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AM PHYSICS > UNIT#10 ELECTRONICS > Flashcards

UNIT#10 ELECTRONICS Flashcards

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1
Q

The applied input a.c. power to a half-wave rectifier is 100 watts. The D.C output power obtained is 40 watts. What is the rectification of efficiency?

A

40%

Efficiency= D.C Output Power/ A.C. input power x 100

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2
Q

The ripple factor indicates the number of ripples in the:

A

D.C Output

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3
Q

For a half wave or full rectifier the Peak Inverse Voltage of the rectifier is always:

A

Smaller than the input voltage

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4
Q

The device which converts A.C into D.C is called:

A

Rectifier

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5
Q

The types of rectifications are:

A

2

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6
Q

Rectification is possible by:

A

Diode

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7
Q

The semiconductor diode can be used as a rectifier because:

A

It has low resistance to the current flow when forward biased & high resistance when reverse biased

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8
Q

The simplest type of rectification known as half-wave rectification is obtained by:

A

Suppressing half wave of A.C supply by using diode

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9
Q

The output of half wave rectifier is suitable only:

A

Charging batteries

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10
Q

During the interval 0➡T/2 the forward biased diode offers:

A

Very small resistance

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11
Q

In a half wave rectifier, the frequency of the input is N, and the frequency and form of the output will be:

A

➡N

➡Pulsating

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12
Q

The most common device used as the filter is:

A

Capacitor

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13
Q

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

A

Half wave rectification

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14
Q

If the time period of input T in the full wave bridge rectifier circuit, then the time period of the pulsating current will be:

A

T/2

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15
Q

In a bridge rectifier how many diodes conduct during each half cycle of input A.C

A

2

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16
Q

If a full wave rectifier circuit is operating from 50Hz mains, the fundamental frequency in the ripple will be;

A

100Hz

In a full-wave rectifier, the frequency of the output wave is double of the input wave

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17
Q

To reduce ripples in the output of the bridge rectifier we should use:

A

A filter circuit

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18
Q

In full wave rectification, the output D.C. voltage across the load is obtained for:

A

The complete cycle of input A.C

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19
Q

The output voltage of the rectifier is not smooth. It can be made smooth by using a circuit known as;

A

Filter Circuit

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20
Q

The basic reason why a full wave rectifier has twice the efficiency of a half-wave rectifier is that:

A

It utilizes both half cycles of the input

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21
Q

If an A.C voltage of rms value of 10V is applied as input of half wave rectifier, then the rms voltage value of D.C output will be:

A

9.3V

General potential barrier of Si=0.7V

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22
Q

If a half-wave rectifier is used to convert 50Hz A.C into D.C then the number of pulses present in rectifier voltage is:

A

50

For half wave, f=f

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23
Q

The output from a full wave rectifier is:

A

➡Uni-Directional

➡Pulsating DC

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24
Q

The transformer is used in a rectifier to:

