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Electrical Machines

Electrical Machines
Which type of motors are preferred in lifts?

 DC shunt motors.
None of these
 DC compound motors.
 DC series motors.

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Electrical Machines
DC series motor is best suited for electric traction as

 It is cheaper in cost.
  It develops high starting torque.
 It runs at very high speed at light load.
 It consume less power.

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Electrical Machines
Hunting in a synchronous cannot be due to

  variable supply voltage.
  variable load.
  variable frequency.
  windage friction.

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Electrical Machines
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

 2 .1 Ω
 1.79 Ω
 3.1 Ω
 1.8 9 Ω

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Electrical Machines
In a transformer, the frequency of a voltage at the secondary is

 any of the above.
 greater than the primary.
 equal to primary.
 less than primary.

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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
 supply frequency
None of these
 rotor resistance

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