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Electrical Machines

Electrical Machines
It is an advisable to use auto transformer if the transformation ratio is

 0.5.
 near to 1.
 0.25.
 Greater than 1.

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Electrical Machines
DC Shunt Motor has disadvantage(s) of

 none of above.
 constant speed.
 less expensive.
 not suitable for rapidly changing loads.

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Electrical Machines
Counter emf of a DC motor

 regulates its armature voltage.
 aids applied voltage.
 exceeds supply voltage
 helps in energy conversion.

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Electrical Machines
A 220 V dc machine has an armature resistance of 1Ω.If the full-load current is 20 A, the differenc in the induced voltages when the machine is running as a motor and as a generator is

 50 V
 20 V
 40 V
 zero

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Electrical Machines
The brush-axis of a bipolar dc motor is rotated by 90°. The effect of this rotation on the back emf Eband the torque developed Tdwould be such that

 Eb is zero, but Td is unchanged
 both Eb and Td are zero
 both Eb and Td are unchanged
 Eb is unchanged, but Td is zero

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Electrical Machines
The speed regulation of a DC motor is given as

 (NfL − NnL)/NnL.
 (NnL − NfL)/NfL.
 NnL/NfL.
 NnL − NfL.

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