Question # 1

In a transistor, the central region is called

Choose an answer

collector

emitter

base

none of them

When the emitter-base junction of a transistor is reverse biased, collector current

Choose an answer

Reverses

Increases

Decreases

Stops

The bridge circuit of full wave rectification uses

Choose an answer

one diode

two diode

three diode

four diode

The Instantaneous value of alternative current maybe:

Choose an answer

The same as its RMS value

Greater than its Rms value

The same as its peak value

Any of these

None of these

The circuit which is used to smooth the output voltage of the full-wave rectification is known as

Choose an answer

transformer

rectifier

filter

none of these

The output voltage of half wave rectification is in the form of

Choose an answer

a smooth curve

a smooth wave

pulses

all of the above

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

Mathematical manipulation of the two quantized states can be best carried if they are represented by

Choose an answer

high - low

yes - no

on - off

0 - 1

During each cycle, alternating voltage reaches a peak value

Choose an answer

One time

Two times

Four times

A number of times depending on the frequency

The time interval during which the Voltage source changes its polarity once is known as:

Choose an answer

Time period T

Half the time period

Quarter the time period

Two third of the time period

None of these

Nowadays, Most of the electric energy is produced by the A.C. generators using:

Choose an answer

Hydal water

Geothermal energy

Solar energy

Biomass

Both (B) and (D)

The input resistance of the OP-AMP is the resistance between the

Choose an answer

(-) input and output

(+) input and output

(-) and (+) inputs

between any inputs

Which of the following has a great concentration of impurity

Choose an answer

base

emitter

collector

none of these

When the pn-junction is in reversed biased, current flows through the junction due to the

Choose an answer

majority carriers

minority carriers

either of them

none of them

The phase angle of a series RLC circuit at resonance is

Choose an answer

180°

90°

0°

None of the these

In frequency modulation (FM), the carrier waves amplitude

Choose an answer

Remains constant

Increase

Decreases

None of these

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

When the p-n junction is forward biased its resistance is of the order of

Choose an answer

few mega ohms

few kilo ohms

few ohms

few milli ohms

At resonance frequency the impedance of parallel resonance circuit is

Choose an answer

Maximum

Minimum

Zero

None of the above

The amplifier which us used to perform mathematical operations electronically is known as

Choose an answer

calculator

OP-AMP

computer

any one of them

The open loop gain of OP-AMP is of the order of

Choose an answer

10²

10³

10⁴

10⁵

The wave form of alternating voltage is the graph between:

Choose an answer

Voltage across X-axis and time across y-axis

Current and time

Voltage along y-axis and time along x-axis

Voltage and current

Either (B) or (D)

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

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

Choose an answer

60°

45°

30°

90°

Peak value of alternative current is:

Choose an answer

one of its Instantaneous value

Equal to its RMS value

The same as its peak-to-peak value

Both (B) and (C)

None of these

The waveform of alternating voltage is a:

Choose an answer

Square

Rectangular

Saw-tooth

Sinusoidal

None of these

In n-p-n transistor, emitter base junction is kept

Choose an answer

reversed

forward biased

may be reversed or may be forward biased

none of these

The phase at the positive peak of an A.C. cycle is:

Choose an answer

0º

90º

180º

0 andᏘ

Ꮨ/2 and 3Ꮨ/2

The alternative voltage of current is actually measured by:

Choose an answer

Its RMS value

Square root of its mean square value

Instantaneous value

Peak value

Both (A) and (B)

In an A.C circuit with resistor only, the current and voltage have a phase angle of

Choose an answer

90°

0°

180°

none of these

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

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

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