Question # 1

If 250V is the RMS value of alternative voltage, then its peak value V_owill be:

Choose an answer

353.5V

250V

175V

zero

400V

In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.

Choose an answer

photo diode

light emitting diode

photo voltaic cell

all of them

The r.m.s. value of alternating current is equal to its maximum value at angle of

Choose an answer

60°

45°

30°

90°

The closed loop gain of the inverting amplifier is written as

Choose an answer

G = R₂/R₁

G = 1 + R₂/R₁

G = -R₂/R₁

G = 1 - R₂/R₁

The impedance of RLC series resonance circuit at resonant frequency is

Choose an answer

Greater than R

Equal to R

Less than R

None of these

Which of the following diodes can operate in the reverse biased condition

Choose an answer

photo diode

light emitting diode

photo voltaic cell

none of these

The basic circuit elements of A.C circuit are

Choose an answer

Resistor

Inductor

Capacitor

All the three

In a normally biased n-p-n transistor, an electron c current I_Eflows from the

Choose an answer

emitter into the base

collector into the base

base into collector

none of these

An A.C. voltage is applied across the inductor. When the frequency of the voltage is increased, the current

Choose an answer

Decreases

Increases

Does not change

Momentarily goes to zero

The device which allows only the flow of an A.C. through a circuit is

Choose an answer

Capacitor

Inductor

D.C. motor

Battery

At resonance, the phase angle for RLC series resonance circuit equals

Choose an answer

0°

90°

180°

270°

Which one of the following waves belongs to electromagnetic spectrum

Choose an answer

Radio and TV waves

Radar waves

Micro waves

All of them

To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance

Choose an answer

5.07 pF

50 pF

0.507 pF

507 pF

A signal is amplified at the output without any change of phase, if it is applied at the

Choose an answer

inverting input

non-inverting input

at any of the input

none of these

The entire wave form of sinusoidal voltage is actually a set of all the:

Choose an answer

Positive maximum value + V_oand negative maximum value -V_o

Posiotive maximum value +V_oand zero

Zero and negative maximum value -V_o

Any of these

None of these

The power factor of resonant series circuit is

Choose an answer

1

0

-1

0.5

An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is

Choose an answer

3525.0 volts

35.35 volts

353.5 volts

3.535 volts

Alternating current can induce voltage because it has a

Choose an answer

High peak value

Varying magnetic field

Stronger field than direct curren

Constant magnetic field

OP-AMP has the following input terminals

Choose an answer

one

two

three

four

Alternating current can be transmitted:

Choose an answer

To long distance

At very high cost

At very low cost

Both (A) and (C)

Both (A) and (B)

More Classes

Other Links

ECAT Pre General Science Physics Chapter 16 Alternating Current Online Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer