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Q1. | Selectivities of different resonance circuits are compared in terms of their |

A. | Impedances [Wrong Answer] |

B. | Reactances [Wrong Answer] |

C. | Frequencies [Wrong Answer] |

D. | Band widths [Correct Answer] |

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

⇒ The power factor of incandescent bulb is

0.8 lagging

0.8 leading

Unity

Zero

⇒ The best place to install a capacitor is

Very near to inductive load

Across the terminals of the inductive load

Far away from the inductive load

Any where

⇒ 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

⇒ The negative maximum of a cosine wave occurs at

30

45

90

180

⇒ For a sine wave with peak value I

_{max}the r.m.s. value is

0.5 I

_{max}

0.707 I

_{max}

0.9 I

_{max}

1.414 I

_{max}

⇒ The transient currents are associated with the

Changes in the stored energy in the inductors and capacitors

Impedance of the current

Applied voltage to the circuit

Resistance of the circuit

⇒ In an A.C. circuit I sin Φ is called

Active component

Wattless component

Any of the above

None of these

⇒ A sine wave of voltage varies from zero to maximum of 200 V. How much is the voltage at the instant of 30° of the cycle ?

50V

82.8V

100V

173.2 V

⇒ 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

_{L}sinΦ

3 V

_{L}I

_{L}cosΦ

⇒ 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

⇒ Capacitive reactance is more when

Capacitances is less and frequency of supply is less

Capacitance is less and frequency of supply is more

Capacitance is more and frequency of supply is less

Capacitance is more and frequency of supply is more

⇒ Two sinusoidal quantities are said to be phase quadrature, when their phase difference is

0

30°

45°

90°

⇒ The shunt element in a band pass filter is

Capacitive

Inductive

Parallel combination of L and C

Series combination of L and C

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

Voltage

VA

kW

kVAR

⇒ While drawing vector diagram for a series circuit the reference vector is

Voltage

Current

Power

Phase angle

⇒ The value of operator j2 is equal to

Zero

+1

-1

√-1

⇒ A coil with large distributed capacitance has a

High resonant frequency

Low resonant frequency

Low quality factor

Low resistance

⇒ Which of the following statement is incorrect ?

Resistance is a passive element

Voltage source is an active element

Conductance is a passive element

Current source is a passive element

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

0.5 of peak value

0.707 of peak value

Same as peak value

Zero

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

Unity

Lagging

Leading

Lagging or leading

⇒ In the R - L - C containing R = 4.5ω L = 0.06 H,C = 0.6 µF the power factor will be

Zero

Lagging

Leading

Unity

⇒ The double energy transient occur in the

Purely inductive circuit

R-L circuit

R-C circuit

R-L-C circuit

⇒ The shunt element of prototype high pass filter is

Resistive

Inductive

Capacitive

Combination of L and C

⇒ The power consumed in a circuit element will be least when the phase difference between the current and voltage

180°

90°

60°

0°

⇒ In a series resonant circuit, the impedance of the circuit is

Maximum

Minimum

Zero

Infinite

⇒ In an A.C. circuit, a low value of kVAR compared with kW indicates

Low efficiency

High power factor

Unity power factor

Maximum Load current

⇒ For the same peak value, which of the following wave has the least mean value ?

Half wave rectified sine wave

Triangular wave

Sine wave

Square wave

⇒ In a circuit containing R, L and C, power loss can take place

C only

L only

R only

All of the above

⇒ If resistance is 20 ω and inductance is 2H in a RL series circuit, then time constant of this circuit will be

0.001 S

0.1 S

10 S

100 S

⇒ At____ frequencies the parallel R-L circuit behaves as purely resistive.

Low

Very low

High

Very high