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Current Affairs January 2024

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4

What is the other name of relative permittivity?

A. Dielectric strength

B. Potential gradient

C. Breakdown voltage

D. Specific inductance capacity

Correct Answer :

D. Specific inductance capacity


Related Questions

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A coil of inductance L has an inductive reactance of XLin an ac circuit in which the effective current is I. The coil is made from a superconducting material. The rate at which power is dissipated in the coil is

A.

B. I2XL

C. IXL

D. IXL2

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4

Which of the following describes the action of a capacitor?

A. Stores electrical energy

B. Opposes changes in current flow

C. Creates a dc resistance

D. Converts ac to dc

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4

In a rectangular wavea the peak factor is

A.

B.

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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

Which of the following combination of length and cross-sectional area will give a certain volume of copper the least resistance?

A. 2L and1/2 A

B. Does not matter because the volume of copper remains the same

C. L and A

D. ½ L and 2 A

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4

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

In a pure capacitancea

A. Current leads voltage by 90�

B. Current leads voltage by 180�

C. Current lags voltage by 90�

D. Current lags voltage by 180�

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4

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

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4

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

A.

B.

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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

If an emf in circuit A produces a current in circuit Ba then the same emf in circuit Bproduces the same current in circuit ? this theorem is known as

A. Maximum power transfer theorem

B. Millman�s theorem

C. Reciprocity theorem

D. Norton�s theorem

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4

What is expected when two 20 k a 1 watt resistor in parallel are use instead of one 10 k a 1 watt?

A. Provides higher current

B. Provides less power

C. Provides more power

D. Provides wider tolerance

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4

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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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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When the net reactance in a series coil-capacitor circuit is zero at frequency fa the nature of its reactance of frequency 2f is

A. Inductive

B. Capacitive

C. Resistive

D. Infinite

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4

According to Gauss theorema flux can be equated to

A. Charge

B. Field intensity

C. Current

D. Voltage

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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

Which component opposes voltage change?

A. Resistor

B. Inductor

C. Capacitor

D. Transistor

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A factor that states how much the resistance changes for a change in temperature?

A. Resistivity

B. Specific resistance

C. Coefficient of temperature change

D. Temperature coefficient of resistance

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4

Form its definitiona the unit of electric fielda is the N/C and equivalent unit of is the

A. V(m)2

B. V(m)

C. V/m2

D. V/m

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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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4

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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When two complex conjugates are subtracteda the result is a

A. Quadrature component only

B. Complex component

C. In-phase component

D. Real component

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What is the rms value of a square wave?

A. Equals its peak value

B. Equals its peak-to-peak value

C. Peak divided by square root of two

D. Peak divided by pi

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4

High resistance values are a consequence of the ___ of the film.

A. Thickness

B. Length

C. Thinness

D. Area

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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

What is the form factor of a triangular wave?

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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4

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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4

Which statement is true?

A. A series resonant circuit is of high impedance

B. A parallel resonant circuit is of low impedance

C. A series resonant circuit is inductive if it operates at a frequency higher than the resonant frequency

D. A parallel resonant circuit is inductive if it operates at a frequency higher than the resonant frequency