1. . An electrical generator is a machine which converts:
(A) Electrical energy into mechanical energy
(B) Chemical energy into electrical energy
(C) Mechanical energy into electrical energy
(D) Electrical energy into chemical energy
2. . The d.c generator works on the principle of:
(A) Fleming’s rule
(B) Lenz’s law
(C) Faraday’s law
(D) Coulomb’s law
3. . Fleming’s right hand rule is used for:
(A) DC Motors
(B) DC generators
(C) Induction Motors
(D) Transformers
4. . The direction of current in a d.c. generator can be determined by:
(A) Faraday’s Law
(B) Lenz’s law
(C) Fleming’s left hand rule
(D) Fleming’s right hand rule
5. . The induced e.m.f. in a d.c generator depends upon:
(A) No. of poles
(B) All of these
(C) No. of conductors
(D) Flux per pole
6. . Armature current from the DC generator is supplied to the external circuit through:
(A) Commutator
(B) Slip rings
(C) Inter poles
(D) Armature
7. . If slip rings are used instead of commutator in a d.c. generator, then output will be:
(A) Pulsating D.C.
(B) D.C.
(C) Zero
(D) A.C
8. . A well designed d.c. generator has overall efficiency:
(A) 85%
(B) 90%
(C) 95%
(D) 99%
9. . A d.c generator can be used as:
(A) Prime mover
(B) Power pump
(C) Rectifier
(D) Rotating amplifier
10. . A basic (single or simple) loop generator consists of:
(A) 2 Poles
(B) 2 conductors (1 turn)
(C) Both (a) & (b)
(D) 4 Poles and 4 Conductors
11. . A single (or simple) loop generator has carbon brushes:
(A) Any of these
(B) 3
(C) 4
(D) 2
12. . For a lap wound d.c. generator, induced e.m.f. is given by:
(A) 𝜙 Z N P / 60
(B) 𝜙 Z N P / 120
(C) 𝜙 Z N / 60
(D) 𝜙 Z N / 120
13. . For a wave wound d.c. generator, induced e.m.f. is given by:
(A) 𝜙 Z N / 120
(B) 𝜙 Z N P / 120
(C) 𝜙 Z N P / 60
(D) 𝜙 Z N / 60
14. . A lap wound generator consists of 100 conductors, flux per pole is 0.1 Wb and induced e.m.f. is 220 volt, speed of generator will be:
(A) 1200 r.p.m.
(B) 2000 r.p.m.
(C) 1000 r.p.m.
(D) 100 r.p.m.
15. . A d.c. generator whose field winding is supplied from an independent external d.c. source is called:
(A) Separately excited d.c. generator
(B) Self excited d.c. generator
(C) Series generator
(D) Compound generator
16. . A d.c. generator whose field magnet winding is excited by itself is called:
(A) Separately excited d.c. generator
(B) Self excited d.c. generator
(C) Series generator
(D) Compound generator
17. . Field winding of separately excited d.c. generator is excited by:
(A) External d.c. source
(B) External a.c. source
(C) Both (a) & (b)
(D) current itself
18. . Field winding of self excited d.c. generator is excited by:
(A) current itself
(B) External d.c. source
(C) Both (a) & (b)
(D) External a.c. source
19. . Example(s) of self excited d.c. generator is/are:
(A) Series generator
(B) Shunt generator
(C) All of these
(D) Compound generator
20. . A generator in which the field winding is connected parallel to the armature is called:
(A) Shunt generator
(B) Series generator
(C) Differential compound generator
(D) Cumulative compound generator