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4

Metal tin becomes superconductor at approximately

A. 6 K

B. 3.7 K

C. 5 K

D. 4.7K

Correct Answer :

B. 3.7 K


Related Questions

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4

What theorem is usually used in the analysis of transistor circuit?

A. Superposition theorem

B. Millman�s theorem

C. Thevenin�s theorem

D. Norton�s theorem

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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

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

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

A. ½

B.

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4

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

A. Dielectric

B. Number of plates

C. Plate area

D. Distance between plates

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4

What theorem is generally used in the analysis of vacuum tubes?

A. Superposition theorem

B. Millman�s theorem

C. Thevenin�s theorem

D. Norton�s theorem

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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

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4

Leakage resistance in a capacitor results into

A. Internal heating

B. Internal bleeding

C. Shorter useful life

D. Short-circuiting

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4

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

A. Paper

B. Mica

C. Air

D. Electrolyte

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4

When two coils of identical reactance are in parallel without mutual inductancea the reactance of the combination is ___ the reactance of each coil.

A. One half

B. Twice

C. Four times

D. One fourth

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4

Norton�s theorem is ____ Thevenin�s theorem.

A. The same as

B. The converse of

C. Older that

D. More accurate than

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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

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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

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

A. Fuse

B. Switch

C. Resistor

D. Relay

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4

A capacitor opposes change in

A. Voltage

B. Current

C. Voltage and current

D. Neither voltage nor current

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4

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

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

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

A. Mica

B. Ceramic

C. Mylar

D. Electrolytic

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4

Metal tin becomes superconductor at approximately

A. 6 K

B. 3.7 K

C. 5 K

D. 4.7K

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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

In an RL series circuita

A. Current lags voltage by less than 90�

B. Current lags voltage by 180�

C. Current lags voltage by 90�

D. Current leads voltage by 90�

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4

When the movable plates of a gang capacitor completely overlap the fixed platesa the capacitance of the capacitor is

A. Halfway between maximum and minimum

B. Maximum

C. Minimum

D. Zero

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4

In Norton�s theorema the short circuit current is obtained by

A. Opening the load terminals

B. Shorting the load terminals

C. Opening the voltage source

D. Shorting the voltage source

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4

Series resonance occurs when

A. XL= XC

B. XL= R

C. Z = R

D. Both A and C

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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

What is the most common non-sinusoidal waveform?

A. Square wave

B. Triangular wave

C. Trapezoidal wave

D. Sawtooth wave

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4

The electric field strength between capacitor plates has a unit

A. Volts per meter

B. Volts per mil

C. Amperes per meter

D. Amperes per mil

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4

At parallel resonancea the currents flowing through L and C are

A. Infinite

B. Zero

C. Unequal

D. Equal

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4

Another term of the quality factor of the resonant circuit.

A. Figure of merit

B. Figure of demerit

C. Noise factor

D. Noise figure

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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