Electrical Engineering (EE)
In a load flow solution Vi = 1.083∠150 pu and Vk = 0.986∠-20 pu. What is the direction of active power (P) and reactive power (Q) flow in the line i - k?- a)P and Q flow from i to k
- b)P flows from i to k and Q flows from k to i
- c)Both flow from k t o i
- d)Data is insufficient to determine direction
Correct answer is option 'A'. Can you explain this answer?
In a load flow solution Vi = 1.083∠150 pu and Vk = 0.986∠-20 pu. What is the direction of active power (P) and reactive power (Q) flow in the line i - k?
a)
P and Q flow from i to k
b)
P flows from i to k and Q flows from k to i
c)
Both flow from k t o i
d)
Data is insufficient to determine direction
JAI SRIVASTAVA answered • 1 hour agoSince active power flows from leading bus to lagging bus therefore, P will flow from i to k.
Since, reactive power flows from high potential bus to low potential bus therefore, Q will flow from i to k.
Since, reactive power flows from high potential bus to low potential bus therefore, Q will flow from i to k.
Fast acting excitation systems- a)improve transient stability.
- b)improve steady state stability.
- c)both (a) and (b).
- d)have no effect on stability of the system.
Correct answer is option 'A'. Can you explain this answer?
Fast acting excitation systems
a)
improve transient stability.
b)
improve steady state stability.
c)
both (a) and (b).
d)
have no effect on stability of the system.
SHASHANK MURARI answered • 1 hour agoFast field excitation system is one of the method to improve transient stability of the system.
Which of the following is a positive real function?- a)
- b)
- c)
- d)
Correct answer is option 'B'. Can you explain this answer?
Which of the following is a positive real function?
a)
b)
c)
d)
SHUBHAM KUMAR answered • 1 hour ago
Hence, notaPRF.
has a zero (s = 1) in RH s-plane.Hence, not a PRF.
has a pole and a zero in RH s-piane. Hence, not a PRF.
Option (b) is a PRF as all poles and zeros lie in LH s-plane.
Assertion (A): The principal of step-up chopper can be employed for the regenerative braking of dc motors.
Reason (R) : The step-up chopper can be employed in regenerative braking only for increasing motor speeds- a)Both A and R are true and R is the correct explanation of A.
- b)Both A and R are true but R is not the correct explanation of A
- c)A is true but R is false
- d)A is false but R is true
Correct answer is option 'C'. Can you explain this answer?
Assertion (A): The principal of step-up chopper can be employed for the regenerative braking of dc motors.
Reason (R) : The step-up chopper can be employed in regenerative braking only for increasing motor speeds
Reason (R) : The step-up chopper can be employed in regenerative braking only for increasing motor speeds
a)
Both A and R are true and R is the correct explanation of A.
b)
Both A and R are true but R is not the correct explanation of A
c)
A is true but R is false
d)
A is false but R is true
AKASH SINGH answered • 1 hour agoThe step-up chopper can be employed in regenerative braking both for increasing and decreasing motor speed provided duty cycle a is so adjusted that Vs/( 1 - a) exceeds the fixed source voiiage V0. Hence, reason is a false statement.
Lovika Chauhan asked • 1 hour agoA dc power supply has no load voltage of 30 V and full load voltage of 25 V at full load current of 1 A. The output resistance and voltage regulation respectively are- a)5 Ω and 25%
- b)25 Ω and 20%
- c)5 Ω and 16.7%
- d)25 Ω and 16.7%
Correct answer is option 'B'. Can you explain this answer?
A dc power supply has no load voltage of 30 V and full load voltage of 25 V at full load current of 1 A. The output resistance and voltage regulation respectively are
a)
5 Ω and 25%
b)
25 Ω and 20%
c)
5 Ω and 16.7%
d)
25 Ω and 16.7%
The main reason for connecting a pulse transformer at the output stage of a thyristor triggering circuit is to- a)reduce the turn on time of thyristor
- b)amplify the power of the triggering pulse
- c)avoid spurious triggering of the thyristor due to noise
- d)provide electrical isolation
Correct answer is option 'D'. Can you explain this answer?
