Power Generator

141. The rotor of a turbo alternator is made cylindrical in order to reduce

1. eddy current loss
2. wind age loss
3. hysteresis loss
4. copper loss

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142. The running speed of a dc series motor is basically determined by

1. field excitation
2. armature resistance
3. load
4. applied voltage

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143. The salient pole construction for field structure of an alternator is generally used for ___________ machine

1. 2 pole
2. 8 pole
3. 4 pole
4. 6 pole

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144. The shaft torque in a dc motor is less than total armature torque because ___________ of in the motor

1. copper losses
2. iron and friction losses
3. field losses
4. hysteresis loss

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145. The size of a dc generator can be reduced by using

1. lap winding
2. high resistance winding material
3. iron commutator
4. magnetic material of high permeability

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146. The speed at which a 6 pole alternator should be drive to generate 50 cycles per second is

1. 1500rpm
2. 500rpm
3. 1000rpm
4. 1200rpm

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147. The speed of a ___________ motor is practically constant

1. commutatively compounded
2. differentially compounded
3. series
4. shunt

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148. The speed of a dc motor is

1. directly proportional to flux per pole
2. inversely proportional to flux per pole
3. inversely proportional to applied voltage
4. inversely proportional to armature current

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149. The stator of an alternator is identical to that of a

1. dc generator
2. 1 phase induction motor
3. 3 phase induction motor
4. Rosenberg generator

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150. The stator of n alternator is wound for ___________ on the rotor

1. a more number of poles than
2. the same number of poles as
3. less number of poles than
4. twice the number of poles

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