Electrical Machines Objective Questions
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DC series motors are used
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What is/are the advantages of parallel operation of alternators?
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Two windings provided on the stator of 1phase induction motor, one main winding and the other auxiliary winding are connected
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For pure resistive load what is the armature reaction?
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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
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In which of the following, voltage regulation may be zero or negative
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Which of the following voltage regulation method is accurate ?
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Which of the following motor is not suitable for frequent starting and stopping?
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Maximum power developed is depends on
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In case of DC Shunt Motor electromagnetic torque developed is
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What is the phase difference between two windings of A.C servomotor ?
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The current drawn by the armature of DC motor is directly proportional to
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In case the condition for maximum power for DC motor are established, the efficiency of the motor will be
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For which of the following loads, armature reaction is magnetizing in nature?
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Which of the following relation is correct?
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Breadth factor is defined as the ratio of
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When pure inductive load is connected to the alternator, what is the effect of armature reaction?
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What is/are the necessary conditions for parallel operation of alternators?
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To eliminate 5th harmonic in the induced voltage phase breadth should be
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Armature reaction depends on which of the following?
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Direct axis reactance is defined as the ratio of
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If the excitation is critical, the power factor of the alternator is
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Which of the DC Motor use flywheel?
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Voltage regulation can be determined by which of the following?
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The starting resistance of DC motor is generally
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Which of the following motor is suitable for frequent starting and stoppings?
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Quadrature axis synchronous reactance is the ratio of
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Interpoles in a DC motor must be
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As compared to an induction motor, the air gap in a DC motor is
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To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be
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