The main reason for connecting a pulse transformer at the output stage of a thyristor triggering circuit is to
a)
reduce the turn on time of thyristor
b)
amplify the power of the triggering pulse
c)
avoid spurious triggering of the thyristor due to noise
d)
provide electrical isolation
SIDDHANT SHARMA answered • 1 hour agoPulse transformers are often used to couple a trigger pulse generator to a thyristor in order to obtain electrical isolation between the two circuits.
in present day measurement systems- a)direct methods are commonly used
- b)use of direct methods is limited but indirect methods are commonly used '
- c)both direct and indirect methods are commonly used
- d)none of the above
Correct answer is option 'B'. Can you explain this answer?
in present day measurement systems
a)
direct methods are commonly used
b)
use of direct methods is limited but indirect methods are commonly used '
c)
both direct and indirect methods are commonly used
d)
none of the above
ROHIT BISHT answered • 1 hour agoMeasurement by direct methods are not always possible, feasible and practicable. In most of the cases direct method of measurements are inaccurate because they involve human factors. Moreover, they are less sensitive. Due to these reasons use of direct method of measurement is limited while indirect methods are commonly used
A Wheatstone bridge requires a change of 8 a in the unknown arm of the bridge to produce a change in deflection of 3 mm of the galvanometer. The deflection factor (scale factor) is- a)0.375 mm/Ω
- b)2.67 Ω/mm
- c)24Ω-mm
- d)can’t be determined
Correct answer is option 'B'. Can you explain this answer?
A Wheatstone bridge requires a change of 8 a in the unknown arm of the bridge to produce a change in deflection of 3 mm of the galvanometer. The deflection factor (scale factor) is
a)
0.375 mm/Ω
b)
2.67 Ω/mm
c)
24Ω-mm
d)
can’t be determined
NISHANT MAURYA answered • 1 hour ago
The equivalent capacitance across the given terminals A-B is
- a)1/2μF
- b)3/4μF
- c)1/8μF
- d)4/3μF
Correct answer is option 'B'. Can you explain this answer?
The equivalent capacitance across the given terminals A-B is
a)
1/2μF
b)
3/4μF
c)
1/8μF
d)
4/3μF
KSHITIJ SURI answered • 1 hour agoThe equivalent combination of C2 and C3.
The equivalent combination of this 1 μF and
C1 = 2μF is
C1+ 1 μF = 3μF
Hence, the equivalent capacitance between terminals A and B is
C1+ 1 μF = 3μF
Hence, the equivalent capacitance between terminals A and B is
In the circuit shown below, the diode states at the extremely large negative value of the input voltage vi are
- a)D1 off, D2 on
- b)D1 off, D2 off
- c)D1 on, D2 on
- d)D1 on, D2 off
Correct answer is option 'D'. Can you explain this answer?
In the circuit shown below, the diode states at the extremely large negative value of the input voltage vi are
a)
D1 off, D2 on
b)
D1 off, D2 off
c)
D1 on, D2 on
d)
D1 on, D2 off
JEFFRIES BEVAN answered • 12 hours agoIf vi is of very large negative value Ivi| > |E|, then diode D1 will be forward biased (ON) while diode D2 will be reverse biased (OFF).
The output of a JK flipflop with asynchronous preset and clear inputs is ‘1’. The output can be changed to ‘0’ with one of the following conditions- a)By applying J = 0, K = 0 and using a clock
- b)By applying J = 1, K = 1 and using the clock
- c)By applying J = 1, K = 1 and using the clock
- d)By applying a synchronous preset input
Correct answer is option 'B'. Can you explain this answer?
The output of a JK flipflop with asynchronous preset and clear inputs is ‘1’. The output can be changed to ‘0’ with one of the following conditions
a)
By applying J = 0, K = 0 and using a clock
b)
By applying J = 1, K = 1 and using the clock
c)
By applying J = 1, K = 1 and using the clock
d)
By applying a synchronous preset input
MOHIT KUMAR answered • 12 hours agoPreset state of JK Flip-Flop =1 With J=1 K=1 and the clock next state will be complement of the present state
Which IC is used for the implementation of 1-to-16 DEMUX?- a)IC 74154
- b)IC 74155
- c)IC 74139
- d)IC 74138
Correct answer is option 'A'. Can you explain this answer?
