Case Based Questions (MCQ)

Class 10
Chapter 13 Class 10 - Magnetic Effects of Electric Current

(iv) In one minute the output AC completes 50 cycles

The output frequency of wind turbine is 50 Hz, this indicates that

• The fan of the turbine moves 50 times in one second.
• The polarity of the output alternating current changes every 1/100 seconds.
• In one minute the output AC completes 50 cycles.

Therefore option (ii) is incorrect.

So, the correct answer is (ii)

(iv) Electric bulb

Devices that work on the principle of electromagnetic induction are:

• Electric generators
• Electric fan
• Dynamo
• Induction cooker
• Graphic tablet

So, we understand that the electric bulb does not work on the principle of electromagnetic induction.

So, the correct answer is (iv)

(iv) armature

A transformer is used to increase the AC voltage to  make it compatible with the end user.

So, the correct answer is (ii)

(iv) generator

Generator produces electric current.

So, the correct answer is (iv)

(iv) both are not applied for generator and motor.

Fleming’s left hand rule is used in electric motors.

Fleming’s right hand rule is used in electric generators.

So, the correct answer is (ii).

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