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Electricity & Magnetism - Motors MCQs

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Electricity & Magnetism - Motors

Electricity & Magnetism - Motors MCQs With Answers

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CSS - PMS - CCE - PCS - General Science Electricity & Magnetism - Motors
Which device performs the reverse energy conversion of a motor?
A. Resistor
B. Generator
C. Transformer only
D. Thermometer
Correct Answer: B
A generator converts mechanical energy into electrical energy.
CSS - PMS - CCE - PCS - General Science Electricity & Magnetism - Motors
What component supplies magnetic field in a simple motor?
A. Permanent magnets or electromagnets
B. Fuse only
C. Ammeter only
D. Capacitor only
Correct Answer: A
The stator field interacts with current in the armature or rotor.
CSS - PMS - CCE - PCS - General Science Electricity & Magnetism - Motors
What is the function of a commutator in a simple DC motor?
A. Cool the motor
B. Increase resistance only
C. Store charge permanently
D. Reverse coil current every half-turn to maintain torque direction
Correct Answer: D
The split-ring commutator reverses current so rotation continues in the same sense.
CSS - PMS - CCE - PCS - General Science Electricity & Magnetism - Motors
What does Fleming's left-hand rule determine?
A. Direction of heat flow
B. Direction of gravity
C. Direction of induced current in a generator
D. Direction of force in a motor
Correct Answer: D
The left-hand rule gives the relationship among field, current and force in motor action.
CSS - PMS - CCE - PCS - General Science Electricity & Magnetism - Motors
What force principle allows a current-carrying conductor in a magnetic field to move?
A. Magnetic force on current
B. Nuclear force
C. Buoyant force
D. Surface tension
Correct Answer: A
A conductor carrying current experiences force in an external magnetic field.
CSS - PMS - CCE - PCS - General Science Electricity & Magnetism - Motors
What energy conversion occurs in an electric motor?
A. Heat to mass
B. Mechanical energy to electrical energy only
C. Chemical energy to light only
D. Electrical energy to mechanical energy
Correct Answer: D
Motors use electromagnetic forces to produce motion.
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