Question # 1

In series RC circuit when R=X_c, then the phase angle is

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0°

90°

70°

45°

Nowadays, Most of the electric energy is produced by the A.C. generators using:

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Hydal water

Geothermal energy

Solar energy

Biomass

Both (B) and (D)

At resonance, the impedance of RLC series circuit is

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Maximum

Zero

Minimum

Determinate

The total reactance of a series RLC circuit at resonance is

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zero

Equal to the resistance

Infinity

Capacitive

The phase angle of a series RLC circuit at resonance is

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180°

90°

0°

None of the these

If the value of C in a series RLC circuit is increased, the resonant frequency

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Is not affected

Increase

Remains the same

Decreases

A diode characteristic curve is a plot between

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current and time

voltage and time

voltage and current

forward voltage and reversed voltage

Which one of the following is correct?

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V_o= 1.414 V_rms

I_ams= 1.414 I_o

VO = 10.70 Vrms

Both a and b

Average value of A.C voltage during one cycle is

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1

Zero

Maximum

Variable

When the pn-junction is in reversed biased, current flows through the junction due to the

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majority carriers

minority carriers

either of them

none of them

Alternating current can induce voltage because it has a

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High peak value

Varying magnetic field

Stronger field than direct curren

Constant magnetic field

To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance

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5.07 pF

50 pF

0.507 pF

507 pF

A resonance curve for RLC series circuit is a plot of frequency versus

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Voltage

Current

Impedance

Reactance

The wave form of alternating voltage is the graph between:

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Voltage across X-axis and time across y-axis

Current and time

Voltage along y-axis and time along x-axis

Voltage and current

Either (B) or (D)

Alternating current can be transmitted:

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To long distance

At very high cost

At very low cost

Both (A) and (C)

Both (A) and (B)

The circuit which is used to smooth the output voltage of the full-wave rectification is known as

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transformer

rectifier

filter

none of these

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ECAT Physics Chapter 16 Alternating Current Online Test MCQs With Answers

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