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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

Correct Answer :

A. Volt-ampere


Related Questions

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If the capacitance of mica capacitor is 5 times the capacitcitora then the relative permittivity of mica is

A.

B.

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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 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

The reciprocal of a complex number is

A. A complex number

B. A real number

C. An imaginary number

D. A whole number

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A capacitor opposes change in

A. Voltage

B. Current

C. Voltage and current

D. Neither voltage nor current

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Conventional flow assumes charges flow from

A. Positive to negative

B. Positive to positive

C. Negative to positive

D. Negative to negative

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Another term for superconductor.

A. Generic conductor

B. Ultraconductor

C. Cryotron

D. Cryogenic conductor

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Which of the following capacitors has the highest cost per F?

A. Plastic

B. Air

C. Mica

D. Electrolytic

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In an inductive coila the rate of rise of current is maximum

A. Near the final maximum value of current

B. At midvalue of current

C. At half-power points

D. After one time constant

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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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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

If voltage across the plates of 2 F capacitor is increased by 4 Va then charge on the plates will

A. Decrease by 2 C

B. Increase by 2 C

C. Decrease by 4 C

D. Increase by 4C

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4

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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In calculating maximum instantaneous power ___ voltage or current is used.

A. Peak

B. Average

C. Rms

D. Instantaneous

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An inductor carries 2 A dc. If its inductance is 100 Ha then what is its inductive reactance?

A. Zero

B. 1.3 k

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4

The ratio between the reactive power and the apparent power of an ac load is called

A. Quality factor

B. Power factor

C. Power ratio

D. Reactive power

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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 of the following is not a factor affecting dielectric strength?

A. Mass

B. Moisture content

C. Temperature

D. Thickness

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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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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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The hot resistance of an incandescent lamp is about ___ times its cold resistance.

A.

B.

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

A. Current magnification factor

B. Voltage magnification factor

C. Load factor

D. Leakage factor

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A three-by-threea series-parallel matrix of resistorsa all having the same ohmic valuea would have a net resistance of

A. One-third the value of a single resistor

B. Three times the value of a single resistor

C. The same value as a single resistor

D. Nine times the value of a single resistor

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4

A capacitor requires 12 C of charge to raise its potential of 3 V. What is the capacitance of the capacitor?

A. 36 F

B. 15 F

C. 0.25 F

D. 4 F

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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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Which of the following is a way of decreasing mutual inductance?

A. Moving the coils closer

B. Moving the coils apart

C. Decreasing the number of turns of either coil

D. Increasing the number of turns of either coil

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

A. Air

B. Barium-strontium titanite

C. Mica

D. Electrolyte

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The power factor of a circuit is equal to

A. RZ

B. XC/Z

C. XL/Z

D. R/Z

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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