Question # 1

In frequency modulation (FM), the carrier waves amplitude

Choose an answer

Remains constant

Increase

Decreases

None of these

Due to the high value of the input resistance, practically, the value of the current which flows between the input terminals is

Choose an answer

zero

small

large

very large

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)

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)

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

A digital system deals with quantities or variables which have

Choose an answer

only one state

only two discrete states

three discrete states

four discrete states

The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its

Choose an answer

I_cwill decrease

V_CEwill increase

I_Cwill increase

V_CCwill increase

The magnitude of alternative voltage V:

Choose an answer

Always increase

Always decrease

Remains constant

Does not remain constant

None of these

Alternating current is produced by a voltage source which polarity:

Choose an answer

Remains the same

Reverse after period T

Keeps on reversing with time

Reverse after every time interval T/2

Both (C) and (D)

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

At resonance frequency the impedance of parallel resonance circuit is

Choose an answer

Maximum

Minimum

Zero

None of the above

A P-N juction or semiconductor diode cannot be used as

Choose an answer

A rectifier

Detector

Oscillator

An amplifier

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

A sinusoidally alternating voltage or current can be graphically represented by a:

Choose an answer

Vector

Rotating vector

Clockwise vector

Anticlockwise voltage vector

None of these

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

In a transistor, if the central region is p-type then this type of transistor is known as

Choose an answer

p-n-p transistor

n-p-n transistor

either of these

none of these

More Classes

Other Links

ECAT 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