Electrical Engineering MCQs

Page No. 292

The armature voltage control of D.C. motor provides_____________?


aconstant voltage drive

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bconstant current drive

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cconstant torque drive

✓


dnone of the above

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View Answer constant torque drive

The plugging gives the____________?


azero torque braking

✖


bsmallest torque braking

✖


chighest torque braking

✓


dnone of the above

✖



For a D.C. shunt motor if the excitation is changed_______________?


a torque will remain constant

✖


btorque will change but power will remain constant

✓


c torque and power both will change

✖


dtorque, power and speed, all will change

✖



Which motor has the poorest speed control?


aDifferentially compounded motor

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bCumulatively compounded motor

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cShunt motor

✖


dSeries motor

✓


View Answer Series motor

If I2 be the armature current, then speed of a D.C. shunt motor is_______________?


a independent of Ia

✓


bproportional to la

✖


cvaries as (Ia)

✖


dvaries as la

✖


View Answer independent of Ia

The speed of a D.C. shunt motor can be increased by_______________?


aincreasing the resistance in armature circuit

✖


bincreasing the resistance in field circuit

✓


c reducing the resistance in the field circuit

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d reducing the resistance in the armature circuit

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As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent a heavy current from flowing though the armature circuit____________________?


aa resistance is connected in series with armature

✓


b a resistance is connected parallel to the armature

✖


carmature is temporarily open circuited

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da high value resistor is connected across the field winding

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The speed of a motor falls from 1100 r.p.m. at no-load to 1050 r.p.m. at rated load. The speed regulation of the motor is______________?


a2.36%

✖


b4.76%

✓


c6.77%

✖


d8.84%

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View Answer 4.76%

Usually wide and sensitive speed control is desired in case of____________?


acentrifugal pumps

✖


belevators

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csteel rolling mills

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dcolliery winders

✓


View Answer colliery winders

Which of the following method of speed control of D.C. machine will offer minimum efficiency ?


aVoltage control method

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bField control method

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cArmature control method

✓


dAll above methods

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