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 ninth 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

Lumen Efficiency is defined as

Ampere

2

Increase in the resistance of a material due to increase in temperature is directly proportional to

V/I

Rt-R0=R0*α*δT

3

The current at any instant in an capacitor when connected to a DC source is given by

lag the voltage applied

4

n number of resistances of each r ohms when connected in parallel found to have R ohms; what will be its value when connected in series

sum of voltage drops and battery emf in a closed loop is zero

When n resistances of value r are connected in parallel than R=r/n; and each will have a value of nR. This resistance when connected in series , the net value of n*nR=n²R

5

A parallel plate capacitor is charged to 24 V and its plate separation is 2 mm and area of each plate is 150 cm², what happens to its capacitance, if the plate separation is reduced to 1 mm?

I*R*t

C = ε*Area/distance between two plates;

6

The battery used in this system is generally on float charge

PbO2 to PbSO4

The system comes into service only when there is a power supply failure which is very rare and generally the battery system remains on float charge

7

A RLC circuit is said to be at resonance when

270

Xc=Xl; resonant circuit is only resistive

8

What will be torque produced at 6% slip if the maximum torque produced is 200 Kg-m at 12% slip?

increase in speed

9

A transmission line string insulator has 10 discs. What is the transmission voltage?

3-33kV

10

The inductance per km of a 11 kV distribution line is

high cost

11

Area of trapezoidal curve depiction motion of a train from start to stop depicts

MIG

12

Dielectric heating is by the transfer of energy

doping

Micro-wave uses the principle of dielectric heating

13

A perfect black body is one which

30 kV/cm

14

Increase in flux density in the transformer helps in

Torque

15

Impedance protection is same as distance relay and works on the principle of measuring

Moulded Case Circuit Breaker

Distance protection detects both voltage and current. A fault on a circuit will generally create a sag in the voltage level. If the ratio of voltage to current measured at the relay terminals, which equates to an impedance, lands within a predetermined level the circuit breaker will operate.

16

A 200 mH inductor is connected across a supply for 100 V AC. For which of the following frequency the circuit will have highest rms current?

9 times

Xl=2π*f*L and therefore, the Xl is minimum for minimum frequency

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Answered

Review

Question 1 of 16

1. Question

Area of trapezoidal curve depiction motion of a train from start to stop depicts

Question 2 of 16

2. Question

A 200 mHÊinductorÊis connected across a supply for 100 V AC. For which of the following frequency the circuit will have highest rms current?

Question 3 of 16

3. Question

n number of resistances of each r ohms when connected in parallel found to have R ohms; what will be its value when connected in series

Question 4 of 16

4. Question

Lumen Efficiency is defined as

Question 5 of 16

5. Question

Increase in the resistance of a material due to increase in temperature is directly proportional to

Question 6 of 16

6. Question

The current at any instant in an capacitor when connected to a DC source is given by

Question 7 of 16

7. Question

A parallel plate capacitor is charged to 24 V and its plate separation is 2 mm and area of each plate is 150 cm_, what happens to its capacitance, if the plate separation is reduced to 1 mm?

Question 8 of 16

8. Question

The battery used in this system is generally on float charge

Question 9 of 16

9. Question

A RLC circuit is said to be at resonance when

Question 10 of 16

10. Question

What will be torque produced at 6% slip if the maximum torque produced is 200 Kg-m at 12% slip?

Question 11 of 16

11. Question

A transmission line string insulator has 10 discs. What is the transmission voltage?

Question 12 of 16

12. Question

The inductance per km of a 11 kV distribution line is

Question 13 of 16

13. Question

Dielectric heating is by the transfer of energy

Question 14 of 16

14. Question

A perfect black body is one which

Question 15 of 16

15. Question

Increase in flux density in the transformer helps in

Question 16 of 16

16. Question

Impedance protection is same as distance relay and works on the principle of measuring

sir, i am having problem with the answers given, some of them r not even present in the options :(.

May i request to given the question where the problem is found so that I can correct it. There is some software problems.