Question # 1

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 basic circuit elements of A.C circuit are

Choose an answer

Resistor

Inductor

Capacitor

All the three

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

Average value of A.C voltage during one cycle is

Choose an answer

1

Zero

Maximum

Variable

The phase angle of a series RLC circuit at resonance is

Choose an answer

180°

90°

0°

None of the these

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

At resonance frequency the impedance of parallel resonance circuit is

Choose an answer

Maximum

Minimum

Zero

None of the above

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

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)

If the value of C in a series RLC circuit is increased, the resonant frequency

Choose an answer

Is not affected

Increase

Remains the same

Decreases

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

Electromagnetic waves transmit energy equal to

Choose an answer

1/2 mv²

m_oc²

hf/c

hf

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

Which of the following diode is used to derive the current in external circuit when light is incident in the circuit

Choose an answer

photo diode

light emitting diode

photo voltaic cell

none of these

The length of rotating vector (on a certain scale) represents the:

Choose an answer

Peak value of alternating quantity

RMS value of alternating quantity

Instantaneous value of alternating quantity

Either (B) or (C)

Either (A) or (B)

If we connected the ordinary DC ammeter to measure alternating current, it would measure its:

Choose an answer

Instantaneous value

RMS value

Value averaged over a cycle

Either (B) or (C)

Either (A) or (C)

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

Choose an answer

Reverses

Increases

Decreases

Stops

Which of the following has a great concentration of impurity

Choose an answer

base

emitter

collector

none of these

At resonance, the impedance of RLC series circuit is

Choose an answer

Maximum

Zero

Minimum

Determinate

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