A Best Way To Crack Gorenment Job Exams

Electrical Engineering Objective Questions { DC Motors }



64.  The open circuit voltage of a de compound generator is 200 V. At full load, the terminal voltage
A. will always be 200 V
B. will always be less than 200 V
C. will always be greater than 200 V
D. may be greater than or less than 200 V

65. For most of the applications
A. dc shunt generator is more popular than dc series generator
B. dc series generator is more popular than dc shund generator
C. both dc series and shunt generators are equally popular
D. dc compound generator is most popular

66. Equalizer connections are required when paralleling two
A. bipolar genearators
B. shunt generators
C. series generators
D. compound generators

67. In case of parallel operation of compound generators, for proper division of load from no load to full load, it is essential that
A. the regulation of each armature should be the same
B. their series field resistances should be equal
C. their ratings should be equal
D. none of these

68. A series generators is provided with diverter and is delivering its rated current. If the diverter switch is opened, the terminal voltage
A. will increase
B. will decrease
C. will remain the same
D. may increase or decrease

69. In Hopkinson test on two shunt machines
A. the field currents of the two machines are equal
B. the field current of the generator is more than that of motor
C. the field current of the generator is less than of motor
D. none of these

70. Critical resistance of dc generator is proportional to
A. N
B. 1/N2
C. 1/N
D. N2

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