii. The list of all the electrical components required for a particular roomiii. The list all the electrical components along with their prices- a)Only i
- b)Only ii
- c)Both ii and iii
- d)None of these
Correct answer is option 'A'. Can you explain this answer?
What is an electrical schedule?
i. A list or a plan of a building providing information of number of points in each room
ii. The list of all the electrical components required for a particular room
iii. The list all the electrical components along with their prices
a)
Only i
b)
Only ii
c)
Both ii and iii
d)
None of these
|
|
Bijoy Mehta answered |
Electrical schedule is a list or a plan of a building providing information of number of points in each room
What is the maximum length of the flexible conduit in motor installation?- a)Less than 1.25 m
- b)Less than 2.25 m
- c)Less than 3.5 m
- d)Can exceed not more than 5 m
Correct answer is option 'A'. Can you explain this answer?
What is the maximum length of the flexible conduit in motor installation?
a)
Less than 1.25 m
b)
Less than 2.25 m
c)
Less than 3.5 m
d)
Can exceed not more than 5 m
|
Mayank Sengupta answered |
According to Indian Electricity rules, the maximum length of the flexible conduit in motor installation is should be less than 1.25 m
Mixture preferred for filling around the earth electrode for effective earthing is:- a)Pepper-salt mixture
- b)Saw dust mixture
- c)Coal-salt mixture
- d)Lime-sand mixture
Correct answer is option 'C'. Can you explain this answer?
Mixture preferred for filling around the earth electrode for effective earthing is:
a)
Pepper-salt mixture
b)
Saw dust mixture
c)
Coal-salt mixture
d)
Lime-sand mixture
|
|
Samridhi Bose answered |
Coal salt mixture is preferred for filling around the earth electrode for effective earthing.
Coal is made of carbon which is good conductor minimizing the earth resistant. Salt use as electrolyte to form conductivity between GI Plate Coal and Earth with humidity. Sand is used to form porosity to cycle water & humidity around the mixture.
While using wooden poles in a services line, the span should not exceed- a)100 to 300 m
- b)60 to 100 m
- c)50 to 80 m
- d)40 to 50 m
Correct answer is option 'D'. Can you explain this answer?
While using wooden poles in a services line, the span should not exceed
a)
100 to 300 m
b)
60 to 100 m
c)
50 to 80 m
d)
40 to 50 m
|
|
Samridhi Bose answered |
While using wooden poles in a services line, the span should not exceed 40 to 50 m.
Overhead lines for power supply to tram cars are at a minimum height of- a)3 m
- b)6 m
- c)10 m
- d)20 m
Correct answer is option 'C'. Can you explain this answer?
Overhead lines for power supply to tram cars are at a minimum height of
a)
3 m
b)
6 m
c)
10 m
d)
20 m
|
|
Athira Pillai answered |
According to IE rules, Overhead lines for power supply to tram cars are should be at a minimum height of 10 m
The addition of ground rods in the earthing grid:- a)Decrease the earth resistance
- b)Has no effect on earth resistance
- c)Slightly decrease the earth resistance
- d)Slightly increase the earth resistance
Correct answer is option 'C'. Can you explain this answer?
The addition of ground rods in the earthing grid:
a)
Decrease the earth resistance
b)
Has no effect on earth resistance
c)
Slightly decrease the earth resistance
d)
Slightly increase the earth resistance
|
Puja Shah answered |
Since the resistance of the earth near each ground rod will be very high, adding a second ground rod we can slightly reduce the overall grounding resistance. Ground rods would need to be spaced 7.6 m apart to achieve the best grounding effect.
For what voltage levels are the screwed conduit circuits used?- a)Less than 250 V
- b)Between 250 V - 600 V
- c)Above 600 V
- d)None of these
Correct answer is option 'B'. Can you explain this answer?
For what voltage levels are the screwed conduit circuits used?
a)
Less than 250 V
b)
Between 250 V - 600 V
c)
Above 600 V
d)
None of these
|
|
Anshika Khanna answered |
The screwed conduit circuits are used to protect the electrical wiring. It is used for the voltage levels in between 250 V to 600 V.
In which type of wiring vulcanized Indian rubber (VIR) and polyvinyl chloride (PVC) insulated wires are used as conductors- a)CTS wiring
- b)Cleat wiring
- c)Lead sheathed wiring
- d)Conduit wiring
Correct answer is option 'B'. Can you explain this answer?
In which type of wiring vulcanized Indian rubber (VIR) and polyvinyl chloride (PVC) insulated wires are used as conductors
a)
CTS wiring
b)
Cleat wiring
c)
Lead sheathed wiring
d)
Conduit wiring
|
|
Samridhi Bose answered |
Vulcanized Indian Rubber: These consists of a copper conductor covered with an insulation layer of VIR. A cotton tape covering is provided over this insulation layer to protect the wire from moisture and to provide mechanical strength to the wire. These type of wires are used in 250 V CTS wiring, casing or capping or cleat wiring.
Polyvinyl Chloride: These wires consists of a conductor over which an insulation layer made up of Polyvinyl Chloride is provided. These wires cannot resist much heat and they have relatively low melting points, so they aren’t used in hot places and also these wires are not used with heating appliances. These wires are applied in casing wiring and also used along with cleat wiring
As per IE rules the permissible variation of voltage at the consumer end is:- a)±6%
- b)±10%
- c)±12%
- d)±2%
Correct answer is option 'A'. Can you explain this answer?
As per IE rules the permissible variation of voltage at the consumer end is:
a)
±6%
b)
±10%
c)
±12%
d)
±2%
|
|
Saranya Mishra answered |
As per IE rules the permissible variation of voltage at the consumer end is ±6%.
In the case of low or medium voltage, it is more than 6 percent.
In the case of high voltage, it is more than 6 per cent on the higher side or by more than 9 per cent on the lower side.
The purpose of earthing electric appliances is:- a)To provide safety against shock
- b)To ensure that the appliances work properly
- c)To ensure that the appliances get full voltage
- d)None of the above
Correct answer is option 'A'. Can you explain this answer?
The purpose of earthing electric appliances is:
a)
To provide safety against shock
b)
To ensure that the appliances work properly
c)
To ensure that the appliances get full voltage
d)
None of the above
|
|
Swati Tiwari answered |
The earthing is essential because,
1. The earthing protects the personnel from the short circuit current hence it provides safety against shock
2. The earthing provides the easiest path to the flow of short circuit current even after the failure of the insulation
3. The earthing protects the apparatus and personnel from the high voltage surges and lightning discharge
The aluminium conductor of size ______ is used for sub circuit in domestic wiring- a)
- b)
- c)
- d)
Correct answer is option 'C'. Can you explain this answer?
The aluminium conductor of size ______ is used for sub circuit in domestic wiring
a)
b)
c)
d)
|
Prashanth Mehra answered |
The size of aluminium conductor used for sub circuit in domestic wiring should be 
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