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Electrical Machines

Electrical Machines
Number of slip rings in 3-phase synchronous motor will be

 3 or 4
 0
 2
 1

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Electrical Machines
In which of the following generators negative voltage regulation can occur?

 shunt generator
 over compound generator
 both B and C
 series generators

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Electrical Machines
If the speed of a dc motor increases with load torque, then it is a

 differentially compounded motor
 comulatively compounded motor
 series motor
 permanent magnet motor

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Electrical Machines
A 240 V DC series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 ohms. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 6 ohms.
 1.9 ohms.
 2.2 ohms.
 5.7 ohms.

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Electrical Machines
A single phase transformer has specifications as 250 KVA, 11000 V/415 V, 50 Hz. What are the values of primary and secondary currents?

 primary = 11.4 A, secondary = 301 A
 primary = 301 A, secondary = 22.7 A
 primary = 22.7 A, secondary = 602.4 A
 primary = 602 A, secondary = 22.7 A

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Electrical Machines
Which of the following statement is true for an AC synchronous motor?

 It is a variable speed motor.
  It is a constant speed motor.
 It is a high reluctance motor.
 It is a step angled motor.

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