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

Average value of A.C voltage during one cycle is

Question # 2

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

Question # 3

The Instantaneous value of alternative current maybe:

Question # 4

In half wave rectification

Question # 5

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

Question # 6

For normal operation of transistor, the batteries

Question # 7

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

Question # 8

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

Question # 9

The value of output resistance of OP-AMOP is of the order of

Question # 10

During each cycle, alternating voltage reaches a peak value

Question # 11

The phase angle of a series RLC circuit at resonance is

Question # 12

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

Question # 13

A signal appears after amplification, at the output terminal with a phase shift of 180° , if it is applied at

Question # 14

When the pn-junction is in reversed biased, current flows through the junction due to the

Question # 15

Chock consumes externally small

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 SI unit of impedance is
A. hertz
B. henry
C. ampere
D. ohms
2 The sum of positive and negative peak values is called:
A. Instantaneous value
B. Peak value
C. Rms valuie
D. Peak-to peak-value
3 At resonance, the phase angle for RLC series resonance circuit equals
A. 0°
B. 90°
C. 180°
D. 270°
4 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
5 If we connect a A.C. volt meter to read A.C. voltage, It would read its:
A. RMS value
B. Instantaneous value
C. Valued average over a cycle
D. Zero
6 In an A.C circuit with resistor only, the current and voltage have a phase angle of
A. 90°
B. 0°
C. 180°
D. none of these
7 For normal operation of transistor, the batteries
A. VCCis of much lower value than VBB
B. VCCis of much higher value than VBB
C. VCC is equal toVBB
D. none of these
8 The impedance of RLC series resonance circuit at resonant frequency is
A. Greater than R
B. Equal to R
C. Less than R
D. None of these
9 The most common source of alternating voltage is:
A. Motor
B. Transformer
C. AC genrator
D. Both (A) and (C)
10 The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its
A. Icwill decrease
B. VCEwill increase
C. ICwill increase
D. VCCwill increase

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