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4

In a series RLCcircuit

A. Increasing the frequency decreases the resistance

B. Increasing the frequency increases the resistance

C. Both XLand XCchange as frequency changes

D. Impedance will always decrease

Correct Answer :

C. Both XLand XCchange as frequency changes


Related Questions

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The reason why electrical appliances are not connected in series.

A. Greater electrical power saving

B. Power loss is minimum

C. Appliances have different current ratings

D. All of the above

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The Q-factor of a series resonant circuit is also known as

A. Current magnification factor

B. Voltage magnification factor

C. Load factor

D. Leakage factor

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A capacitor opposes change in

A. Voltage

B. Current

C. Voltage and current

D. Neither voltage nor current

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If a capacitor is rated for 200V dca what is its effective ac working voltage?

A. 50 V

B. 100 V

C. 200 V

D. 400 V

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Which one of the following elements serves as a protection against overload?

A. Fuse

B. Switch

C. Resistor

D. Relay

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Liquids that are good conductors because of ionization are called

A. Electrolytic

B. Bases

C. Acid

D. Electrolytes

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Which of the following is not a factor affecting capacitance oor?

A. Area of plates

B. Number of plates

C. Distance between plates

D. Dielectric material used

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4

With double the number of turns by the same length and areaa the inductance is

A. The same

B. Doubled

C. Quartered

D. Quadrupled

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Series resonant circuit is sometimes known as

A. Rejector circuit

B. Acceptor circuit

C. Inductive circuit

D. Capacitive circuit

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Permeability is otherwise known as

A. Magnetic conductivity

B. Magnetic susceptibility

C. Electric conductivity

D. Electric susceptibility

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For multi-plate capacitora capacitance is proportional to

A. Number of plates less one(n ± 1)

B. Number of plates plus one(n + 1)

C. Number of plates less two(n - 2)

D. Number of plates (n)

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4

What is the most convenient way of achieving large capacitance?

A. By using multiplate construction

B. By using air as dielectric

C. By decreasing distance between plates

D. By using dielectric of low permittivity

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Which of the following does not affect resistance?

A. Resistivity

B. Cross-sectional area

C. Mass

D. Length

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The factor 0.707for converting peak to rms applies only to

A. Square waves

B. Triangle waves

C. Sawtooth waves

D. Sine waves

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4

Which of the following is neither a basic physical law nor deliverable from one?

A. Ohm�s law

B. Coulomb�s law

C. Kirchhoff�s first law

D. Kirchhoff�s second law

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4

The wavelength of an alternating waveform depends upon the ___ of the variation.

A. Period

B. Number

C. Frequency

D. Amplitude

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A wire of one kilometre length has a resistance of 20 . If the length is halveda then the new resistance is ___ the original resistance.

A. Half

B. Twice

C. One-fourth

D. Three times

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A capacitor requires 12 C of charge to raise its potential of 3 V. What is the capacitance of the capacitor?

A. 36 F

B. 15 F

C. 0.25 F

D. 4 F

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4

Which of the following is a common material used in wire-wound resistors?

A. Manganin

B. Carbon

C. Bronze

D. German silver wire

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The curve between current and frequency is termed as

A. Voltage curve

B. Gain curve

C. Power curve

D. Resonance curve

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The capacitance of a capacitor is ___ relative permittivity.

A. Directly proportional to

B. Inversely proportional to

C. Equal to

D. Inversely proportional to the square of

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4

What is the specific resistance of a pure silicon?

A. 55 -mm

B. 55 -m

C. 55 -cm

D. 55 k -m

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4

The presence of an electric current is made known by

A. Electric shock

B. Effects produced

C. Magnetic shock

D. Flashing

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Which of the following conditions is not true for a series RLCcircuit at resonance?

A. Z = jXL

B. XL= XC

C. The power factor is one

D. The magnitude of Z is

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4

If the capacitance of mica capacitor is 5 times the capacitcitora then the relative permittivity of mica is

A.

B.

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Which of the following capacitors is suitable for dc filter circuits?

A. Mica

B. Ceramic

C. Paper

D. Electrolytic

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If two complex conjugates are addeda ___ components results.

A. In-phase

B. Quadrature

C. Complex

D. Outof-phase

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A capacitance of 6 ��F means

A. 6 pF

B. 6 nF

C. 6 fF

D. 6 aF

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In a circuita a passive element is one which

A. Supplies energy

B. Receives energy

C. Both supplies and receives energy

D. Attenuates signal

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Property of an electric circuit that dissipates electric energy

A. Reactance

B. Impedance

C. Resistance

D. Conductance