Which IC is used for the implementation of 1-to-16 DEMUX?
a)
IC 74154
b)
IC 74155
c)
IC 74139
d)
IC 74138
ATUL RANJAN answered • 12 hours agoIC 74154 is used for the implementation of 1-to-16 DEMUX, whose output is inverted input.
Long back ago, magnetic casette were in use, having permanent magnet dc motors which had- a)magnets on stator and armature on rotor
- b)magnet on rotor and armature on stator
- c)electronic commutation
- d)all of the mentioned
Correct answer is option 'A'. Can you explain this answer?
Long back ago, magnetic casette were in use, having permanent magnet dc motors which had
a)
magnets on stator and armature on rotor
b)
magnet on rotor and armature on stator
c)
electronic commutation
d)
all of the mentioned
ALOK SINGH answered • 12 hours agoPMDC motors have field fixed on the stator and rotor has coils.
Anurag Kumar asked • 5 hours agoA point is 10 mm above HP and 20 mm behind VP. Its top view will be?
The cross field machines have- a)two fluxes electrically in quadrature
- b)two fluxes mechanically in quadrature
- c)one set of brushes per pole
- d)all of the mentioned
Correct answer is option 'A'. Can you explain this answer?
The cross field machines have
a)
two fluxes electrically in quadrature
b)
two fluxes mechanically in quadrature
c)
one set of brushes per pole
d)
all of the mentioned
UTKARSH TRIPATHI answered • 12 hours agoThe cross field machines have two fluxes electrically in quadrature.
Select the possible dc magnetization characteristics of permanent magnetic materials.- a)
- b)
- c)
- d)
Correct answer is option 'A'. Can you explain this answer?
Select the possible dc magnetization characteristics of permanent magnetic materials.
a)
b)
c)
d)
SUKHMANDEEP SINGH answered • 12 hours agoThe magnetic field has a positive value when the magnetic field intensity, H has negative value due to coercivity property. We use second quadrant of hysteresis loop.
Vaishali More asked • 9 hours agoAssertion (A): The TTL output acts as a current sink in low state Reason (R): The TTL input current is largest in low state.- a)Both A and R are correct and R is correct explanation of A
- b)Both A and R are correct but R is not correct explanation of A
- c)A is true, R is false
- d)A is false, R is true
Correct answer is option 'B'. Can you explain this answer?
Assertion (A): The TTL output acts as a current sink in low state
Reason (R): The TTL input current is largest in low state.
a)
Both A and R are correct and R is correct explanation of A
b)
Both A and R are correct but R is not correct explanation of A
c)
A is true, R is false
d)
A is false, R is true
Anil Swami asked • 11 hours agoConsider the following statements: In root-locus plot, the breakaway points
1. Ned not always be on real axis alone
2. Must lie on the root loci
4. Must lie between 0 and – 1
Which of these statements are correct ?- a)1, 2 and 3
- b)1 and 3
- c)2 and 3
- d)None of the above
Correct answer is option 'B'. Can you explain this answer?
Consider the following statements: In root-locus plot, the breakaway points
1. Ned not always be on real axis alone
2. Must lie on the root loci
4. Must lie between 0 and – 1
Which of these statements are correct ?
1. Ned not always be on real axis alone
2. Must lie on the root loci
4. Must lie between 0 and – 1
Which of these statements are correct ?
a)
1, 2 and 3
b)
1 and 3
c)
2 and 3
d)
None of the above
Irshad Shaikh asked • 12 hours agoThe action of JFET in its equivalent circuit can best be represented as a
- a) current controlled current source
- b) current controlled voltage source
- c) voltage controlled voltage source
- d) voltage controlled current source
Correct answer is option 'D'. Can you explain this answer?
