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 seventh 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

Hopkinson’s Law related to

Magnetic Circuit

Hopkinson’s’ law is same for magnetic circuit as Ohms law for electrical circuit

2

Which of the material having negative temperature coefficient of resistance?

Carbon

The temperature coefficient of carbon at 20 degree centigrade is 5×10⁻⁴ per degree centigrade

3

Q factor of a coil is given by

ωL/R

4

A capacitor and resistor of equal impedance are connected in series and sinusoidal voltage applied. The voltage drop across each is equal but what happens when the frequency is increased?

Vc˂Vr

With frequency increased, capacitor impedance reduces and therefore voltage drop also reduces.

5

Energy stored in a capacitor is given by

½QV Joules

6

Faradays First law of electrolysis state that

the mass of ions liberated at an electrode is directly proportional to the quantity of electricity passes through the electrolyte

7

Power in a AC circuit is given by VICosφ where V is voltage, I is current and φ is the phase angle between voltage and current, the value of V and I in this equation is

rms value

The power in a AC circuit is actually ½*Vm*Im*pF which becomes (Vm/√2)(Im/√2)pF; and Vm/√2 is rms value

8

The motor which is not used for railway traction application is

Slip ring three phase induction motor

Slip ring induction motor is used where starting torque is high but speed control is not required

9

Guard rings in a transmission line are provided to

to equalize the capacitance of each unit of the string

10

The material used for armouring of single core cable is of

Aluminium

Non-magnetic material is necessary to avoid electro-magnetic induction induced emf and flow of current

11

Speed of an diesel-electric locomotive is controlled by

varying the voltage and frequency of applied power supply

Fuel injection variation is deliver more power to the motor system and there is one gear reduction instead multiple gear reduction in automobiles. All of them is to create confusion in the mind of candidates

12

IGBT drives has the advantage over GTO for

All of them

13

In a transmission line, what happens to the sag if the span is doubled?

will become eight times

14

Which is not a condition necessary for parallel operation of transformer

Identical MVA ratio

15

What is Bucholz relay?

Protection of oil filled Transformer

16

A complex function is given by i=14Sinwt+2Sin5wt; what is the rms value of current

10

Irms=√(14²+2²)/2=10

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Review

Question 1 of 16

1. Question

A complex function is given by i=14Sinwt+2Sin5wt; what is the rms value of current

Question 2 of 16

2. Question

Energy stored in a capacitor is given by

Question 3 of 16

3. Question

Hopkinson’s Law related to

Question 4 of 16

4. Question

Which of the material having negative temperature coefficient of resistance?

Question 5 of 16

5. Question

Q factor of a coil is given by

Question 6 of 16

6. Question

A capacitor and resistor of equal impedance are connected in series and sinusoidal voltage applied. The voltage drop across each is equal but what happens when the frequency is increased?

Question 7 of 16

7. Question

Faradays First law of electrolysis state that

Question 8 of 16

8. Question

Power in a AC circuit is given by VICos_ where V is voltage, I is current and _ is the phase angle between voltage and current, the value of V and I in this equation is

Question 9 of 16

9. Question

The motor which is not used for railway traction application is

Question 10 of 16

10. Question

Guard rings in a transmission line are provided to

Question 11 of 16

11. Question

The material used for armouring of single core cable is of

Question 12 of 16

12. Question

Speed of an diesel-electric locomotive is controlled by

Question 13 of 16

13. Question

IGBT drives has the advantage over GTO for

Question 14 of 16

14. Question

In a transmission line, what happens to the sag if the span is doubled?

Question 15 of 16

15. Question

Which is not a condition necessary for parallel operation of transformer