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Test: Utilization of Electrical Energy- 2 - Electrical Engineering (EE) MCQ


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20 Questions MCQ Test SSC JE Electrical Mock Test Series 2025 - Test: Utilization of Electrical Energy- 2

Test: Utilization of Electrical Energy- 2 for Electrical Engineering (EE) 2024 is part of SSC JE Electrical Mock Test Series 2025 preparation. The Test: Utilization of Electrical Energy- 2 questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Utilization of Electrical Energy- 2 MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Utilization of Electrical Energy- 2 below.
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Test: Utilization of Electrical Energy- 2 - Question 1

In dielectric heating, the current flows through:

Detailed Solution for Test: Utilization of Electrical Energy- 2 - Question 1

Upon application of an alternating electrical field, a displacement current caused by polarization and a conduction current caused by the presence of free, electrically charged particles appear in the dielectric. The flow of the total current causes the liberation of heat.

Test: Utilization of Electrical Energy- 2 - Question 2

In induction heating, the depth up to which the current will penetrate is proportional to:

Detailed Solution for Test: Utilization of Electrical Energy- 2 - Question 2

The depth of penetration of induced currents into the disc is given by:

Where, ρ is the specific resistance in Ω-cm

f is the frequency in Hz

μ is the permeability of the charge

The depth up to which the current will penetrate is inversely proportional to square of the frequency

Test: Utilization of Electrical Energy- 2 - Question 3

In submerged arc furnaces, the power is controlled by:

Detailed Solution for Test: Utilization of Electrical Energy- 2 - Question 3

In submerged arc furnaces, the power is controlled by

1. By varying the length of the arc by raising or lowering the electrodes thereby varying the resistance of the arc

2. By varying the applied voltage by the use of tappings provided on the primary side of furnace transformer

Test: Utilization of Electrical Energy- 2 - Question 4

In direct arc furnace, which of the following is of high value?

Detailed Solution for Test: Utilization of Electrical Energy- 2 - Question 4

In direct arc furnace, when supply is given to the electrodes, two arcs are established and current passes through the charge. The arc is in direct contact with the charge and heat is also produced by current flowing through the charge itself. In direct arc furnace current value is high.

Test: Utilization of Electrical Energy- 2 - Question 5

During the resistance welding, the heat produced at the joint is proportional to:

Detailed Solution for Test: Utilization of Electrical Energy- 2 - Question 5

Resistance welding is the process of joining two metals together by the heat produced due to the resistance offered to the flow of electric current at the junctions of two metals. The heat produced by the resistance to the flow of current is given by

H = I2R

The heat produced at the joint is proportional to I2R

Test: Utilization of Electrical Energy- 2 - Question 6

The main drawbacks of the resistance welding are:

Detailed Solution for Test: Utilization of Electrical Energy- 2 - Question 6

The main drawbacks of the resistance welding are:

  1. Initial cost is very high
  2. High maintenance cost
  3. The workpiece with heavier thickness cannot be welded, since it requires high input current
Test: Utilization of Electrical Energy- 2 - Question 7

In the spot welding:

Detailed Solution for Test: Utilization of Electrical Energy- 2 - Question 7

Spot welding means the joining of two metal sheets and fusing them together between copper electrode tips at suitably spaced intervals by means of heavy electric current passed through the electrodes.

It is desirable to clean the sheets thoroughly before welding.

The welding current varies widely depending upon the thickness of and composition of plates. It varies from 1000 to 10000 A and voltage between the electrodes is usually less than 2 V.

Test: Utilization of Electrical Energy- 2 - Question 8

The length of arc required depends on:

Detailed Solution for Test: Utilization of Electrical Energy- 2 - Question 8

The length of the arc required for welding depends upon the following factors:

1. The surface coating and the type of electrodes used

2. The position of welding      

3. The amount of current used

Test: Utilization of Electrical Energy- 2 - Question 9

A substance that changes its electrical resistance when illuminated by light is called:

Detailed Solution for Test: Utilization of Electrical Energy- 2 - Question 9

Photoconductivity is an optical and electrical phenomenon in which a material becomes more electrically conductive due to the absorption of electromagnetic radiation such as visible light, ultraviolet light, infrared light, or gamma radiation

Photovoltaic is a method for generating electric power by using solar cells to convert energy from the sun into a flow of electrons by the photovoltaic effect

Photoelectric effect is the emission of electrons or other free carriers when light shines on a material

Test: Utilization of Electrical Energy- 2 - Question 10

The illumination of various points on a horizontal surface illuminated by the same source varies as:

Detailed Solution for Test: Utilization of Electrical Energy- 2 - Question 10

The illumination of the surface is,

Where, h is the height of source from the surface in m

I is the luminous intensity on candela

The above equation is also known as cosine cube law. This law states that the illumination at any point on a surface is dependent on the cube of cosine of the angle between lines of flux and normal of that point.

