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Electrical Machines

Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 0 V
 2 V
 4 V
 1 V

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Electrical Machines
A commutator in DC machines can 1. provide half-wave rectification 2. Provide full-wave rectification 3. convert ac to dc 4. Convert dc to ac 5. provide controlled full-wave rectification From these, the correct answer is

 2, 3, 4
 1, 2, 3
 2, 3 ,5
 2, 3, 4, 5

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Electrical Machines
To increase starting torque of a 3-phase slip ring induction motor, preferred method is to increase

 supply voltage
None of these
 supply frequency
 rotor resistance

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Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

 torque.
 speed.
 power.
 current.

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Electrical Machines
Which of the following machines have highest power factor with respect to magnetizing current?

 Open slot type machines.
 Semi closed slot type machine.
 Closed slot type machines.
 Any of the above.

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Electrical Machines
A dc shunt generator has full-load voltage regulation of 10% at rated speed of 1000 rpm. If it is now driven at 1250 rpm, then its voltage regulation at full load would

 be 12.5%
 be less than 10%
 remain unchanged
 be more than 10%

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