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Electrical Machines

Electrical Machines
An ideal DC generated is one that has _____________ voltage regulation.

 low.
 negative.
  zero.
 positive.

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Electrical Machines
To avoid formation of grooves in the commutator

 the brushes of same polarity should track each other.
None of these
  the brushes of opposite polarity should track each other.
  brush position has no effect on the commutator grooving.

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Electrical Machines
In speed control of DC shunt motor by varying field flux, what may be the value of field regulator?

 2 ohm.
 100 ohm
 0.2 ohm
 10 ohm

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Electrical Machines
Armature reaction depends on which of the following?

 power factor of load
None of these
 both 1 and 2
 magnitude of load current

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Electrical Machines
A single phase transformer has specifications as 250 KVA, 11000 V/415 V, 50 Hz. What are the values of primary and secondary currents?

 primary = 602 A, secondary = 22.7 A
 primary = 22.7 A, secondary = 602.4 A
 primary = 11.4 A, secondary = 301 A
 primary = 301 A, secondary = 22.7 A

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Electrical Machines
When R2 is rotor resistance, X2 the rotor reactance at supply frequency and s the slip, then the condition for maximum torque under running condition will be

  R2 = sX2.
  R2 = s2X2.
  R2 = s2X2.
  sR2 = X2.

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