Home
Current Affairs January 2024

What is the correct answer?

4

If a coil has a Q of 10a it means that

A. The energy stored in the magnetic field of the coil is 10 times the energy wasted in its resistance

B. The energy wasted in its resistance is 10 times the energy stored in the magnetic field of the coil

C. It is a low Q coil

D. It is a high Q coil

Correct Answer :

A. The energy stored in the magnetic field of the coil is 10 times the energy wasted in its resistance


Related Questions

What is the correct answer?

4

The ratio of W/VA in an ac circuit means

A. Power factor

B. Reactive factor

C. Quality factor

D. Load factor

What is the correct answer?

4

The temperature coefficient of resistance of electrolytes is

A. Negative

B. Positive

C. Zero

D. Infinite

What is the correct answer?

4

Norton�s theorem is what form of an ac equivalent circuit?

A. Voltage

B. Current

C. Both voltage and current

D. Neither voltage nor current

What is the correct answer?

4

Series resonance occurs when

A. XL= XC

B. XL= R

C. Z = R

D. Both A and C

What is the correct answer?

4

The capacitor opposes any change in voltage across it by

A. Passing a voltage proportional to the rate of change of current

B. Acting as a short circuit at time equal to zero

C. Passing a current proportional to the rate of change of voltage

D. Acting as a short circuit at time equal to infinity

What is the correct answer?

4

Voltage resonance means

A. Series resonance

B. Parallel resonance

C. Current magnification

D. Gain magnification

What is the correct answer?

4

A 0.09 microfarad capacitor is charged to 220 volts. How long in milliseconds will it discharged resistor has a resistance of 20a000 ohms?

A.

B.

What is the correct answer?

4

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

What is the correct answer?

4

What is the resonant frequency of a circuit when L of 3 microhenrys and C of 40 picofarads are in series?

A. 14.5 kHz

B. 145 MHz

C. 14.5 MHz

D. 145 kHz

What is the correct answer?

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

What is the correct answer?

4

A series RLCcircuit has a ______ power factor at its half-power points

A. Unity

B. Leading

C. Lagging

D. Either B or C

What is the correct answer?

4

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

A.

B.

What is the correct answer?

4

Liquids that are good conductors because of ionization are called

A. Electrolytic

B. Bases

C. Acid

D. Electrolytes

What is the correct answer?

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

What is the correct answer?

4

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

What is the correct answer?

4

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

A. Paper

B. Mica

C. Air

D. Electrolyte

What is the correct answer?

4

In adding or subtracting phasor quantitiesa ___ form is the most convenient.

A. Polar

B. Rectangular

C. Trigonometric

D. Exponential

What is the correct answer?

4

The admittance of a parallel RLC circuit is found to be the ___ sum of conductance and susceptances.

A. Algebraic

B. Arithmetic

C. Vector

D. Phasor

What is the correct answer?

4

What is the peak factor for alternating current or voltage varying sinusiodally?

A.

B.

What is the correct answer?

4

For a triangular and sawtooth waveform the rms voltage or current equals

A. 0.707times peak value

B. 0.577 times peak value

C. 0.577times average value

D. 0.707times rms value

What is the correct answer?

4

What fusion of elements is without chemical action between them?

A. Mixture

B. Compound

C. Alloy

D. Ionization

What is the correct answer?

4

What is the efficiency under the conditions of maximum power transfer?

A.

B.

What is the correct answer?

4

Loop currents should be assumed to flow in which direction

A. Straight

B. Clockwise

C. Counter-clockwise

D. Either B or C arbitrarily selected

What is the correct answer?

4

In an ac circuita the power dissipated as heat depends on

A. Impedance

B. Capacitive reactance

C. Resistance

D. Inductive reactance

What is the correct answer?

4

Which of the following conditions is not true for a series RLCcircuit at resonance?

A. Z = jXL

B. XL= XC

C. The power factor is one

D. The magnitude of Z is

What is the correct answer?

4

Barium-strontium titanite dielectric material is also called

A. Ceramic

B. Polyster

C. Electrolytic

D. Bakelite

What is the correct answer?

4

What is the hot resistance of a 100 Wa 220 V incandescent lamp?

A.

B.

What is the correct answer?

4

What is the temperature coefficient of the resistance Eureka?

A. Infinity

B. Negative

C. Almost zero

D. Positive

What is the correct answer?

4

The average value of a triangular or sawtooth wave is _____ times its peak value.

A.

B.

What is the correct answer?

4

Electron flow assumes charges flow from

A. Negative to positive

B. Negative to negative

C. Positive to negative

D. Positive to positive