The action of JFET in its equivalent circuit can best be represented as a
a)
current controlled current sourceb)
current controlled voltage sourcec)
voltage controlled voltage sourced)
voltage controlled current source 
Amit Parashar asked • 13 hours agoA 50 Hz, 11 kV, 3 phase alternator with earthed neutral having a reactance of 3 ohms per phase and is connected to a bus bar through a circuit breaker, if the distributed capacitance upto CB between the phase and neutral is 0.01 μ F.What is the peak re striking voltage?- a)18.36 kV
- b)17.96 kV
- c)15.96 kV
- d)12.65 kV
Correct answer is option 'B'. Can you explain this answer?
A 50 Hz, 11 kV, 3 phase alternator with earthed neutral having a reactance of 3 ohms per phase and is connected to a bus bar through a circuit breaker, if the distributed capacitance upto CB between the phase and neutral is 0.01 μ F.
What is the peak re striking voltage?
a)
18.36 kV
b)
17.96 kV
c)
15.96 kV
d)
12.65 kV
Sunil Manjani asked • 13 hours agoElectromagnetic waves are refracted when they- a)pass into a medium of different dielectric constant
- b)are polarized at right angles to the direction of propagation
- c)encounter a perfectly conducting surface
- d)pass through a small slot in a conducting plane
Correct answer is option 'A'. Can you explain this answer?
Electromagnetic waves are refracted when they
a)
pass into a medium of different dielectric constant
b)
are polarized at right angles to the direction of propagation
c)
encounter a perfectly conducting surface
d)
pass through a small slot in a conducting plane
φ = xy2z3 then match List-I with List-II and select the correct answer using the codes given below the lists: 
Potu Madhavi asked • 14 hours agoFor the same voltage drop, increasing the voltage of a distributor n-times.- a)reduces the x-section of the conductor by n times
- b)increases the x-section of the conductor by n times
- c)reduces the x-section of the conductor by n2 times
- d)increases the x-section of the conductor by n2 times.
Correct answer is option 'A'. Can you explain this answer?
For the same voltage drop, increasing the voltage of a distributor n-times.
a)
reduces the x-section of the conductor by n times
b)
increases the x-section of the conductor by n times
c)
reduces the x-section of the conductor by n2 times
d)
increases the x-section of the conductor by n2 times.
Mohsin Khan asked • 18 hours agoConsider the following statement: Distance relays used for protection of transmission line might operate undesirable due to
1. magnetizing-current in rush
2. Power swings
3. Series compensating capacitors
4. Switching over voltage
Of these statements- a)1 and 2 are correct
- b)2 and 3 are correct
- c)1, 2 and 4 are correct
- d)1, 3 and 4 are correct
Correct answer is option 'B'. Can you explain this answer?
Consider the following statement: Distance relays used for protection of transmission line might operate undesirable due to
1. magnetizing-current in rush
2. Power swings
3. Series compensating capacitors
4. Switching over voltage
Of these statements
1. magnetizing-current in rush
2. Power swings
3. Series compensating capacitors
4. Switching over voltage
Of these statements
a)
1 and 2 are correct
b)
2 and 3 are correct
c)
1, 2 and 4 are correct
d)
1, 3 and 4 are correct
HARSH RAJ asked • 19 hours agoA thin soap bubble of radius R = 1 cm, and thickness a = 3.3mm ( a << R ) , is at a potential of 1 V with respect to a reference point at infinity. The bubble bursts and becomes a single spherical drop of soap (assuming all the soap is contained in the drop) of radius r. The volume of the soap in the thin bubble is 4πR2a and that of the drop is 4/3πr3 .The potential in volts, of the resulting single spherical drop with respect to the same reference point at infinity is __________. (Give the answer up to two decimal places.)
Correct answer is between '9.50,10.50'. Can you explain this answer?
A thin soap bubble of radius R = 1 cm, and thickness a = 3.3mm ( a << R ) , is at a potential of 1 V with respect to a reference point at infinity. The bubble bursts and becomes a single spherical drop of soap (assuming all the soap is contained in the drop) of radius r. The volume of the soap in the thin bubble is 4πR2a and that of the drop is 4/3πr3 .The potential in volts, of the resulting single spherical drop with respect to the same reference point at infinity is __________. (Give the answer up to two decimal places.)
