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Electrical Machines

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

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

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Electrical Machines
Which of the following represents the pitch factor?

 Cos α
 Cos α²
 sin (α/2)
 Cos (α/2)

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor copper loss?

 60W
 80W
 100W
 40W

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Electrical Machines
The direction of rotation of a DC motor can be determent by

 Flemings right hand rule.
  Flemings left hand rule.
 Amperes law.
 Lenzs law.

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Electrical Machines
In which of the following, voltage regulation may be zero or negative

All of these
 leading power factor
 unity power factor
 lagging power factor

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Electrical Machines
A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?

 0.
 1000.
 2000.
 500.

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