Electrical Machines Objective Questions – Set 6

Armature reaction depends on which of the following?

Direct axis reactance is defined as the ratio of

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

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

Which of the following voltage regulation method is accurate ?

In case of DC Shunt Motor electromagnetic torque developed is

Which of the following relation is correct?

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

Quadrature axis synchronous reactance is the ratio of

To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be

Interpoles in a DC motor must be

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

Which of the DC Motor use flywheel?

The starting resistance of DC motor is generally

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

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

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

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

DC series motors are used

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

Maximum power developed is depends on

For pure resistive load what is the armature reaction?

What is/are the advantages of parallel operation of alternators?

Voltage regulation can be determined by which of the following?

In case the condition for maximum power for DC motor are established, the efficiency of the motor will be

When pure inductive load is connected to the alternator, what is the effect of armature reaction?

Breadth factor is defined as the ratio of

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

Which of the following motor is suitable for frequent starting and stoppings?

If the excitation is critical, the power factor of the alternator is