| 1. | Direction of rotation of a coil in electric motor is determined by ? | |
|
faraday law of electromagnetic inductors
|
||
|
fleming’s right hand rule
|
||
|
fleming’s left hand rule
|
||
|
None of above
|
||
View Answer
Discuss in Forum
Report Question| 2. | Which device produces the electric current ? | |
|
motor
|
||
|
generator
|
||
|
ammeter
|
||
|
galvanometer
|
||
| 3. | An electric generator actually acts as ? | |
|
a converter of energy.
|
||
|
an electromagnet.
|
||
|
a source of neat energy.
|
||
|
a source of electric charge.
|
||
| 4. | To convert an ac generator into dc generator ? | |
|
A rectangular wire loop has to be used
|
||
|
Split-ring type commutator must be used
|
||
|
A stronger magnetic field has to be used
|
||
|
Slip rings and brushes must be used
|
||
| 5. | In Fleming’s right hand rule direction in induced current is given by ? | |
|
first finger
|
||
|
thumb
|
||
|
middle finger
|
||
|
none of these
|
||
| 6. | The frequency of direct current (DC) is ? | |
|
100 Hz
|
||
|
60 Hz
|
||
|
50 Hz
|
||
|
0 Hz
|
||
| 7. | AC generator works on the principle of ? | |
|
Joule’s law of heating
|
||
|
faraday’s law of electromagnetic induction.
|
||
|
none of the above
|
||
|
ohms law
|
||
| 8. | The magnetic field lines produced by a bar magnet ? | |
|
Originate from the south pole and end at its west pole
|
||
|
Originate from the north pole and end at its south pole
|
||
|
Originate from the north pole and end at its east pole
|
||
|
Originate from the south pole and end at its north pole
|
||
| 9. | The direction of induced current is given by ? | |
|
Left hand thumb rule.
|
||
|
Right hand thumb rule.
|
||
|
Fleming’s right hand rule.
|
||
|
Fleming’s left hand rule.
|
||
| 10. | Material of the core of a strong magnet is ? | |
|
steel
|
||
|
copper
|
||
|
soft iron
|
||
|
aluminium
|
||