# SSC – JE Previous Year Electrical Question Paper With Solution

**Ques 1. **The voltage wave v = Vm sin(ωt − 15°) volt is applied across an ac circuit. If the current leads the voltage by 10° and the maximum value of current is Im, then the equation of current is

- I = Im sin(ωt + 5°) amps
- I = Im sin(ωt – 25°) amps
- I = Im sin(ωt + 25°) amps
- I = Im sin(ωt – 5°) amps

**Ques 2. **The average value of current (I_{av}) of a sinusoidal wave of peak value (I_{m}) is

- Iav = I
_{m}/2 - Iav = I
_{m}x Π/2 - Iav = I
_{m}x 2/Π - Iav = I
_{m}/√2

**Ques 3. **The emf induced in a coil is given by f = -N dΦ/dt, where ‘e’ is the induced emf, N is the number of turns and dΦ’ is the instantaneous flux linkage with the coil in time ‘dt’. The negative sign of above expression is due to

- Hans Christian Oersted
- Andre-Marie Ampere
- Michael Faraday
- Emil Lenz

**Ques 4. **The mutual inductance between two coils having self-inductances 3 Henry and 12 Henry and coupling coefficient 0.85 is

- 12.75 Henry
- 5.1 Henry
- 0.425 Henry
- 1.7 Henry

**Ques 5. **The temperature coefficient of resistance of copper at 20°c is

- 0.0045/°C
- 0.0017/°C
- 0.0393 /°C
- 0.0038/°C

**Ques 6. **The load characteristics of dc shunt generator is determined by

- The voltage drop in armature resistance
- The voltage drop due to armature reaction, the voltage drop due to decreased field current and voltage drop in armature resistance
- The voltage drop due to armature reaction and voltage drop in an armature resistance
- The voltage drop due to armature reaction, the voltage drop due to decreased field current and voltage drop in armature resistance and field resistance.

**Ques 7. ** How many watt-seconds are supplied by a motor developing 2 hp (British) for 5 hours?

- 2.68452×10
^{ 7}watt-seconds - 4.476×10
^{ 5}watt-seconds - 2.646×10
^{ 7}watt-seconds - 6.3943×10
^{ 6}watt-seconds

**Ques 8. ** A 4-pole generator is running at 1200 rpm the frequency and time period of E.M.F generated in its coils are respectively.

- 50 Hz & 0.02 sec
- 40 Hz & 0.025 sec
- 300 Hz & 0.0033 sec
- 2400 Hz & 0.0260 sec

**Ques 9. **The single phase Induction Motor(IM) which does not have centrifugal switch is

- Capacitor start single phase IM
- Resistance split single phase IM
- Capacitor start capacitor run single phase IM
- Permanent capacitor run single phase IM

**Ques 10. ** When a multiplier is added to an existing voltmeter for extending its range, then its electromagnetic damping

- Remains unaffected
- Increases
- Decreases
- Changes in an amount depending on the controlling torque

Q.30 solution please

I will mail you the solution Himanshu

Ques 58. We have three resistances each of value 1 Ω, 2 Ω and 3 Ω. If all the resistances are to be connected in a circuit, how many different values of equivalent resistance are possible?

Five

Six

Seven

Eight

sir this question can be answered by if 3 resistances then the possible combinations 2^3=8.

if 4 resistances then the possible combinations 2^4=16.

just like in digital. this method applicable or not?

Actually, the number of combination depends upon the value of resistor If all three resistors are of same value then the number of combination is 4.

I was also thinking the same way, researched so many books but didn’t find any appropriate formula for this. I am trying to find the method for this but If you have any information please share with us

ok sir thank you very much