| 1. | A zener diode is invariably used with ? | |
|
forward bias
|
||
|
reverse bias
|
||
|
either forward bias or reverse bias
|
||
|
zero bias
|
||
View Answer
Discuss in Forum
Report Question| 2. | In a full wave rectifier diode conduct for ? | |
|
one half cycle
|
||
|
full cycle
|
||
|
alternate half cycle
|
||
|
None of these
|
||
| 3. | Iceo is related to Icbo by ? | |
|
Iceo = (B+ 1) Icbo
|
||
|
Iceo = Icbo
|
||
|
Iceo = Alpha.Icbo
|
||
|
None of these
|
||
| 4. | If the temperature increases, the value of VBE ? | |
|
remains the same
|
||
|
is increased
|
||
|
is decreased
|
||
|
None of these
|
||
| 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
|
||
| 6. | In a synchronous motor the maximum power developed occurs at a coupling angle of .......... degree ? | |
|
180
|
||
|
90
|
||
|
60
|
||
|
30
|
||
| 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
|
||
| 8. | The power developed by a synchronous motor will be maximum when the load angle is ..... ? | |
|
45
|
||
|
90
|
||
|
120
|
||
|
0
|
||
| 9. | In a synchronous motor, damper windings are placed on ? | |
|
rotor shaft
|
||
|
stator frame
|
||
|
pole faces
|
||
|
None of these
|
||
| 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
|
||