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Electrical Machines

Electrical Machines
In a transformer which of the following losses are zero?

All of these
 Copper loss
 Iron loss
 Rotational loss

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Electrical Machines
No load saturation characteristics are plotted between

 no load voltage and field current
 no load voltage and armature current
 short circuit current and armature current
 short circuit current and field current

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Electrical Machines
If Pi and Pc represent core and full load copper loss respectively, the maximum KVA delivered to load corresponding to maximum efficiency is equal to rated KVA is

 Pi/Pc
 √(Pi/Pc)
 Pc/Pi
 (Pi/Pc)2

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Electrical Machines
A transformer has maximum efficiency at 3/4 load. The ratio of iron loss and full load copper loss is

 9/16.
 16/9.
 3/4.
 4/3.

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Electrical Machines
The starting resistance of DC motor is generally

  Low.
 1000 ohms.
 Infinitely large.
 around 500 ohms.

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Electrical Machines
The efficiency of a transformer is mainly dependent on

 core losses.
 stray losses.
 dielectric losses.
 copper losses.

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