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4

For maximum power transfera what is the relation between load resistance RL and internal resistance R of the voltage source?

A. RL= 2 r

B. RL= 1.5 r

C. RL= r

D. RL= 3 r

Correct Answer :

C. RL= r


Related Questions

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4

The ratio of maximum value to the effective value of an alternating quantity is called

A. Form factor

B. Peak factor

C. Dynamic factor

D. Leakage factor

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4

The ratio between the active power and the apparent power of a load in an ac circuit is called

A. Quality factor

B. Power factor

C. Power ratio

D. Power reactive

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4

What is considered as the most important value of a sine wave?

A. Effective value

B. Peak value

C. Average value

D. Instantaneous value

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4

Why are inductance and capacitance not relevant in a dc circuit?

A. Because it is a simple circuit

B. Because dc circuits require only resistance as load

C. Because they do not exist in a dc circuit

D. Because frequency of dc is zero

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4

The voltage cannot be exactly in phase with the current in a circuit that contains

A. Only capacitance

B. Only resistance

C. Inductance and capacitance

D. Inductancea capacitance and resistance

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4

What is the hot resistance of a 100 Wa 220 V incandescent lamp?

A.

B.

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4

The symbol Q refers to

A. Resonance quotient

B. Quality factor

C. Power quotient

D. Qualification test

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4

Which of the following does not refer to electrical energy?

A. Volt-ampere

B. Joule

C. Watt-second

D. Volt-coulomb

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4

Which waveform in which the rms value and the mean value are equal?

A. Square wave

B. Triangular wave

C. Sine wave

D. Sawtooth

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4

What is the peak factor for alternating current or voltage varying sinusiodally?

A.

B.

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4

What capacitance exists not through design but simply because two conducting surfaces are relatively close to each other?

A. Surge

B. Stray

C. Natural

D. Normal

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4

The impedance in the study of electronics is represented by resistan

A. Inductance

B. Capacitance

C. Inductance and capacitance

D. Reactance

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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

The voltage lags the current by cycle in a

A. Purely resistive circuit

B. Purely inductive circuit

C. Purely capacitive circuit

D. Circuit containing resistancea capacitance and inductance

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4

What is the total capacitance of 10 capacitorsa each of 20 F in series?

A. 200 F

B. 2 F

C. 100 F

D. 0.5 F

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4

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

A lead conductor has a resistance of 25 at 0 �C. Determine its resistance at -30 �C

A.

B.

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4

In an ac circuit with XL and R in seriesa the

A. Voltages across R and XL are in phase

B. Voltage across R lags the voltage across XLby 90°

C. Voltages across R and XL are 180° outof-phase

D. Voltage across R leads the voltage across XLby 90°

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4

A linear circuit is one whose parameters

A. Change with change in voltage

B. Change with change in current

C. Do not change with voltage and current

D. Change with change in voltage and current

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4

In a complex number 5 + j 10a 10 is called ___ part.

A. Imaginary

B. Real

C. Conjugate

D. Integer

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4

An electric circuit contains

A. Passive elements

B. Active elements

C. Both active and passive elements

D. Reactive elements

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4

If the inductance is decreaseda the impedance of the circuit containing a resistor a capacitor and an inductor connected in series to an ac source

A. Decreases

B. Increases

C. Decreases or increases

D. Decreasesa increases or remains the same

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4

In a series circuit with unequal resistances the

A. Highest R has the highest V

B. Lowest R has the highest V

C. Lowest R has the highest I

D. Highest R has the highest I

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4

For series capacitorsa total charge is

A. The sum of individual charges

B. Equal to the charge of either capacitors

C. Equal to the product of the charges

D. The quotient of the charges

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4

Which of the following capacitors are used only in dc circuits?

A. Mica

B. Ceramic

C. Mylar

D. Electrolytic

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4

In the 5-band method of capacitor color codinga the first band indicates

A. Temperature coefficient

B. Tolerance

C. 1stdigit

D. Capacitance value

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4

Refers specifically to steady state values of quantities in ac circuits which are complex numbers.

A. Domain

B. Scalar quantity

C. Vector quantity

D. Phasor quantity

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4

Two capacitors of capacitance 9 F and 18 F in series will have a total capacitance of

A. 27 F

B. 162 F

C. 6 F

D. 180 F

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4

A capacitive load always has a ______ power facto

A. Leading

B. Lagging

C. Zero

D. Unity

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4

If one resistance in a series connection is opena then

A. The current is zero in all the other resistances

B. The current is maximum in all the other resistances

C. The voltage is zero across the open resistance

D. The voltage is infinite across the open resistance