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4

What value of R is needed with a 0.05 F Cfor an RCtime constant of 0.02 s?

A.

B. 400 M

C. 400 G

D. 400 k

Correct Answer :

D. 400 k


Related Questions

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4

If resonant frequency is 10 kHz and quality factor is 50a then

A. Bandwidth is 200 Hz

B. XL= is 50a000

C. R is 50

D. XC= is 50a000

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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

What can be used to estimate resonant frequency and to find reactance at any frequency for any value of capacitor or inductor?

A. Smith chart

B. Reactance chart

C. Impedance chart

D. Resonance chart

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4

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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4

An electric circuit contains

A. Passive elements

B. Active elements

C. Both active and passive elements

D. Reactive elements

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³Any resistance R in a branch of a network in which a current I is flowing can be replaced by a voltage equal to IR�. This states

A. Compensation theorem

B. Reciprocity theorem

C. Millman�s theorem

D. Superposition theorem

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4

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

What does a capacitor store?

A. Voltage

B. Charge

C. Current

D. Power

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For multi-plate capacitora capacitance is proportional to

A. Number of plates less one(n ± 1)

B. Number of plates plus one(n + 1)

C. Number of plates less two(n - 2)

D. Number of plates (n)

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4

Which of the following is a preferred resistor value?

A.

B.

C. 43a000

D. 54a321

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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

The symbol Q refers to

A. Resonance quotient

B. Quality factor

C. Power quotient

D. Qualification test

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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

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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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

A term used to express the amount of electrical energy stored in electrostatic field.

A. Joules

B. Coulombs

C. Watts

D. Electron-volt

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A wire of one kilometre length has a resistance of 20 . If the length is halveda then the new resistance is ___ the original resistance.

A. Half

B. Twice

C. One-fourth

D. Three times

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In dividing or multiplying phasor quantitiesa ___ form is used.

A. Polar

B. Rectangular

C. Trigonometric

D. Exponential

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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

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

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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For a series ACcircuita ___ is not used as a reference phasor.

A. Voltage

B. Impedance

C. Current

D. Conductance

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The ohmic value of a resistor with negative temperature coefficient

A. Increases with increasing temperature

B. Increase with decreasing temperature

C. Stays unchanged with temperature change

D. Stays unaffected even with increasing temperature

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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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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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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 potential gradient in a cable is maximum in

A. Conductor

B. Outer sheath

C. Insulation

D. Uniformly all over

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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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What maximum voltage can be applied across the capacitor of time?

A. Working voltage

B. Surge voltage

C. Stray voltage

D. Peak voltage

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4

As applied to a series RLCcircuita bandwidth means

A. The frequency range for maximum power transfer

B. The difference between the highest and lowest frequencies of the oscillator

C. The separation of the half-power points

D. The frequency at which XL= XC