ECAT Pre Engineering Physics Chapter 16 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 16 Alternating Current

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 16 Alternating Current

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Physics ECAT Pre Engineering Chapter 16 Alternating Current

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Question # 1

In which of the following components, pn-junction is used

Question # 2

In half wave rectification

Question # 3

The bridge circuit of full wave rectification uses

Question # 4

To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance

Question # 5

Conversion of alternating current into direct current is called

Question # 6

The open loop gain of OP-AMP is of the order of

Question # 7

OP-AMP has the following input terminals

Question # 8

Alternating current is produced by a voltage source which polarity:

Question # 9

A signal is amplified at the output without any change of phase, if it is applied at the

Question # 10

The Instantaneous value of alternative current maybe:

Question # 11

The closed loop gain of the non-inverting amplifier is given by

Question # 12

In a normally biased n-p-n transistor, an electron c current IEflows from the

Question # 13

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

Question # 14

An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is

Question # 15

The total reactance of a series RLC circuit at resonance is

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 Nowadays, Most of the electric energy is produced by the A.C. generators using:
A. Hydal water
B. Geothermal energy
C. Solar energy
D. Biomass
2 Alternating current can induce voltage because it has a
A. High peak value
B. Varying magnetic field
C. Stronger field than direct curren
D. Constant magnetic field
3 A P-N juction or semiconductor diode cannot be used as
A. A rectifier
B. Detector
C. Oscillator
D. An amplifier
4 Peak value of alternative current is:
A. one of its Instantaneous value
B. Equal to its RMS value
C. The same as its peak-to-peak value
D. Both (B) and (C)
5 A diode characteristic curve is a plot between
A. current and time
B. voltage and time
C. voltage and current
D. forward voltage and reversed voltage
6 At higher frequency of the alternating current, the capacitive reactance Xc
A. Increases
B. Decreases
C. Remains the same
D. Increases only when the voltage increases
7 The highest value reached by the voltage or current:
A. In quarter cycle is called Instantaneous value
B. In half cycle is called peak-to-peak value
C. In one cycle is called peak value
D. In half cycle is called Instantaneous value
8 The R1= infinity and R2= 0, then the gain of non-inverting amplifier is
A. zero
B. infinity
C. one
D. any one of these
9 Average value of A.C voltage during one cycle is
A. 1
B. Zero
C. Maximum
D. Variable
10 When either L or C is increased, the resonant frequency of the RLC series circuit
A. Increases
B. Decreases
C. Remains the same
D. Becomes zero

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