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Electrical Machines

Electrical Machines
The current drawn by the a 230 V DC motor of armature resistance 0.5 Ω and back emf 200 V is

 600
 40
 660
 60

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Electrical Machines
Normally for the design of transformer the ambient temperature is taken as

  45°C.
 35°C.
 27°C.
 32°C.

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Electrical Machines
A shaded pole single phase induction motor can be used for

 food mixers
 wet grinders
 tape recorders
 personal computers as cooling fan

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Electrical Machines
High inrush of current during a starting of DC motor can efficiently be restricted to a safer value by increasing the _________________ resistance.

 both A and B
 shunt field
 armature circuit
 none of above

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Electrical Machines
For P pole machine relation between electrical degrees and mechanical degrees is

 θelec = θmech
 θelec = P/2*θmech
 θelec = 2/P*θmech
 θelec = 4/P*θmech

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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
 2, 3, 4, 5
 1, 2, 3
 2, 3 ,5

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MORE MCQ ON Electrical Machines

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