A. slots
B. armature conductors
C. winding elements
D. poles
A. any even number of conductors
B. any odd number of conductors
C. that even number which is exact multiple of poles + 2
D. that even number which is exact multiple of poles
Wave winding is composed of_______________? Read More »
D.C. Generators A. 2
B. 4
C. 6
D. 8
A. external resistance = internal char-acteristic – armature reaction
B. internal characteristic = magnetisation characteristic – ohmic drop
C. external characteristic = magnetisation characteristic – ohmic drop – armature reaction
D. magnetisation characteristic = external characteristic
In a D.C. generator:___________________? Read More »
D.C. Generators A. increasing its field resistance
B. decreasing its field resistance
C. increasing its speed
D. decreasing its speed
In a D.C. generator the critical resistance can be increased by_____________? Read More »
D.C. Generators A. Series generator
B. Shunt generator
C. Over compound generator
D. Flat compound generator
Which generator would you prefer for feeding long D.C. transmission lines ? Read More »
D.C. Generators A. Series field
B. Compensating field
C. Inter pole field
D. Shunt field
A. demagnetisation of leading pole tip and magnetisation of trailing pole tip
B. demagnetisation of trailing pole tip and magnetisation of leading pole tip
C. damagnetising the center of all poles
D. magnetising the center of all poles
Armature reaction in a generator results in_____________? Read More »
D.C. Generators A. zero
B. small
C. the same as rated voltage
D. high
A. to reduce eddy current losses
B. to enhance flux density
C. to amplify voltage
D. to provide mechanical balance for the rotor
The purpose of providing dummy coils in a generator is__________________? Read More »
D.C. Generators