Question # 1

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 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

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

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

If 250V is the RMS value of alternative voltage, then its peak value V_owill be:

Choose an answer

353.5V

250V

175V

zero

400V

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)

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

The power factor of resonant series circuit is

Choose an answer

1

0

-1

0.5

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 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

OP-AMP has the following input terminals

Choose an answer

one

two

three

four

Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length

Choose an answer

X-rays

Ultraviolet rays

y-rays

Cosmic rays

Transmitting antenna emits

Choose an answer

Magnetic waves

Electric waves

Electromagnetic waves

Sound waves

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 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 basic circuit elements of A.C circuit are

Choose an answer

Resistor

Inductor

Capacitor

All the three

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

Choose an answer

0

1

low

any one of these

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

Choose an answer

0°

90°

180°

270°

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

Alternating current can be transmitted:

Choose an answer

To long distance

At very high cost

At very low cost

Both (A) and (C)

Both (A) and (B)

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

For normal operation of transistor, the batteries

Choose an answer

V_CCis of much lower value than V_BB

V_CCis of much higher value than V_BB

V_{CC is equal to}V_BB

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)

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

At resonance frequency the impedance of parallel resonance circuit is

Choose an answer

Maximum

Minimum

Zero

None of the above

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

The bridge circuit of full wave rectification uses

Choose an answer

one diode

two diode

three diode

four diode

During the negative half-cycle of the half-wave rectification, the diode

Choose an answer

does not conduct

conducts

either of these

none of these

The basic circuit element in A.C. circuits are:

Choose an answer

Resistor and capacitor

Resistor and Inductor

Capacitor only

Both (B) and (C)

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

In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.

Choose an answer

photo diode

light emitting diode

photo voltaic cell

all of them

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