| 1. | ln a D.C. generator in order to reduce sparking at brushes, the self-induced e.m.f. in the coil is neutralised by all of the following except ? | |
|
interpoles
|
||
|
dummy coils
|
||
|
compensating winding
|
||
|
shifting of axis of brushes
|
||
View Answer
Discuss in Forum
Report Question| 2. | DC generator generally preferred for charging automobile batteries is ? | |
|
series generator
|
||
|
shunt generator
|
||
|
long shunt compound generator
|
||
|
any of the above
|
||
| 3. | Armature coil is short-circuited by brushes when it lies ? | |
|
along neutral axis
|
||
|
along field axis
|
||
|
in any of the above positions
|
||
|
in none of the above positions
|
||
| 4. | A D.C. generator works on the principle of ? | |
|
Lens's law
|
||
|
Ohm's law
|
||
|
Faraday's law of electromagnetic induction
|
||
|
none of the above
|
||
| 5. | In a D.C. generator the magnetic neutral axis coincides with the geometrical neutral axis, when ? | |
|
there is no load on the generator
|
||
|
the generator runs on full load
|
||
|
the generator runs on overload
|
||
|
the generator runs on designed speed
|
||
| 6. | In a D.C. generator the critical resistance can be increased by ? | |
|
increasing is field resistance
|
||
|
decreasing its field resistance
|
||
|
increasing its speed
|
||
|
decreasing its speed
|
||
| 7. | In a D.C. generator the critical resistance refers to the resistance of ? | |
|
brushes
|
||
|
field
|
||
|
armature
|
||
|
load
|
||
| 8. | The armature core of a D.C. generator is usually made of ? | |
|
silicon steel
|
||
|
copper
|
||
|
non-ferrous material
|
||
|
cast-iron
|
||
| 9. | In a level compounded D.C. generator, full load terminal voltage is ? | |
|
negligibly low
|
||
|
equal to no-load terminal voltage
|
||
|
more than no-load terminal voltage
|
||
|
less than no-load terminal voltage
|
||
| 10. | Following DC generator will be in a position to build up without any residual magnetism in the poles ? | |
|
series generator
|
||
|
shunt generator
|
||
|
compound generator
|
||
|
self-excited generator
|
||