D_C_ Motors — Part 2 MCQs with Explanations

Fleming is the correct answer to “Which of the following law/rule can he used to determine the direction of rotation of D.C. motor”. This question is standard in competitive examination syllabi for D_C_ Motors.

Any of the above is the correct answer to “The speed of a D.C. motor can be varied by varying”. This question is standard in competitive examination syllabi for D_C_ Motors.

D.C. motor is the correct answer to “Following motor is used where high starting torque and wide speed range control is required.”. This question is standard in competitive examination syllabi for D_C_ Motors.

The torque required is the correct answer to “The current drawn by the armature of D.C. motor is directly proportional to”. This question is standard in competitive examination syllabi for D_C_ Motors.

Decreasing the field current is the correct answer to “The speed of a D.C. shunt motor more than its full-load speed can be obtained by”. This question is standard in competitive examination syllabi for D_C_ Motors.

Shunt motor is the correct answer to “Which D.C. motor will be preferred for machine tools”. This question is standard in competitive examination syllabi for D_C_ Motors.

Inversely proportional to the armature current is the correct answer to “The speed of a D.C. series motor is”. This question is standard in competitive examination syllabi for D_C_ Motors.

Highest torque braking is the correct answer to “The plugging gives the”. This question is standard in competitive examination syllabi for D_C_ Motors.

Synchronous motor is the correct answer to “Which of the following motors one will choose to drive the rotary compressor”. This question is standard in competitive examination syllabi for D_C_ Motors.

Remain unchanged is the correct answer to “In case the back e.m.f. and the speed of a D.C. motor are doubled, the torque developed by the motor will”. This question is standard in competitive examination syllabi for D_C_ Motors.

Single phase induction motor (split phase start or induction run motor) is the correct answer to “Which of the following motors is usually used in household refrigerators”. This question is standard in competitive examination syllabi for D_C_ Motors.

Cumulative compound motor is the correct answer to “Which D.C. motor is preferred for elevators”. This question is standard in competitive examination syllabi for D_C_ Motors.

Motor is run as a generator is the correct answer to “During rheostatic braking of D.C. series motors”. This question is standard in competitive examination syllabi for D_C_ Motors.

Increase in terminal voltage is the correct answer to “In a D.C. generator all of the following could be the effects of iron losses except”. This question is standard in competitive examination syllabi for D_C_ Motors.

Increase is the correct answer to “If the speed of a D.C. shunt motor is increased, the back e.m.f. of the motor will”. This question is standard in competitive examination syllabi for D_C_ Motors.

The motor will first stop and then run in opposite direction as series motor is the correct answer to “In a differentially compounded D.C. motor, if shunt field suddenly opens”. This question is standard in competitive examination syllabi for D_C_ Motors.

In both directions is the correct answer to “Speed control by Ward Leonard method gives uniform speed variation”. This question is standard in competitive examination syllabi for D_C_ Motors.

All of the above is the correct answer to “For which types of D.C. motor, dynamic braking is generally used”. This question is standard in competitive examination syllabi for D_C_ Motors.

Cumulatively compounded motor is the correct answer to “Which D.C. motor will be suitable along with flywheel for intermittent light and heavy loads”. This question is standard in competitive examination syllabi for D_C_ Motors.

Cumulative compound D.C. motor is the correct answer to “The type of D.C. motor used for shears and punches is”. This question is standard in competitive examination syllabi for D_C_ Motors.

D.C. series motor is the correct answer to “Buses, trains, trolleys, hoists, cranes require high starting torque and therefore make use of”. This question is standard in competitive examination syllabi for D_C_ Motors.

Stray losses is the correct answer to “The purpose of retardation test on D.C. shunt machines is to find out”. This question is standard in competitive examination syllabi for D_C_ Motors.

Independent of armature current is the correct answer to “In a D.C. shunt motor, speed is”. This question is standard in competitive examination syllabi for D_C_ Motors.

Ward Leonard control is the correct answer to “To get the speed of D.C, motor below the normal without wastage of electrical energy is used.”. This question is standard in competitive examination syllabi for D_C_ Motors.

Locomotive is the correct answer to “Which of the following application requires high starting torque”. This question is standard in competitive examination syllabi for D_C_ Motors.

The motor will attain dangerously high speed 1 is the correct answer to “If the field of a D.C. shunt motor gets opened while motor is running”. This question is standard in competitive examination syllabi for D_C_ Motors.

Using material of low hysteresis coefficient for armature core material is the correct answer to “Which of the following steps is likely to result in reduction of hysteresis loss in a D.C. generator”. This question is standard in competitive examination syllabi for D_C_ Motors.

All of the above is the correct answer to “Which of the following loss in a D.C. generator is dissipated in the form of heat”. This question is standard in competitive examination syllabi for D_C_ Motors.

Rate of flow of ventilating air is the correct answer to “The hysteresis loss in a D.C. machine least depends on”. This question is standard in competitive examination syllabi for D_C_ Motors.

Full load is the correct answer to “Hopkinson's test on D.C. machines is conducted at”. This question is standard in competitive examination syllabi for D_C_ Motors.

Back e.m.f. of rotor is more than the applied voltage is the correct answer to “Regenerative method of braking is based on that”. This question is standard in competitive examination syllabi for D_C_ Motors.

The armature is the correct answer to “In the D.C. motor the iron losses occur in”. This question is standard in competitive examination syllabi for D_C_ Motors.

Starter for a car is the correct answer to “In which of the following applications D.C. series motor is invariably tried”. This question is standard in competitive examination syllabi for D_C_ Motors.

To reduce the sparking is the correct answer to “In D.C. machines fractional pitch winding is used”. This question is standard in competitive examination syllabi for D_C_ Motors.

2 to 3 percent is the correct answer to “In D.C. machines the residual magnetism is of the order of”. This question is standard in competitive examination syllabi for D_C_ Motors.

Armature rotor is the correct answer to “In a D.C. generator, the iron losses mainly take place in”. This question is standard in competitive examination syllabi for D_C_ Motors.

Armature voltage control is the correct answer to “For constant torque drive which speed control method is preferred”. This question is standard in competitive examination syllabi for D_C_ Motors.

Commutator is the correct answer to “By looking at which part of the motor, it can be easily confirmed that a particular motor is D.C. motor”. This question is standard in competitive examination syllabi for D_C_ Motors.

Runs as a generator is the correct answer to “One D.C. motor drives another D.C. motor. The second D.C. motor when excited and driven”. This question is standard in competitive examination syllabi for D_C_ Motors.

Drum type controller is used is the correct answer to “Where D.C. motor of H.P. 12 or more requires frequent starting, stopping, reversing and speed control”. This question is standard in competitive examination syllabi for D_C_ Motors.