# SSC JE electrical Mock Test Paper 2019| MES Electrical

Ques.1. In a suspension insulator string, each disc insulator is designed for a low voltage of 11 kV. What is the maximum number of disc insulators required for 143 kV/phase transmission?

1. 4
2. 6
3. 12
4. 13

Ques.2. What will be the AC generator frequency, if the generator has 30 poles at 1200 rpm speed?

1. 300 Hz
2. 200 Hz
3. 400 Hz
4. 250 Hz

Ques.3. A dynamometer wattmeter with its voltage coil connected across the load side reads 192 W. The load voltage is 208 V and the resistance of the potential coil is 3825Ω.

1. 7.86%
2. 11.34%
3. 4.85%
4. 6.25%

Ques.4. A 60 Hz, 3 phase induction motor has a full load speed of 1600 r.p.m. the number of poles of the motor is

1. 4
2. 12
3. 8
4. 6

Ques.5. If the inductance and capacitance of a power system are 1 H and 0.01µF and the instantaneous value of interrupted current is 10 A, then the voltage across the breaker contacts will be

1. 50 kV
2. 57 kV
3. 60 kV
4. 100 kV

Ques.6. Find the effective Resistance across the terminals A and B

1. 11R/8
2. 5R/8
3. 2R/3
4. 7R/6

Ques.7. Which material formed a protective coating during the electroplating process –

1. Zinc
3. Copper
4. Copper and Nickel

Ques.8. The rotor power output of a 3-phase induction motor is 5 KW and corresponding slip is 5%. The rotor copper loss will be

1. 1000 W
2. 5686 W
3. 9000 W
4. 9999.05 W

Ques.9. A permanent magnet stepper motor with 8 poles in stator and 6 poles in the rotor will have a step angle of

1. 10°
2. 20
3. 15°
4. 30°