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?
Ques.2. What will be the AC generator frequency, if the generator has 30 poles at 1200 rpm speed?
- 300 Hz
- 200 Hz
- 400 Hz
- 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.
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
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
- 50 kV
- 57 kV
- 60 kV
- 100 kV
Ques.6. Find the effective Resistance across the terminals A and B
Ques.7. Which material formed a protective coating during the electroplating process –
- Zinc and Cadmium
- 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
- 1000 W
- 5686 W
- 9000 W
- 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
Ques.10. If the time of operation of a relay for unity TMS is 20 sec. the time of operation of 0.5 TMS will be in secs.?