# SSC JE 2013 electrical question paper with solution | MES Electrical

**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 the 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 the 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 the dc shunt generator are 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 the 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 a centrifugal switch is

- Capacitor starts 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