Rani Sandhu asked • 20 hours agoBuses for load flow studies are classified as (i)the load bus, (ii) the generator bus and (iii) the
slack bus The correct combination of the pair of quantities specified having their usual meaning for different buses is
- a)A
- b)B
- c)C
- d)D
Correct answer is option 'B'. Can you explain this answer?
Buses for load flow studies are classified as (i)the load bus, (ii) the generator bus and (iii) the
slack bus The correct combination of the pair of quantities specified having their usual meaning for different buses is
slack bus The correct combination of the pair of quantities specified having their usual meaning for different buses is
a)
A
b)
B
c)
C
d)
D
Dev Never Give Up asked • 21 hours agoTwo -insulator discs of identical capacitance value C makes up a string for a 22 kV, 50 Hz,single-phase overhead line insulation system. If the pin to earth capacitance is also C, then the string efficiency is- a)50%
- b)75%
- c)90%
- d)86%
Correct answer is option 'B'. Can you explain this answer?
Two -insulator discs of identical capacitance value C makes up a string for a 22 kV, 50 Hz,single-phase overhead line insulation system. If the pin to earth capacitance is also C, then the string efficiency is
a)
50%
b)
75%
c)
90%
d)
86%
Sunil Manjani asked • 22 hours agoA Wien-bridge is used to measure the frequency of the input signal. However, the input signal has 10% third harmonic distortion. Specifically the signal is 2 sin 400 πt + 0.2 sin 1200 πt (with t insec). With this input the balance will- a)Lead to a null indication and setting will correspond to a frequency of 200 Hz
- b)Lead to a null indication and setting will correspond to 260 Hz
- c)Lead to a null indication and setting will correspond to 400 Hz
- d)Not lead to null indication
Correct answer is option 'D'. Can you explain this answer?
A Wien-bridge is used to measure the frequency of the input signal. However, the input signal has 10% third harmonic distortion. Specifically the signal is 2 sin 400 πt + 0.2 sin 1200 πt (with t insec). With this input the balance will
a)
Lead to a null indication and setting will correspond to a frequency of 200 Hz
b)
Lead to a null indication and setting will correspond to 260 Hz
c)
Lead to a null indication and setting will correspond to 400 Hz
d)
Not lead to null indication
Dhake Pavan asked • 23 hours agoIn a shaded-pole induction motor, the rotor runs from the- a)shaded portion to the unshaded portion of the pole while the flux in the former leads that in the latter
- b)shaded portion to the unshaded portion of the pole while the flux in the former lags that in the latter
- c)unshaded portion to the shaded portion while the flux in the former leads that in the latter
- d)unshaded portion to the shaded portion while the flux in the former lags that in the latter
Correct answer is option 'C'. Can you explain this answer?
In a shaded-pole induction motor, the rotor runs from the
a)
shaded portion to the unshaded portion of the pole while the flux in the former leads that in the latter
b)
shaded portion to the unshaded portion of the pole while the flux in the former lags that in the latter
c)
unshaded portion to the shaded portion while the flux in the former leads that in the latter
d)
unshaded portion to the shaded portion while the flux in the former lags that in the latter
Pinkesh Patel asked • 23 hours agoThe open loop poles of a third order unity feedback system are at 0,-1,-2. Let the frequency corresponding to the point where the root locus of the system transits to unstable region be K. Now suppose we introduce a zero in the open loop transfer function at -3, while keeping all the earlier open loop poles intact. Which one of the following is TRUE about the point where the root locus of the modified system transits to unstable region?- a)It corresponds to a frequency greater than K
- b)It corresponds to a frequency less than K
- c)It corresponds to a frequency K
- d)Root locus of modified system never transits to unstable region
Correct answer is option 'D'. Can you explain this answer?
The open loop poles of a third order unity feedback system are at 0,-1,-2. Let the frequency corresponding to the point where the root locus of the system transits to unstable region be K. Now suppose we introduce a zero in the open loop transfer function at -3, while keeping all the earlier open loop poles intact. Which one of the following is TRUE about the point where the root locus of the modified system transits to unstable region?
a)
It corresponds to a frequency greater than K
b)
It corresponds to a frequency less than K
c)
It corresponds to a frequency K
d)
Root locus of modified system never transits to unstable region
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