Hi friends, these are objectives on electrical engineering emphasis on dc generator check out and comment if you have any doubts......
1) The residual magnetism of a dc shunt generator can be regained by
A) connecting the shunt field to a battery
B) running the generator on no-load for some time
C) grounding the shunt field
D) reversing the direction of rotation of the generator
Ans:A
2) If field of one of the two generators operating in parallel is made very weak, then it will
A) not taken any load
B) take major share of load
C) operate as a motor and run in the same direction
D) operate as a motor and run in the opposite direction
Ans:C
3) For parallel operation the dc generator normally preferred are
A) shunt
B) series
C) over-compound
D) under compound
E) both shunt and under compound
Ans:E
4) The main factor that leads to unstable parallel operation of flat or over compounded dc generators is
A) their rising voltage characteristics
B) unequal series field resistances
C) unequal speed regulation of their prime-movers
D) their drooping voltage characteristics
Ans:A
5) The type of dc generator used for arc welding purposes is a
A) series generator
B) shunt generator
C) cumulatively compounded generator
D) differentially compounded generator
Ans:D
6) In parallel operation of two dc compound generators provided with interpoles, the equalizing bar must be connected to
A) inter poles fields only
B) series fields only
C) junction of series and inter pole fields
D) none of the above
Ans:C
7) Equalizer bar is necessary for parallel operation of dc ...................generator
A) series
B) shunt
C) over compound
D) under compound
E) series and under compound
Ans:E
8) Flashing of field of dc generator means
A) neutralization of residual magnetism
B) creation of residual magnetism by a dc source
C) increasing flux density by providing extra ampere-turns in field
D) none of the above
Ans:B
9) DC generators are connected to or disconnected from the busbar only under the floating condition. This is done to avoid
A) burning of switch contacts
B) sudden loading of the prime mover
C) mechanical jerk to the shaft
D) all of the above
Ans:D
10) The simplest way of shifting load from one shunt generator to the other operating in parallel is by
A) adjustment of speeds
B) adjustment of armature resistances
C) adjustment of field rheostats
D) using equalizer connections
Ans:C
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1) The residual magnetism of a dc shunt generator can be regained by
A) connecting the shunt field to a battery
B) running the generator on no-load for some time
C) grounding the shunt field
D) reversing the direction of rotation of the generator
Ans:A
2) If field of one of the two generators operating in parallel is made very weak, then it will
A) not taken any load
B) take major share of load
C) operate as a motor and run in the same direction
D) operate as a motor and run in the opposite direction
Ans:C
3) For parallel operation the dc generator normally preferred are
A) shunt
B) series
C) over-compound
D) under compound
E) both shunt and under compound
Ans:E
4) The main factor that leads to unstable parallel operation of flat or over compounded dc generators is
A) their rising voltage characteristics
B) unequal series field resistances
C) unequal speed regulation of their prime-movers
D) their drooping voltage characteristics
Ans:A
5) The type of dc generator used for arc welding purposes is a
A) series generator
B) shunt generator
C) cumulatively compounded generator
D) differentially compounded generator
Ans:D
6) In parallel operation of two dc compound generators provided with interpoles, the equalizing bar must be connected to
A) inter poles fields only
B) series fields only
C) junction of series and inter pole fields
D) none of the above
Ans:C
7) Equalizer bar is necessary for parallel operation of dc ...................generator
A) series
B) shunt
C) over compound
D) under compound
E) series and under compound
Ans:E
8) Flashing of field of dc generator means
A) neutralization of residual magnetism
B) creation of residual magnetism by a dc source
C) increasing flux density by providing extra ampere-turns in field
D) none of the above
Ans:B
9) DC generators are connected to or disconnected from the busbar only under the floating condition. This is done to avoid
A) burning of switch contacts
B) sudden loading of the prime mover
C) mechanical jerk to the shaft
D) all of the above
Ans:D
10) The simplest way of shifting load from one shunt generator to the other operating in parallel is by
A) adjustment of speeds
B) adjustment of armature resistances
C) adjustment of field rheostats
D) using equalizer connections
Ans:C
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