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4

The ratio of W/VA in an ac circuit means

A. Power factor

B. Reactive factor

C. Quality factor

D. Load factor

Correct Answer :

A. Power factor


Related Questions

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4

Which statement is true?

A. A series resonant circuit is of high impedance

B. A parallel resonant circuit is of low impedance

C. A series resonant circuit is inductive if it operates at a frequency higher than the resonant frequency

D. A parallel resonant circuit is inductive if it operates at a frequency higher than the resonant frequency

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4

An intermittent and non-symmetrical alternating current like that obtained from the secondary winding of an induction coil

A. Faradic current

B. Transient ac current

C. Inductive current

D. Capacitive current

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4

Loop currents should be assumed to flow in which direction

A. Straight

B. Clockwise

C. Counter-clockwise

D. Either B or C arbitrarily selected

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4

Which statement is true about a passive circuit?

A. A circuit with neither a source of current nor a source of potential difference

B. A circuit with a voltage source

C. A circuit with a current source

D. A circuit with only resistance as a load

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4

Inductive reactance applies only to sine waves because it

A. Increases with lower frequencies

B. Increases with lower inductance

C. Depends on the factor 2

D. Decreases with higher frequencies

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4

VL= VCin a series RLCcircuit when

A. The value of the impedance is minimum

B. The power factor is zero

C. The current leads the total voltage by 90�

D. The total voltage is zero

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4

The internal resistance of an ideal current source is

A. Infinite

B. Zero

C. Equal to the load resistance

D. To be determined

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4

A series-parallel combination of identical resistors will

A. Increase the power rating compared with one resistor alone

B. Increase the voltage rating compared with one resistor alone

C. Reduce the voltage rating compared with resistor alone

D. Result in an expensive circuit

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4

When two complex conjugates are subtracteda the result is a

A. Quadrature component only

B. Complex component

C. In-phase component

D. Real component

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4

Electric energy refers to

A. Volt divided by coulomb

B. Voltampere

C. Volt-coulomb

D. Watt divided by time

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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

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4

Which of the following has a positive temperature coefficient?

A. Mica

B. Manganin

C. Silicon

D. Carbon

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4

The potential gradient in a cable is maximum in

A. Conductor

B. Outer sheath

C. Insulation

D. Uniformly all over

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4

A trigger circuit consisting of a capacitor of 0.01 F is connected in series with a resistor. If the circuit requires 100 Vdcto operatea determine the value of the resistor when time constant is 0.009s.

A.

B. 900 k

C. 900 M

D. 900 G

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4

Of the equivalent combination of unitsa which one is not equal to watt?

A. 2/V

B. AV

C. A2

D. J/s

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4

The temperature-resistance coefficient of pure gold is

A.

B.

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4

If the output resistance of a voltage source is 4 a it internal resistance should be

A.

B.

D. Infinite

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4

Which of the following dielectric materials makes the highest-capacitance capacitor?

A. Air

B. Barium-strontium titanite

C. Mica

D. Electrolyte

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4

What is the efficiency under the conditions of maximum power transfer?

A.

B.

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4

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

A. Mica

B. Ceramic

C. Paper

D. Electrolytic

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4

The value of temperature coefficient ( ) is dependent upon

A. The nature of material and temperature

B. The length of material

C. The cross-sectional area of the material

D. The volume of the material

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4

When frequency of an ac wave decreasesa the value of XLin a coil

A. Approaches zero

B. Gets larger positively

C. Gets larger negatively

D. Stays constant

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4

In a resonant circuita if Q ? 10 resonant frequency _______ bandwidth.

A. Bisects

B. Exceeds

C. Is less than

D. Is equal to

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4

If three 9 mH inductors are connected in parallel without mutual inductance then the total i nductance is

A. 3 mH

B. 9 mH

C. 27mH

D. 18 mH

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4

Permeability is otherwise known as

A. Magnetic conductivity

B. Magnetic susceptibility

C. Electric conductivity

D. Electric susceptibility

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4

The farad is not equivalent to which of the following combination of units

A. CV2

B. C2/J

C. C/V

D. J/V2

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4

What is the purpose of a load in an electric circuit?

A. To increase the circuit current

B. To decrease the circuit current

C. To utilize electrical energy

D. To make the circuit complete

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4

The superposition theorem is used when the circuit contains

A. Reactive elements

B. Active elements

C. Number of voltage sources

D. Single voltage source

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4

Which of the following is also known as antiresonant circuit?

A. Parallel resonant circuit

B. Series resonant circuit

C. Tuned circuit

D. Tank circuit

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4

In adding or subtracting phasor quantitiesa ___ form is the most convenient.

A. Polar

B. Rectangular

C. Trigonometric

D. Exponential