A

Step-Down Voltage

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25
Which has less ripple factor:
Full wave Rectifier
26
Ripple factor of full wave rectifier?
1.21
27
The work done by the electric field on a particle when it is moved from one point on an equipotential surface to another point on the same equipotential surface is;
Always zero
28
If input free is 50Hz for full wave rectifier, then ripple frequency will be:
100Hz
29
If the input voltage of input De if 10V for full wave rectifier output De voltage will be;
10
30
The bridge rectifier is used more than a full rectifier because:
➡Perfomrs on less secondary voltage ➡No centre tap transformer required ➡Power loss is minimum
31
The half wave rectifier has an input of 10V its de component is:
10/π
32
Half wave rectifier contains, how many diodes
1
33
Ripple factor of half wave rectifier?
1.21
34
The efficiency of a full wave rectifier?
81.2%
35
In peak rectifier Vp=100 and R=10KΩ f=60Hz ... find the factor for which diode is conduction:
4.02%
36
The bridge rectifier is an alternative for:
Full wave rectifier
37
A rectifier is a:
Linear Device
38
The ripple factor indicates the number of ripples in the:
D.C output
39
The ripple factor is:
Ripple factor = √(Vrms/Vdc)^2-1
40
Rectifier circuits are:
SIngle-Phase
41
If peak voltage across a full wave rectifier is 20V then V r.m.s is:
14.14 V
42
The maximum efficiency of half wave rectifier is:
40.60%
43
A full wave rectifier uses a load resistor of 1500Ω. Assume the diodes have Rf=10Ω, Rr=∞. The voltage applied to the diode is 30V with a frequency of 50Hz. Calculate the AC power input:
275.2 mW
44
In a half-wave rectification, during the negative cycle of the wave the diode is:
Reversed Biased
45
If a half wave rectifier is used to convert 50Hz AC into DC, then the number of pulses present in rectifier voltage is:
50
46
Ripple factor is defined as:
I rms/I dc
47
The bridge rectifier is prefered to an ordinary two diodes full wave rectifier because:
➡It needs a much smaller transformer or the same output ➡No centre tap required ➡Less PIV rating per diode
48
Half wave rectifier uses:
One diode
49
The transformer is used in rectification to ___ the supply voltage
Step Down
50
To get a peak load voltage of 40 out of a bridge rectifier, what should be the approximate rms value of a secondary voltage?
56.6V
51
The rectifier is a device which converts;
AC to DC
52
Consider a peak rectifier fed by a 60-Hz sinusoid having a peak value of Vp100V, Let the load resistance R=10kΩ. Calculate the fraction of the cycle during which the diode is conduction
3.18%
53
Which of the following are components of half wave rectifier
➡Transformer ➡Load Resistance ➡Power supply
54
The centre tap rectifier circuit consists of ___ diode.
2
55
The output voltage of a rectifier is:
Pulsating
56
The basic purpose of the filter is:
Remove ripples from the rectified output
57
In a half wave rectification, the diode conducts during:
Positive Half
58
The use of a capacitor filter in a rectifier circuit gives a satisfactory performance only when the load:
Current is low
59
The maximum efficiency of a full wave rectifier is:
80.60%
60
Half wave voltage multiplier can provide any degree of voltage multiplication by cascading diodes and capacitors:
Any Multiplication
61
Ripple factor of full wave rectifier is:
0.482
62
In half wave rectification, the output DC voltage is obtained across the load for:
Either positive or negative half cycle of input A.C
63
A half wave rectifier is equivalent to:
Clipper
64
Rippel factor of half wave rectifier is:
1.11
65
the use of a capacitor filter in a rectifier circuit gives satisfactory performance only when the load
Current is low
66
Half wave rectifier uses:
One Diode
67
The number of diodes in the bridge rectifier is:
4
68
In half wave rectification, the output DC voltage is obtained across the load for:
Either positive or negative half cycle of input AC
69
A circuit that adds positive or negative dc voltage to an input sine wave is called:
Clamper
70
In a full wave rectifier with an input frequency 50Hz the ripple in the output is mainly of frequency:
100Hz
71
A half-wave rectifier is operating from 50Hz mains. The fundamental frequency of ripple will be;
50Hz
72
Non-inverting amplifier circuits have:
A very high input impedance
73
Which of the following rectifier uses Wheatstone bridge to rectify the signal;
Bridge
74
A full wave rectifier passes ___ into positive cycles
Both Cycles
75
In which rectifier ripple factor is less:
Full wave
76
In a rectifier, larger the value of the shunt capacitor filter:
Longer the time that current pulse flows through the diode
77
The average DC voltage across the load in terms of Vmax is;
0.637Vmax
78
In a bridge-type full wave rectifier, if Vm is the peak voltage across the secondary of the transformer, the maximum voltage coming across each reverse biased diode is:
Vm
79
The peak voltage in the output of half wave rectifier is 10V so the dc component of the output voltage is:
10/π
80
Conversion of alternating current into the direct current is called:
rectification
81
The output voltage of the rectifier is not smooth. It can be made smooth by using a circuit known as;
Filter circuit
82
In case of half wave rectification, resistance of diode during a negative half cycle of A.C is;
Very High
83
The direction of current through the load resistance of a full-wave rectification circuit:
Remains constant
84
In full wave rectification, the diodes are used:
4
85
Which has less ripple factor:
Full wave rectifier➡0.48
86
Ripple factor of full wave rectifier:
0.482
87
If f=50Hz then in half wave no. of pulses are:
50
88
The process in which A.C is converted into D.C is called:
Rectification
89
the output voltage of a rectifire is;
Pulsating
90
The specially designed semiconductor diodes used as indicator lamps in electronic circuits ar:
The light emitting diode
91
In a PN-Junction diode:
The current in the reverse biased condition is generally very small
92
The process n which A.C is converted into D.C is called:
Rectification
93
In full wave rectification by bridge the numebr of diodes required are:
4
94
The simplest type of rectification known as half wave rectification is obtained by
Suppressing half wave of A.C supply by using diode
95
In full wave rectiication, the output D.C voltage across the load obtained for:
The complete cycle of input A.C
96
The specially designed semiconductor diodes used as indicator lamps in electronic circuits are;
The light emitting diode
97
The voltage which appears across load resistance R is called:
Reverse voltage
98
In a PN-Junction diode:
The current in the reverse biased condition is generally very small
99
In the depletion region of an unbiased PN-junction diode there are:
Only fixed ions
100
An alternating current can be converted into direct current by a:
Rectifier

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