Hi friends, these are objectives on electrical engineering emphasis on dc generator check out and comment if you have any doubts......
1) An ideal dc generator has a regulation of ................. percent
A) zero
B) 10
C) 25
D) 100
Ans:A
2) In a dc generator, the voltage build up is generally restricted due to
A) armature heating
B) insulation restrictions
C) saturation of iron
D) speed limitations
Ans:C
3) The factor that is responsible for drop in terminal voltage of a dc shunt generator on load is
A) commutation
B) armature reaction
C) armature reaction drop
D) field weakening due to (b) and (c)
Ans:A
4) The voltage at the terminals of a dc series generator running at rated rpm and no load will be
A) more than the rated voltage
B) full rated voltage
C) a very small voltage
D) zero
Ans:C
5) If the field circuit resistance of a dc shunt generator exceeds its critical value, the generator
A) fails to build up
B) builds up a very high voltage
C) exceeds its current capacity
D) produces power beyond its rating
Ans:A
6) A generator may loose residual magnetism due to
A) heating
B) vibrations
C) over excitation
D) any of these
Ans:A
7) In dc generators, the residual magnetism is of the order of
A) 2.5%
B) 10%
C) 15%
D) 25%
Ans:A
8) A 4-pole 25kw 200 V wave wound dc shunt generator the current in each parallel path will be
A) 62.5 A
B) 125 A
C) 31.25 A
D) 250 A
Ans:A
9) The magnetic field which initially induces emf in the armature in a self excited dc generator is because of
A) permanent magnets
B) armature rotation
C) residual magnetism
D) none of the above
Ans:C
10) The terminal voltage of an over-compounded dc generator
A) decrease with the increase in load current
B) increase with the increase in load current
C) remains constant at all load currents
D) none of the above
Ans:B
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1) An ideal dc generator has a regulation of ................. percent
A) zero
B) 10
C) 25
D) 100
Ans:A
2) In a dc generator, the voltage build up is generally restricted due to
A) armature heating
B) insulation restrictions
C) saturation of iron
D) speed limitations
Ans:C
3) The factor that is responsible for drop in terminal voltage of a dc shunt generator on load is
A) commutation
B) armature reaction
C) armature reaction drop
D) field weakening due to (b) and (c)
Ans:A
4) The voltage at the terminals of a dc series generator running at rated rpm and no load will be
A) more than the rated voltage
B) full rated voltage
C) a very small voltage
D) zero
Ans:C
5) If the field circuit resistance of a dc shunt generator exceeds its critical value, the generator
A) fails to build up
B) builds up a very high voltage
C) exceeds its current capacity
D) produces power beyond its rating
Ans:A
6) A generator may loose residual magnetism due to
A) heating
B) vibrations
C) over excitation
D) any of these
Ans:A
7) In dc generators, the residual magnetism is of the order of
A) 2.5%
B) 10%
C) 15%
D) 25%
Ans:A
8) A 4-pole 25kw 200 V wave wound dc shunt generator the current in each parallel path will be
A) 62.5 A
B) 125 A
C) 31.25 A
D) 250 A
Ans:A
9) The magnetic field which initially induces emf in the armature in a self excited dc generator is because of
A) permanent magnets
B) armature rotation
C) residual magnetism
D) none of the above
Ans:C
10) The terminal voltage of an over-compounded dc generator
A) decrease with the increase in load current
B) increase with the increase in load current
C) remains constant at all load currents
D) none of the above
Ans:B
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