# SSC JE Electrical MCQ

### 1. The voltage wave v = Vm sin (wt – 15°) volts is applied across an AC circuit. If the current leads the voltage by 10° and the maximum value of currents is Im, then the equation of current is

(a) i = Im sin (wt + 5°) amps
(b) i = Im sin (wt – 25°) amps
(c) i = Im sin (wt + 25°) amps
(d) i = Im sin (wt – 5°) amps

(a) 0.0045/°C
(b) 0.0017/°C
(c) 0.00393/°C
(d) 0.0038/°C

### 6. The load characteristic of DC shunt generator is determined by

(a) the voltage drop in armature resistance
(b) the voltage drop due to armature reaction, voltage drop due to decreased field current and voltage drop in armature resistance
(c) the voltage drop to armature reaction and voltage drop in armature resistance
(d) the voltage drop due to armature reaction, voltage drop due to decreased field current and voltage drops in armature and field resistance

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

(a) 2.6856 × 107watt-seconds
(b) 4.476 × 105watt-seconds
(c) 2.646 × 107watt-seconds
(d) 6.3943 × 106watt-seconds

### 8. A 4-pole generator is running at 1200 rpm. The frequency and time period of the emf generated in its coils respectively

(a) 50 Hz, 0.02 sec
(b) 40 Hz, 0.025 sec
(c) 300 Hz, 0.00333 sec
(d) 2400 Hz, 1/2400 sec

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

(a) capacitor start single phase IM
(b) resistance split single phase IM
(c) capacitor start capacitor run single phase IM
(d) permanent capacitor run single phase IM

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

(a) remains unaffected
(b) increases
(c) decreases
(d) changes by an amount depending on the controlling torque

### 12. Two parallel conductors carrying current in opposite directions will exert on each other

(a) an attractive forces
(b) a repulsive force
(c) an axial force
(d) no force

(a) AT/m
(b) Weber/m
(c) AT/Weber
(d) Weber/AT

### 14. In indicating instruments the springs are mainly used to

(a) conduct the current to the coils
(b) hold the pivot in position
(c) control the pointer movement
(d) reduce the vibration of the pointer

(a) 33.33
(b) 50
(c) 66.67
(d) 75

(a) 20.0 V
(b) 2.0 V
(c) 0.2 V
(d) 0.02 V

### 17. In reference to the figure, the voltage waveform v(t) is measured by a PMMC, a PMMC combined with bridge rectifier and a moving iron (MI) instrument. Two lists are prepared thereafter . The correct option relation the instruments and their reading is

(a) a-i, b-ii, c-iii
(b) a-iii, b-ii, c-i
(c) a-ii, b-iii, c-i
(d) a-iii, b-i, c-ii

(a) 20 ms
(b) 6.4 ms
(c) 12.8 ms
(d) 16 ms

### 19. A ammeter of resistance Rm is placed an arrangement as shown in the figure. Material of Rm, Rsh is copper whereas that of Rs, Rx is manganin. The condition for which the meter performance is compensated against temperature, is

(a) 1/Rm + 1/Rsh + = 1/Rs + 1/Rx
(b) Rm Rs = Rsh Rx
(c) Rm + Rs = Rsh  + Rx
(d) Rm //Rs = Rsh + Rs

(a) 0 V
(b) 110 √2 V
(c) 78V
(d) 55V