Question # 1

For the normal operation of the transistor, its

Choose an answer

emitter-base and collector base junctions are forward biased

emitter-base junction is reversed biased and collector base junction is forward biased

emitter-base junction is forward biased and collector-base junction is reverse biased

any one of these

The magnitude of alternative voltage V:

Choose an answer

Always increase

Always decrease

Remains constant

Does not remain constant

None of these

When either L or C is increased, the resonant frequency of the RLC series circuit

Choose an answer

Increases

Decreases

Remains the same

Becomes zero

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 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

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

Choose an answer

A rectifier

Detector

Oscillator

An amplifier

At higher frequency of the alternating current, the capacitive reactance X_c

Choose an answer

Increases

Decreases

Remains the same

Increases only when the voltage increases

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

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

In half wave rectification

Choose an answer

both halves of the input voltage is used

only one half of the input voltage is used

either of these

none of these

When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency

Choose an answer

9.4 kHz

940 kHz

94 kHz

None of these

The waveform of alternating voltage is a:

Choose an answer

Square

Rectangular

Saw-tooth

Sinusoidal

None of these

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

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

Choose an answer

n-p-n transistor

p-n-p transistor

either of these

none of these

Which of the following has a great concentration of impurity

Choose an answer

base

emitter

collector

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

The sum of positive and negative peak values is called:

Choose an answer

Instantaneous value

Peak value

Rms valuie

Peak-to peak-value

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 average of A.C. current and voltage over a complete cycle is

Choose an answer

Maximum

zero

Neither zero nor maximum

None of these

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

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