Basic Electrical PART 2

MCQ – Basic Electrical

1. A series resonant circuit implies

§  zero PF and maximum current

§  unity PF and maximum current

§  unity PF and minimum current

§  zero PF and maximum current

2. DC generator works on the principle f

§  fleming’s lefthand rule

§  Fleming’s righthand rule

§  lenz’s law

§  none of the above

3. EMF induced in each conductor of a dc machine is

§  an alternating emf

§  a direct emf

§  pulsating emf

§  emf of random waveform

4. In large dc generators, the magnetic field is produced by

§  permanent magnet

§  electromagnet

§  either a or b

§  none of the above

5. The emf generated y a dc generator may be increased by increasing

§  speed of rotation

§  excitation

§  armature length

§  either a or b

6. If we increase field current of a dc generator, its emf output

§  increases indefinitely

§  increases till the winding burns

§  increases till the magnetic saturation takes place

§  first increases and then reducing

7. The terminal voltage of a dc shunt generator on loading

§  increases slightly

§  decreases slightly

§  decrease sharply

§  remains constant

8. The transformer action requires a

§  constant magnetic flux

§  increasing magnetic flux

§  alternating magnetic flux

§  alternating electric flux

9. The induced emf in a transformer depends on

§  frequency

§  number of turns

§  maximum value of flux

§  all of the above

10. The flux in transformer core

§   increases with load

§  decreases with load

§  remains constant irrespective of load

§  none of the above