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Electrical Machines

Electrical Machines
Hopkinss test in DC motor is conducted at ?

  Full load.
 Low load.
 No load.
 None of these.

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Electrical Machines
The leakage reactance of a 3-phase alternator is determined by performing

 open circuit and zero power factor tests.
 short circuit and slip tests.
 zero power factor and slip tests.
 open circuit and short circuit tests.

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Electrical Machines
If the handle of a three point starter goes to back to OFF position, it may be due to

 over load.
 zero or very low voltage supply.
 high filed circuit resistance.
 all of these.

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Electrical Machines
Slip test is performed to determine

 slip
 positive sequence reactance and negative sequence reactance
 direct axis reactance and quadrature axis reactance
All of these

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Electrical Machines
A 8-pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm. The induced armature voltage is

 384 V
 768 V
 192 V
 96 V

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Electrical Machines
There are two 2-pole DC machines. Main field axis of machine A is horizontal and that of B is vertical. It is preferable to purchase

 none of these
 machine B
 any of the two machines
 machine A

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