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What is the complex impedance of a circuit with an absolute resistance of 300 ?

A. 0 + j 300

B. 300 + j 90

C. 0 ± j 300

D. 300 +j 0

Correct Answer :

D. 300 +j 0


Related Questions

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Metal tin becomes superconductor at approximately

A. 6 K

B. 3.7 K

C. 5 K

D. 4.7K

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4

Delta to wye or wye to delta transformation technique is applied to a ___ network.

A. One-terminal

B. Two-terminal

C. Three-terminal

D. Complex

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4

The graph between an alternating quantity and time is called

A. Sine wave

B. Curve

C. Waveform

D. A plot

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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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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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Which of the following is not a factor affecting dielectric strength?

A. Mass

B. Moisture content

C. Temperature

D. Thickness

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When capacitors are connected in seriesa the total capacitance is

A. Smaller than the smallest capacitor

B. Smaller than the largest capacitor

C. Greater than any of the capacitor

D. Greater than the largest capacitor

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4

A switch designed to have low capacitance between its terminal when open.

A. LOCAP switch

B. AntiLOCAP switch

C. Anticapacitance switch

D. Capacitance switch

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4

In an ac wavea 30 degrees of phase is ___ of a cycle.

A. ½

B.

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At what frequency will the current in a series RLCcircuit reach its maximum value for an applied voltage of 15 V with R = 500 a L = 100 H and C= 0.001 F?

A. 503 kHz

B. 403 kHz

C. 603 kHz

D. 303 kHz

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4

A rheostat is a form of

A. Variable resistor

B. Variable capacitor

C. Potentiometer

D. Thermocouple

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4

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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The charging of a capacitor through a resistance obeys

A. Exponential law

B. Logarithmic law

C. Linear law

D. Square law

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What is the form factor of a triangular wave?

A.

B.

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Points to be considered in choosing a capacitor

A. Working voltage

B. Type of dielectric

C. Capacitance

D. All of the above

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Transient period is considered over after

A.

B.

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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 statements below is not true?

A. Current source is an active element

B. Resistor is a linear element

C. Voltage source is a passive element

D. Diode is a non-linear element

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When the power factor of a circuit is zeroa

A. Power absorbed is maximum

B. Power absorbed is minimum

C. Power absorbed is zero

D. The impedance is minimum

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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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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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An inductive circuit of resistance 16.5 and inductance of 0.14 H takes a current of 25 ?. if the frequency is 50 Hza find the supply voltage.

A. 1501 V

B. 1174V

C. 1877V

D. 991 V

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What is the reciprocal of capacitance?

A. Reluctance

B. Susceptance

C. Elastance

D. Conductance

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Series resonance occurs when

A. XL= XC

B. XL= R

C. Z = R

D. Both A and C

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4

In an ac circuita the power dissipated as heat depends on

A. Impedance

B. Capacitive reactance

C. Resistance

D. Inductive reactance

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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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Which of the following is not considered a physical factor affecting resistance?

A. Length

B. Material type

C. Temperature

D. Cross-sectional

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How many coulombs are delivered by a storage battery in 25 hours if it is supplying current at the rate of 3 A?

A. 2.592 x 105C

B. 2.592 x 103 C

C. 2.592 x 108 C

D. 2.592 x 1012 C

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In a series RLCcircuit

A. The current lags VLby 90�

B. The current leads VLby 90�

C. XL leads Xcby 90�

D. Z = jXL at resonance

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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