ENGINEERING MECHANICS QUIZ

In a series L-C circuit at the resonant frequency the

Impedance is maximum

Current is maximum

Voltage across C is minimum

Current is minimum

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Power factor of the following circuit will be zero

Inductance

Resistance

Both of the listed here

Capacitance

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If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is

A sinusoid of double the frequency

A sinusoid of the same frequency

A sinusoid of half the original frequency

None of the listed here

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Inductance of coil

Becomes zero with the increase in supply frequency

Decreases with the increase in supply frequency

Increases with the increase in supply frequency

Is unaffected by the supply frequency

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YOUR ANSWER : ?

All definitions of power factor of a series R-L-C circuit are correct except

Ratio of kW and kVA

Ratio of net reactance and impedance

Ratio of J and Z

Ratio of W and VA

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In an AC. circuit, a low value of kVAR compared with kW indicates

Unity power factor

Low efficiency

High power factor

Maximum load current

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The power is measured in terms of decibels in case of

Transformers

Auto transformers

Electronic equipment

Current transformers

TRUE ANSWER : ?
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In an A.C. circuit power is dissipated in

Inductance only

Capacitance only

Resistance only

None of the listed here

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Pure inductive circuit takes power from the A.C. line when

Both applied voltage and current decrease

Applied voltage increases but current decreases

Applied voltage decreases but current increases

Both applied voltage and current increase

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The series and parallel resonance on L-C circuit' differs in that

Series resonance needs a high-resistance source for sharp increase in current

Parallel resonance needs a low-resistance source for a sharp increase in impedance

Series resistance needs a low-resistance source for sharp rise in current

Parallel resonance needs a low-resistance source for a sharp rise in line current

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