Electrical Engineering · Question Bank

DC Motors

218 of 285 questions match · page 8 of 11. Answer in your head first, then check the solution.

📘 EE Mock Board Exam
TypeAll 218Problem solving 10Objective 208
DifficultyAll 285Easy 218Medium 54Hard 13
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#141📘 EE Pocket Reviewer RojasEasy
Which of the following motor bearings should be oiled regularly?
ABall bearings
BSleeve bearings
CBoth A and B
DNone of these
#142📘 EE Pocket Reviewer RojasEasy
What is the meaning of the power stated in the nameplate of a dc motor?
AIt is the power drawn from the supply lines
BIt is the gross power that can be developed
CIt is the power output from the shaft
DIt is the maximum power that can be supplied to the motor
#143📘 EE Pocket Reviewer RojasEasy
Which dc motors is commonly used in rolling mills?
ASeries motors
BShunt motors
CCumulative compound motors
DDifferential compound motors
#144📘 EE Pocket Reviewer RojasEasy
Which motor is best suited to drive ceiling fans?
AUniversal motor
BCapacitor start and run motor
CPermanent capacitor motor
DCapacitor start motor
#145📘 EE Pocket Reviewer RojasEasy
Which of the following can reverse the direction of rotation of a universal motor?
AInterchange the brush leads
BReverse the supply terminals
CChange the supply voltage, like from ac to dc
DIt cannot be reversed
#146📘 EE Pocket Reviewer RojasEasy
A capacitor-start, capacitor-run single-phase motor is basically which types of motor?
AAn ac series motor
BA single-phase synchronous motor
CA two-phase induction motor
DA dc series motor
#147📘 EE Pocket Reviewer RojasEasy
What is the type of capacitor used in a capacitor start induction motor?
APaper capacitor
BCeramic capacitor
CElectrolytic capacitor
DMica capacitor
#148📘 EE Pocket Reviewer RojasEasy
Which of the following single-phase motors has rotors without a winding?
ARepulsion motor
BUniversal motor
CReluctance motor
DHysteresis motor
#149📘 EE Pocket Reviewer RojasEasy
The purpose of the centrifugal switch is to disconnect the starting winding after ____
AThe rotor is run about 30 to 45 seconds
BThe rotor is run about 2 to 3 minutes
CThe rotor has picked up its rated speed
DThe rotor has picked up about 70 to 80% of its rated speed
#150📘 EE Pocket Reviewer RojasEasy
What is the purpose of the starting winding in a single-phase induction motor?
AIt is used to reduce the losses at start
BIt is used to control the magnitude of the starting current
CIt is used to produce a rotating flux in conjunction with the main winding
DIt is used to protect the motor from overspeeding at starting instant
#151📘 EE Pocket Reviewer RojasEasy
Which of the following determines the direction of rotation of a hysteresis motor?
ARetentivity of the material
BAmount of hysteresis loss
CPermeability of the rotor material
DPosition of the shaded pole with respect to the main pole
#152📘 EE Pocket Reviewer RojasEasy
In a single-phase induction motor, the centrifugal switch is connected where?
AIn series with the main winding
BIn series with the starting winding
CIn parallel with the main winding
DIn series with the line connecting to the motor
#153📘 EE Pocket Reviewer RojasEasy
What is the purpose of the running capacitor in a capacitor-start, capacitor-run motor?
ATo improve the power factor
BTo increase the load capacity
CTo reduce fluctuations in torque
DTo keep the speed constant
#154📘 EE Pocket Reviewer RojasEasy
Which of the following single-phase motors has the highest starting torque?
AUniversal motor
BShaded pole motor
CCapacitor start motor
DSplit-phase motor
#155📘 EE Pocket Reviewer RojasEasy
The starting winding of a single-phase motor is placed where?
ARotor
BStator
CArmature
DField
#156📘 EE Pocket Reviewer RojasEasy
What is the method used to vary the speed of a universal motor used in sewing machines?
ABy tapping the field windings
BBy centrifugal mechanism
CBy friction
DBy varying the resistance
#157📘 EE Pocket Reviewer RojasEasy
Which of the following single-phase motors will operate at higher power factor?
AUniversal motor
BShaded pole motor
CCapacitor start motor
DSplit-phase motor
#158📘 EE Pocket Reviewer RojasEasy
What is the circuit connection of the main winding and starting winding of a single-phase motor?
ASeries
BParallel
CSeries-parallel
DParallel-series
#159📘 EE Pocket Reviewer RojasEasy
In a shaded pole motor, the direction of rotation depends on which one?
ASupply frequency
BNumber of stator poles
CWhich half of the pole is shaded
DSupply voltage
#160📘 EE Pocket Reviewer RojasEasy
The electrical fault in a motor normally occurs where?
AIn the motor windings
BIn the commutator
CIn the brushes
DIn the control equipment

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