There are 16 questions to be attended in 20 minutes. The questions are on Electrical Engineering. Read the study material before making an attempt so that you build your confidence in the subject. This is the fourth of the series of 10 questions paper that will appear before the RRB examination for SSE and JE to be held in Dec.

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There are 16 questions to be attended in 20 minutes. The questions are on Electrical Engineering. Read the study material before making an attempt so that you build your confidence in the subject. This is the first of the series of 10 questions paper that will appear before the RRB examination for SSE and JE to be held in Dec.

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The Answer Key:

Sr No

Question

Answer

Remarks

1

Ampere-second is the unit of

Charge

I=Q/t; I*t=Q i.e. ampere-sec is the unit of charge

2

Resistivity of this material is least as compared to others

Silver

3

The impedance offered by an inductor of inductance L at frequency f is given by

2πf*L

4

Thermo-couple works on the principle of

Any junction of dissimilar metals will have its resistance change in proportion to the change in temperature

5

How much energy is required to raise a lift with load of 5 tonne through a distance of 30 meter assuming 25% losses in motor and gear mechanism. Assume g=10 m/sec²

0.5 units

Work done by the lift = Wh = mgh = 5*1000*10*36 = 1.8×10⁶ J; 1kWh = 1000x(J/sec)*3600 = 36×10⁵; From this we get 1.8×10⁶/36×10⁵ = 0.5 kWh

6

The capacity of battery reduces with

reduce in temperature

7

What current will flow through a source having an impedance of 28/-32° and applied with a voltage source of 140/20°?

5/52°

Simple property of division in polar form where denominator angle is subtracted from numerator angle and magnitude is divisible as normal

8

An induction motor running at a slip of s, will deliver power at shaft in reference to air gap power given is given by a formula

(1-s²)Pg

sPg will be the rotor losses and balance will be shaft power

9

Corona discharge in high voltage transmission life is the effect of

electro static discharge

10

What is the approximate ratio of crossectional area of Aluminium and Copper Cable for the same current carrying capacity

1.6

11

A mercury vapour lamp emits light which appears to human eyes

bluish

12

IGBT stands for

insulated gate bio-polar transistor

13

The protection against lightening on transmission line is provided by

ground wire running on top of transmission line

ground wire running on top of transmission line and Surge arresters are used for the protection of transmission lines from lightening

14

No load current of a transformer is equal to

vector sum of iron loss current and magnetizing current

There are two portion of current for losses which active and another reactive to magnetizing field which is the main current lagging with the voltage.

15

Why one of the pin of a three pin plug is longer than other two?

Earth terminal of the plug should connect the socket earth first

The question is for a longer terminal and necessity is for eath to make first connection. In case there is a fault in the appliance, the same will first get earthed.

16

Two resistance of 3 ohms and R ohms are connected in series with a voltage source of 14 V. What is the value of R if the power loss across R is 16W

4

The current flowing is 14/(3+R); 16= 14*14*R/(3+R)² and by solving we get R=4,9/4

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Answered

Review

Question 1 of 16

1. Question

Ampere-second is the unit of

Question 2 of 16

2. Question

Resistivity of this material is least as compared to others

Question 3 of 16

3. Question

The impedance offered by an inductor of inductance L at frequency f is given by

Question 4 of 16

4. Question

Thermo-couple works on the principle of

Question 5 of 16

5. Question

How much energy is required to raise a lift with load of 5 tonne through a distance of 30 meter assuming 25% losses in motor and gear mechanism. Assume g=10 m/sec_

Question 6 of 16

6. Question

The capacity of battery reduces with

Question 7 of 16

7. Question

What current will flow through a source having an impedance of 28/-32 degree and applied with a voltage source of 140/20degree?

Question 8 of 16

8. Question

An induction motor running at a slip of s, will deliver power at shaft in reference to air gap power given is given by a formula

Question 9 of 16

9. Question

Corona discharge in high voltage transmission life is the effect of

Question 10 of 16

10. Question

What is the approximate ratio of crossectional area of Aluminium and Copper Cable for the same current carrying capacity

Question 11 of 16

11. Question

A mercury vapour lamp emits light which appears to human eyes

Question 12 of 16

12. Question

IGBT stands for

Question 13 of 16

13. Question

The protection against lightening on transmission line is provided by

Question 14 of 16

14. Question

No load current of a transformer is equal to

Question 15 of 16

15. Question

Why one of the pin of a three pin plug is longer than other two?

Question 16 of 16

16. Question

Two resistance of 3 ohms and R ohms are connected in series with a voltage source of 14 V. What is the value of R if the power loss across R is 16W