Test: Utilization of Electrical Energy- 2 - Question 11

In the electric discharge lamps, the light is produced by:

Detailed Solution for Test: Utilization of Electrical Energy- 2 - Question 11

The lamps that emit light of the colour produced by discharge takes place through the gas or vapour present in the discharge tube such as neon gas, sodium vapour, mercury vapour, etc.

Test: Utilization of Electrical Energy- 2 - Question 12

An auto-transformer used with a sodium vapour lamp should have:

Detailed Solution for Test: Utilization of Electrical Energy- 2 - Question 12

To start sodium vapour lamp, 380 - 450 V of striking voltage required for 40 - 100 W lamps. These voltages can be obtained from a high reactance transformer or an auto transformer.

Test: Utilization of Electrical Energy- 2 - Question 13

Which law states that the mass of substance liberated from an electrolyte is proportional to the quantity of electricity passing through it?

Detailed Solution for Test: Utilization of Electrical Energy- 2 - Question 13

Faraday’s first law:

This law states that the mass of substance deposited from an electrolyte is proportional to the quantity of electricity passing through the electrolyte in the given time

m ∝ It

Faraday’s second law:

This law states that when the same quantity of electric current is passed through different electrolytes, the masses of the substances deposited are proportional to their respective chemical equivalents or equivalent weights.

Test: Utilization of Electrical Energy- 2 - Question 14

The process of depositing one metal over the other metal is known as:

Detailed Solution for Test: Utilization of Electrical Energy- 2 - Question 14

Electrodeposition: It is the process by which one metal is deposited over other metal or non-metal by electrolysis.

Electro metallization: It is the process by which the metal can be deposited on a conduction base for decoration and for protective purposes. Any non-conductive base is made as conductive by depositing graphite layer over it.

Anodizing: The process of deposition of oxide film on a metal surface is known as anodizing and oxidation.

Electrofacing: It is the process of the coating of a metallic surface with a harder metal by electrodeposition

Test: Utilization of Electrical Energy- 2 - Question 15

The speed-time curve for the urban service has no:

Detailed Solution for Test: Utilization of Electrical Energy- 2 - Question 15

In urban service, there is no free running period. The distance between two stops is less about 1 km. Hence relatively short coasting and longer braking period is required.

 

Test: Utilization of Electrical Energy- 2 - Question 16

The speed of a train estimated taking into account the stoppage time at a station in addition to the actual running time between stops is called the:

Detailed Solution for Test: Utilization of Electrical Energy- 2 - Question 16

Average Speed: It is the mean of the speeds attained by the train from start to stop, i.e. it is defined as the ratio of the distance covered by the train between two stops to the total time of run. It is denoted with Va

Average speed = distance between stops/actual time of run

Va = D/T

Where Vis the average speed of train in kmph

D is the distance between stops in km

T is the actual time in hours

Schedule Speed: The ratio of the distance covered between two stops to the total time of the run including the time for stop is known as schedule speed. It is denoted with Vs


Where Ts is the schedule time in hours

Test: Utilization of Electrical Energy- 2 - Question 17

The coefficient of the adhesion is the ratio of tractive effort to slip the wheels and:

Detailed Solution for Test: Utilization of Electrical Energy- 2 - Question 17

Coefficient of adhesion (μ): It is defined as the ratio of the tractive effort (Ft) to propel the wheel of a locomotive to its adhesive weight (W).

Test: Utilization of Electrical Energy- 2 - Question 18

Load equalization is desirable in the case of

Detailed Solution for Test: Utilization of Electrical Energy- 2 - Question 18

The load fluctuations take place in many of the industrial drives such as rolling mills, electric hammers, presses, and reciprocating pumps, where the load on the motor varies widely within a span of few seconds. The sudden and peak load requires very large current from the supply results high voltage drop in the system or alternately would require very large size of cables. It is very essential to smooth out fluctuating load is known as load equalization.

Test: Utilization of Electrical Energy- 2 - Question 19

Which of the following material is most commonly used for the filaments in incandescent lamps?

Detailed Solution for Test: Utilization of Electrical Energy- 2 - Question 19

Tungsten is most commonly used for the filaments in incandescent lamps.

Test: Utilization of Electrical Energy- 2 - Question 20

Centrifugal pumps are usually driven by:

Detailed Solution for Test: Utilization of Electrical Energy- 2 - Question 20

Centrifugal pumps are used to transport fluids by the conversion of rotational kinetic energy to the hydrodynamic energy of the fluid flow. The rotational energy typically comes from an engine or electric motor. Squirrel cage induction motors are used for this purpose.

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