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Electrical Machines

Electrical Machines
At stand still condition the value of slip is

 finite value
 1
 infinite value
 0

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Electrical Machines
A large series motor is never started without some mechanical on it because otherwise it will

 Produce sparking at brushes.
 Open fuse or circuit breaker.
  Develop excessive speed and damage itself.
 Draw too much current.

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Electrical Machines
Torque developed in the rotor is

 directly proportional to slip
 either of these
 not dependent on the slip
 inversely proportional to slip

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Electrical Machines
Commutators in DC machines have a role of which converts

 none of these.
 Both AC to DC and DC to AC.
 high voltage DC to low voltage DC.
 AC to DC.

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Electrical Machines
When two DC series motors are connected in parallel, the resultant speed is

 normal speed.
 less than normal speed.
 zero.
 more than normal speed.

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Electrical Machines
A DC series motor must started on no load because it would

 Draw more current without producing sufficient torque.
  Run at dangerously high speed.
 Not develop starting torque.
 Fail to start without load.

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