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Electrical Machines

Electrical Machines
The material used for commutator brushes is mostly

 cast iron.
 copper.
  carbon.
 mica.

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Electrical Machines
In DC machine torque depends on which of the following?

 flux (φ)
 speed
 armature current (I)
 both A and B

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Electrical Machines
A synchronous motor is supplying a load at unity power factor. If the load on the motor is increased keeping its excitation and terminal voltage constant, the power factor

 will become lagging
 will remain the same
None of these
 will become leading

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Electrical Machines
For a DC machine having P no of pair of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance?

 PZL/4Sa²
 PZL/ 4Sa
 PZL/4S
 PZL/4Sp²

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Electrical Machines
A 10KVA auto transformer, turn ratio is 0.4. Find the power transferred inductively?

 6 KVA
 10 KVA
 4 KVA
 0 KVA

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Electrical Machines
which of the following losses are negligible in blocked rotor test?

 mechanical loss
 both A and B
 iron loss
 copper loss

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