Electrical Machines Objective Questions
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When pure inductive load is connected to the alternator, what is the effect of armature reaction?
Correct!
Wrong!

What is the phase difference between two windings of A.C servomotor ?
Correct!
Wrong!

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
Correct!
Wrong!

Interpoles in a DC motor must be
Correct!
Wrong!

What is/are the advantages of parallel operation of alternators?
Correct!
Wrong!

What is/are the necessary conditions for parallel operation of alternators?
Correct!
Wrong!

Two windings provided on the stator of 1phase induction motor, one main winding and the other auxiliary winding are connected
Correct!
Wrong!

In case of DC Shunt Motor electromagnetic torque developed is
Correct!
Wrong!

Breadth factor is defined as the ratio of
Correct!
Wrong!

Which of the following relation is correct?
Correct!
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Which of the following motor is suitable for frequent starting and stoppings?
Correct!
Wrong!

Voltage regulation can be determined by which of the following?
Correct!
Wrong!

To eliminate 5th harmonic in the induced voltage phase breadth should be
Correct!
Wrong!

For pure resistive load what is the armature reaction?
Correct!
Wrong!

The starting resistance of DC motor is generally
Correct!
Wrong!

The current drawn by the armature of DC motor is directly proportional to
Correct!
Wrong!

Maximum power developed is depends on
Correct!
Wrong!

Quadrature axis synchronous reactance is the ratio of
Correct!
Wrong!

Which of the following motor is not suitable for frequent starting and stopping?
Correct!
Wrong!

Which of the following voltage regulation method is accurate ?
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Wrong!

In which of the following, voltage regulation may be zero or negative
Correct!
Wrong!

DC series motors are used
Correct!
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To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be
Correct!
Wrong!

As compared to an induction motor, the air gap in a DC motor is
Correct!
Wrong!

If the excitation is critical, the power factor of the alternator is
Correct!
Wrong!

For which of the following loads, armature reaction is magnetizing in nature?
Correct!
Wrong!

Direct axis reactance is defined as the ratio of
Correct!
Wrong!

Armature reaction depends on which of the following?
Correct!
Wrong!

Which of the DC Motor use flywheel?
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In case the condition for maximum power for DC motor are established, the efficiency of the motor will be
Correct!
Wrong!
