Easy DC Motors Questions – Electrical Engineering (Page 9)

#161📘 EE Pocket Reviewer RojasEasy

What type of motor is used in a vacuum cleaner?

ASingle-phase series motor

BCapacitor start motor

CResistance split phase motor

DShaded pole motor

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After the single-phase motor has started, its starting winding is disconnected. The motor will continue to run using which winding?

ARotor winding

BField winding

CRunning winding

DCompensating winding

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Which one is true about the comparison of the poles between the starting winding and the main winding of a single-phase induction motor?

AThe starting winding has more number of poles

BThe starting winding has lesser number of poles

CBoth windings have equal number of poles

DThe starting winding has no poles

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What is the purpose of the shading coil in a shaded pole motor?

ATo reduce windage loss

BTo protect against sparking

CTo reduce friction losses

DTo produce rotating magnetic field

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Which of the following single-phase motors is relatively free from mechanical and magnetic vibrations?

AHysteresis motor

BShaded pole motor

CCapacitor-start, capacitor-run motor

DUniversal motor

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Which of the following motors is an interesting example of beneficially utilizing a phenomenon that is often considered undesirable?

AHysteresis motor

BReluctance motor

CStepper motor

DShaded pole motor

#167📘 EE Pocket Reviewer RojasEasy

Which of the following is an inherent characteristic of a single-phase induction motor?

AIt is self starting

BIt is not self-starting

CIt runs faster on dc supply

DIt can rotate in one direction only

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For the same rating, the power factor of a single-phase motor is ____ that of a three-phase induction motor.

AEqual

BLess than

CGreater than

DEither B or

#169📘 EE Pocket Reviewer RojasEasy

Which of the following single-phase motors is suitable for timing and control purposes?

AUniversal motor

BRepulsion motor

CReluctance motor

DCapacitor-start motor

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Which motor is used to drive portable drills?

AUniversal motors

BCapacitor run motors

CHysteresis motors

DSplit-phase motors

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Which of the following single-phase motors has the least noise?

AUniversal motor

BCapacitor motor

CHysteresis motor

DShaded pole motor

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The capacitor-start, capacitor-run motor is used in what type of applications?

AWhere high starting torque is required

BWhere silence is important

CWhere noisy operation is not important

DWhere constant speed is required

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A repulsion motor is equipped with which of the following components?

ASlip rings

BA commutator

CA repeller

DNone of these

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Which of the following single-phase ac motors is best suited for driving tape recorders and record players?

AShaded pole motor

BReluctance motor

CHysteresis motor

DSeries ac motor

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Which of the following is an outstanding feature of a universal motor?

AIt has best performance at low frequency

BIt has slow speed at all loads

CIt has excellent performance on dc supply

DIt has the highest output kW per kg ratio

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What type of rotors are used in single-phase motors?

ASquirrel-cage rotors

BWound rotors

CCommutator type rotors

DEither A or

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Which statements below describes a reluctance motor?

AIt is a variable torque motor

BIt is a low torque variable speed motor

CIt is a self starting type synchronous motor

DIt is a low noise, slow speed motor

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Which one is a disadvantage of a shaded pole motor?

AIts starting torque is low

BIt has very little overload capacity

CIt has low efficiency

DAll of these

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Which of the following motors is preferred for traction work?

AUniversal motor

BDC series motor

CSynchronous motor

DThree-phase induction motor

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What is the name of the device used to control a motor from a distant location?

AManual starter

BDrum switch

CSnap switch

DMagnetic controller

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