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SSC JE ELECTRICAL
ssc MCQs with answers - part-15
1. A zener diode is invariably used with ?
-forward bias
-reverse bias
-either forward bias or reverse bias
-zero bias
Answer: reverse bias
Explanation:
A zener diode is invariably used with reverse bias.
2. In a full wave rectifier diode conduct for ?
-one half cycle
-full cycle
-alternate half cycle
-None of these
Answer: alternate half cycle
Explanation:
In a full wave rectifier diode conduct for alternate half cycle.
3. Iceo is related to Icbo by ?
-Iceo = (B+ 1) Icbo
-Iceo = Icbo
-Iceo = Alpha.Icbo
-None of these
Answer: Iceo = (B+ 1) Icbo
Explanation:
Iceo is related to Icbo by Iceo = (B+ 1) Icbo
4. If the temperature increases, the value of VBE ?
-remains the same
-is increased
-is decreased
-None of these
Answer: is decreased
Explanation:
If the temperature increases, the value of VBE is decreased.
5. In case of the CE amplifier the output voltage waveform is ?
-in phase with input voltage waveform
-always lag by 90 with respect to input voltage waveform
-always lagging by 180 with respect to input voltage waveform
-always lagging by 90 with respect to input voltage waveform
Answer: always lagging by 180 with respect to input voltage waveform
Explanation:
In case of the CE amplifier the output voltage waveform is always lagging by 180 with respect to input voltage waveform.
6. In a synchronous motor the maximum power developed occurs at a coupling angle of .......... degree ?
-180
-90
-60
-30
Answer: 90
Explanation:
In a synchronous motor the maximum power developed occurs at a coupling angle of 90 degree.
7. Which of the following motors will be used in electric clocks ?
-D.C. series motor
-D.C. shunt motor
-A.C. synchronous motor
-A.C. induction motor
Answer: A.C. synchronous motor
Explanation:
A.C. synchronous motors will be used in electric clocks.
8. The power developed by a synchronous motor will be maximum when the load angle is ..... ?
-45
-90
-120
-0
Answer: 90
Explanation:
The power developed by a synchronous motor will be maximum when the load angle is 90 degree.
9. In a synchronous motor, damper windings are placed on ?
-rotor shaft
-stator frame
-pole faces
-None of these
Answer: pole faces
Explanation:
In a synchronous motor, damper windings are placed on pole faces
10. In a three-phase synchronous motor, if one of the winding is short-circuited then the motor will ?
-run at 1/4 of synchronous speed
-not start
-run with excessive vibrations
-rotate at less than the rated load
Answer: not start
Explanation:
In a three-phase synchronous motor, if one of the winding is short-circuited then the motor will not start.
