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Electrical Machines

Electrical Machines
Normally for the design of transformer the ambient temperature is taken as

 35°C.
 32°C.
  45°C.
 27°C.

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Electrical Machines
The power factor of squirrel cage induction motor is

 low at heavy loads only
 low at light loads only
 both A and B
 low at rated load only

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Electrical Machines
Maximum power developed by a synchronous motor depends on

 supply voltage and load angle
 supply voltage, load angle and excitation
 excitation and load angle
 supply voltage and excitation

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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

 3.1 Ω
 2 .1 Ω
 1.79 Ω
 1.8 9 Ω

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Electrical Machines
Series generators are used in which of the following applications?

All of these
 Used as boosters in dc distribution or transmission.
 Air crafts.
 Arc welding.

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Electrical Machines
The basic function of a transformer is to change

 the frequency
 the power level
 the power factor
 the level of the voltage

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