Question # 1

The total reactance of a series RLC circuit at resonance is

Choose an answer

zero

Equal to the resistance

Infinity

Capacitive

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

Which one of the following is correct?

Choose an answer

V_o= 1.414 V_rms

I_ams= 1.414 I_o

VO = 10.70 Vrms

Both a and b

Average value of A.C voltage during one cycle is

Choose an answer

1

Zero

Maximum

Variable

When the pn-junction is connected reversed biased, its resistance is of the order of

Choose an answer

few ohms

few kilo-ohms

few mega-ohms

few mili-ohms

The most common source of alternating voltage is:

Choose an answer

Motor

Transformer

AC genrator

Both (A) and (C)

Both (A) and (B)

In series RC circuit when R=X_c, then the phase angle is

Choose an answer

0°

90°

70°

45°

A changing magnetic flux creates around itself

Choose an answer

An electromotive force

An electric field (changing electric flux)

Magnetic field

None of the above

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

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

Choose an answer

0°

90°

180°

270°

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 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

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

For a n-p-n transistor, the conventional current equation can be written as

Choose an answer

I_E+ I_C= I_B

I_C- I_B= I_E

I_C+ I_B= I_E

I_B+ I_E= I_C

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

In a transistor, the central region is called

Choose an answer

collector

emitter

base

none of them

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 power factor of resonant series circuit is

Choose an answer

1

0

-1

0.5

During the positive half-cycle in the half-wave rectification,the diode

Choose an answer

does not conduct

conducts

either of these

neither of these

A resonance curve for RLC series circuit is a plot of frequency versus

Choose an answer

Voltage

Current

Impedance

Reactance

Chock consumes externally small

Choose an answer

Charge

Current

Power

Potential

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

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

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 RMS value of alternating current is:

Choose an answer

0.7 times at the peak value

0.5 times the peak value

0.7 times the Instantaneous value

Equal to maximum voltage

None of these

SI unit of impedance is

Choose an answer

hertz

henry

ampere

ohms

The highest value reached by the voltage or current:

Choose an answer

In quarter cycle is called Instantaneous value

In half cycle is called peak-to-peak value

In one cycle is called peak value

In half cycle is called Instantaneous value

None of these

In describing functions of digital systems, a closed switch will be shown as

Choose an answer

0

1

low

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

Choose an answer

0º

90º

180º

0 andᏘ

Ꮨ/2 and 3Ꮨ/2

Electromagnetic waves transmit energy equal to

Choose an answer

1/2 mv²

m_oc²

hf/c

hf

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