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4

In an ac circuit with inductive reactance ?, the

A. Phase angle of the circuit is always 45�

B. Voltage across the inductance must be 90� out o f-phase witht he applied voltage

C. Current through the inductance lags its induced voltage by 90�

D. Current through the inductance and voltage across it are180� outof-phase

Correct Answer :

C. Current through the inductance lags its induced voltage by 90�


Related Questions

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The ratio of the flux density to the electric field intensity in the dielectric is called

A. Permittivity

B. Field intensity

C. Permeability

D. Elasticity

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4

An open inductor has

A. Zero resistance and infinite inductance

B. Infinite resistance and zero inductance

C. Infinite resistance and infinite inductance

D. Zero resistance and zero inductance

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4

An ac series circuit is composed of a resistance of 20 a inductive reactance of 40 a and a capacitive reactance of 15 . If a current of 1 ampere is flowinga what is the applied voltage

A. 320 V

B. 32 V

C. 220 V

D. 22 V

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4

When two unequal values of resistors are connected in parallel across a dc sourcea greater current flows through the

A. Higher resistance

B. Lower resistance

C. Higher wattage resistance

D. Lower wattage resistance

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4

What is the reading of an ohmmeter for a shorted capacitor?

A. Zero

B. Infinity

C. k

D. M

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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

The reason why electrical appliances are connected in parallel.

A. It is a simple circuit

B. This makes the operation of appliances independent with each other

C. This results in reduced power consumption

D. All of the above

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4

What is the reciprocal of capacitance?

A. Reluctance

B. Susceptance

C. Elastance

D. Conductance

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4

A trimmer is a variable capacitor in which capacitance is varied by changing the

A. Number of plates

B. Dielectric

C. Distance between plates

D. Plate area

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4

The open-circuit voltage at the terminal of load RL is 60V. Under the condition of maximum power transfera the load voltage will be

A. 60 V

B. 15 V

C. 20 V

D. 30 V

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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

What dielectric is generally employed by a variable capacitor?

A. Mica

B. Air

C. Electrolyte

D. Ceramic

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4

In a rectangular wavea the peak factor is

A.

B.

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When voltage is applied across a ceramic dielectric the electrostatic field p roduced is 50 times greater than air dielectric. The dielectric constant of ceramic therefore is

A.

B.

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Electron flow assumes charges flow from

A. Negative to positive

B. Negative to negative

C. Positive to negative

D. Positive to positive

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Two complex numbers or phasors are said to be conjugate if they

A. Differ only in the algebraic sign of their quadratic components

B. Differ only in the algebraic sign of their real components

C. Are equal in their real and quadrature components including alge

D. Are equal in their real components but differ in their quadrature components i ncluding algebraic signs.

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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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What is the reciprocal of quality factor?

A. Power factor

B. Reactive factor

C. Dissipation factor

D. 1/Q factor

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4

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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The average value of a triangular or sawtooth wave is _____ times its peak value.

A.

B.

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

A.

B.

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For greater accuracya the value of phase angle should be determined from

A. Cos

B. Tan

C. Sin

D. Sec

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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

In an ac circuit with a resistive branch and an inductive branch in parallela the

A. Voltage across the inductance leads the voltage across the resistance by 90°

B. Resistive branch current is 90° out of phase with the inductive branch current

C. Resistive and inductive branch currents have the same phase

D. Resistive and inductive branch currents are 180° outof-phase

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4

If a certain circuit has a current that is lagging the voltage by 45�a then it displays

A. Pure inductive reactance

B. Resistance and capacitance reactance

C. Resistance and inductive reactance

D. Pure capacitive reactance

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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 is considered as the effect of a dielectric material?

A. Increasing capacitance

B. Decreasing capacitance

C. Reducing the working voltage

D. Increasing the distance between the plates

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4

A series RL circuit has R of 10 and XL of 5 a its impedance in rectangular form is given by

A. 10 +j 5

B. 10 + j 10

C. 10 ± j 5

D. 10 ± j 10

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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

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

A. Voltage magnification factor

B. Current magnification factor

C. Gain magnification factor

D. Resonance magnification factor