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Electrical Machines
In a step down transformer which one of the following statements is true?
Number of secondary turns is less than primary turns.
Secondary power is less than primary power.
Number of secondary turns is more than that of primary.
Secondary current is less than primary current.
Number of secondary turns is less than primary turns.
Secondary power is less than primary power.
Number of secondary turns is more than that of primary.
Secondary current is less than primary current.
Answer
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Related Question
Electrical Machines
The oscillation in a synchronous motor can be damped out by
oscillation cannot be damped.
running the motor on leading power factors.
providing damper bars in the rotor pole faces.
maintaining constant excitation.
oscillation cannot be damped.
running the motor on leading power factors.
providing damper bars in the rotor pole faces.
maintaining constant excitation.
Answer
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Electrical Machines
Reluctance and hysteresis motors are the types of which electrical motor?
Stepper motor.
1 - Φ synchronous motor.
DC motor.
3 - Φ induction motor.
Stepper motor.
1 - Φ synchronous motor.
DC motor.
3 - Φ induction motor.
Answer
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Electrical Machines
Induction motors normally use cast aluminium rotor because aluminium is
easy to cast owing to its low melting point and is easily available.
lighter in weight.
cheaper in cost.
of low resistivity.
easy to cast owing to its low melting point and is easily available.
lighter in weight.
cheaper in cost.
of low resistivity.
Answer
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Electrical Machines
A single phase, 2 KV alternator has an armature resistance of 0.8 ohms and 4.94 ohms respectively. The voltage regulation of the alternator at 100 a load 0.8 loading power factor is
8.9%.
7%.
14%.
0%.
8.9%.
7%.
14%.
0%.
Answer
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Electrical Machines
Which of the following machines have highest power factor with respect to magnetizing current?
Any of the above.
Open slot type machines.
Closed slot type machines.
Semi closed slot type machine.
Any of the above.
Open slot type machines.
Closed slot type machines.
Semi closed slot type machine.
Answer
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