MDCAT Physics mcq test with answers for chapter 14 (Electronics)

Question # 1

The efficiency of full wave rectifier is:

25.6% A
81.2% B
81.6% C
71.2% D

Question # 2

The junction potential for Germanium is;

3v A
0.3 v B
7v C
0.7 v D

Question # 3

The diodes works on

A.C A
D.C B
both A and B C
None of these D

Question # 4

In a full wave rectifier, the diode conducts during

Both halves of the input cycle A
A portion of the positive half cycle of the input B
Positive half cycle of the input C
Positive half cycle of the input D
Both halves of the input cycle E

Question # 5

When two semiconductors of p- and n-type are brought into contact, they from a p-n junction which act like a:

Conductor A
Amplifier B
Oscillator C
Rectifier D

Question # 6

The unit of gain (G) for non-inverting amplifier is

Ampere A
ohm B
Volt C
None of these D

Question # 7

A device which convert DC into AC is calleD)

Invertor A
Generator B
Rectifier C
Motor D

Question # 8

For full wave rectification, the minimum number of diodes used is:

1 A
2 B
3 C
4 D

Question # 9

In a half wave rectifier circuit operating from 50 Hz mains frequency, the fundamental frequency in the ripple would be:

25 Hz A
70.7 Hz B
50 Hz C
100 Hz D

Question # 10

For a normal AC cycle, during T/2 to T the diode act as:

Open switch A
full wave rectifier B
Close switch C
All are correct D

Question # 11

A non-conducting semiconductor diode is:

Forward biased A
Poorly biased B
Reverse biased C
None of them D

Question # 12

The power output of a full wave rectifier is:

Equal to H.W.R A
Twice of H.W.R B
Half of H.W.R C
Four times of H.W.R D

Question # 13

A diode characteristics curve is a graph plotted between;

Current and time A
Voltage and time B
Voltage and current C
Forward voltage and reverse current D

Question # 14

A non-inverting amplifier has infinite input resistance then the voltage gain of noninverting amplifier will be:

Zero A
Infinite B
One C
100 D

Question # 15

Gain of operational amplifier is independent of;

Internal structure A
External Structure B
Batteries C
Potential changes D

Question # 16

In full wave rectification, the output DC voltage across the load is obtained for.

The positive half cycle of input AC only A
The negative half cycle of input AC B
The completes cycle of input AC only C
All of the above D

Question # 17

A diode as a rectifier converts:

A)c into D)c A
D)c into A)c B
Varying D)c current into constant D)c current C
High voltage into low voltage and vice-versa D

Question # 18

The efficiency of half wave rectifier is:

25.6% A
1.2% B
40.6% C
66.6% D

Question # 19

The method by which only one half of A.C cycle is converted into direct current is called

half wave amplification A
half wave rectification B
Full wave rectification C
full wave amplification D

Question # 20

In a full wave rectifier:

DC current is twice that of half wave rectifier A
DC pulses are twice per cycle that of half wave rectifier B
DC voltage is twice that of half wave rectifier C
All are correct D

Sr.#	Question	Answer
1	The magnitude of potential barrier for Ge is	A. 0.7 v B. 0.3 V C. 7v D. 3 v
2	When two semiconductors of p- and n-type are brought into contact, they from a p-n junction which act like a:	A. Conductor B. Amplifier C. Oscillator D. Rectifier
3	A diode as a rectifier converts:	A. A)c into D)c B. D)c into A)c C. Varying D)c current into constant D)c current D. High voltage into low voltage and vice-versa
4	A non-inverting amplifier has infinite input resistance then the voltage gain of noninverting amplifier will be:	A. Zero B. Infinite C. One D. 100
5	The method by which only one half of A.C cycle is converted into direct current is called	A. half wave amplification B. half wave rectification C. Full wave rectification D. full wave amplification
6	In a full wave rectifier, the diode conducts during	A. Both halves of the input cycle B. A portion of the positive half cycle of the input C. Positive half cycle of the input D. Positive half cycle of the input
7	The simplest type of rectification known as half wave rectification is obtained by	A. Using a transistor B. Suppressing the harmonics in A.C. voltage C. Suppressing half wave of A.C. supply by using diode D. Using a Coolidge
8	The diodes works on	A. A.C B. D.C C. both A and B D. None of these
9	The efficiency of full wave rectifier is:	A. 25.6% B. 81.2% C. 81.6% D. 71.2%
10	Gain of operational amplifier is independent of;	A. Internal structure B. External Structure C. Batteries D. Potential changes

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