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Q1. | The power factor at resonance in RLC parallel circuit is |

A. | Zero [Wrong Answer] |

B. | 0.08 Lagging [Wrong Answer] |

C. | 0.8 Leading [Wrong Answer] |

D. | Unity [Correct Answer] |

View Answer
Explanation:-
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**Also Read Similar Questions Below :**

⇒ A coil with large distributed capacitance has a

High resonant frequency

Low resonant frequency

Low quality factor

Low resistance

⇒ The power factor at resonance in RLC parallel circuit is

Zero

0.08 Lagging

0.8 Leading

Unity

⇒ The peak value of a sine wave is 200 V. Its average value is

127.4V

141.4V

282.8V

200 V

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

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Voltage

Impedance

Reactance

⇒ The r.m.s. value and mean value is the same in the case of

Triangular wave

Sine wave

Square wave

Half wave rectified sine wave

⇒ A heater is rated as 230 V, 10 KW, AC. The value 230 V refers t

Average voltage

r.m.s. voltage

Peak voltage

None of these

⇒ The period of a wave is

The same as frequency

Time required to complete one cycle

Expressed in amperes

None of the above

⇒ When an alternating current passes through an ohmic resistance the electrical power converted into heat is

Apparent power

True power

Reactive power

None of the above

⇒ Form factor for a sine wave is

1.414

0.707

1.11

0.637

⇒ In a pure resistive circuit

Current lags behind the voltage by 90°

Current leads the voltage by 90°

Current can lead or lag the voltage by 90°

Current is in phase with the voltage

⇒ The time period of a sine wave is 1/50 seconds. Its frequency is

20 Hz

30 Hz

40 Hz

50 Hz

⇒ For the same peak value which of the following wave will have the highest r.m.s. value ?

Square wave

Half wave rectified sine wave

Triangular wave

Sine wave

⇒ The capacitors for power factor correction are rated in terms of

Voltage

VA

kW

kVAR

⇒ Skin effect occurs when a conductor carries current at____ frequencies.

Very low

Low

Medium

High

⇒ How much r.m.s. current does a 300 W. 200V bulb take from the 200 V, 50 Hz power line ?

0.5A

1.5 A

2A

3A

⇒ Power factor of an inductive circuit is usually improved by connecting capacitor to it in

Parallel

Series

Either (A) or (B)

None

⇒ The r.m.s. value of a sine wave is 100A. Its peak value is

70.7 A

141.4A

150A

282.8 A

⇒ The r.m.s. value of pure cosine function is

0.5 of peak value

0.707 of peak value

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Zero

⇒ Two waves of the same frequency have opposite phase when the phase angle between them is

360°

180°

90°

0°

⇒ The power taken by a 3-Φ load is given by the expression

√3 V

_{L}I

_{L}sinΦ

√3 V

_{L}I

_{L}cosΦ

3 V

_{L}I

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3 V

_{L}I

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⇒ The r.m.s. value of a sinusoidal A.C. current is equal to its value at an angle of____ degrees

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60

45

30

⇒ The dual of a loop is

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Node pair

Mesh

Tree

⇒ The power factor of a series R-L-C circuit at its half-power points is

Unity

Lagging

Leading

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⇒ Power factor of the following circuit will be zero

Resistance

Inductance

Capacitance

Both (B) and (C)

⇒ For the same peak value of voltage which wave form will have the least r.m.s. value ?

Sine wave

Square wave

Triangular wave

Full wave rectified sine wave

⇒ The power factor of incandescent bulb is

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0.8 leading

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⇒ Which of the following waves has the highest value of peak factor '?

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Triangular wave

⇒ Inductance affects the direct current flow

Only at the time of turning off

Only at the time of turning on

At the time of turning on and off

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⇒ The form factor is the ratio of

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r.m.s. value to average value

Average value to r.m.s. value

None of these

⇒ In A.C. circuit laminated iron is invariably used in order to

Reduce eddy current loss

Increase heat radiation

Make assembly cheap and easier

Reduce circuit permeability