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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
Q

Which has less ripple factor:

A

Full wave Rectifier

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26
Q

Ripple factor of full wave rectifier?

A

1.21

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27
Q

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;

A

Always zero

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28
Q

If input free is 50Hz for full wave rectifier, then ripple frequency will be:

A

100Hz

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29
Q

If the input voltage of input De if 10V for full wave rectifier output De voltage will be;

A

10

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30
Q

The bridge rectifier is used more than a full rectifier because:

A

➡Perfomrs on less secondary voltage
➡No centre tap transformer required
➡Power loss is minimum

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31
Q

The half wave rectifier has an input of 10V its de component is:

A

10/π

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32
Q

Half wave rectifier contains, how many diodes

A

1

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33
Q

Ripple factor of half wave rectifier?

A

1.21

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34
Q

The efficiency of a full wave rectifier?

A

81.2%

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35
Q

In peak rectifier Vp=100 and R=10KΩ f=60Hz … find the factor for which diode is conduction:

A

4.02%

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36
Q

The bridge rectifier is an alternative for:

A

Full wave rectifier

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37
Q

A rectifier is a:

A

Linear Device

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38
Q

The ripple factor indicates the number of ripples in the:

A

D.C output

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39
Q

The ripple factor is:

A

Ripple factor = √(Vrms/Vdc)^2-1

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40
Q

Rectifier circuits are:

A

SIngle-Phase

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41
Q

If peak voltage across a full wave rectifier is 20V then V r.m.s is:

A

14.14 V

42
Q

The maximum efficiency of half wave rectifier is:

A

40.60%

43
Q

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:

A

275.2 mW

44
Q

In a half-wave rectification, during the negative cycle of the wave the diode is:

A

Reversed Biased

45
Q

If a half wave rectifier is used to convert 50Hz AC into DC, then the number of pulses present in rectifier voltage is:

A

50

46
Q

Ripple factor is defined as:

A

I rms/I dc

47
Q

The bridge rectifier is prefered to an ordinary two diodes full wave rectifier because:

A

➡It needs a much smaller transformer or the same output
➡No centre tap required
➡Less PIV rating per diode

48
Q

Half wave rectifier uses:

A

One diode

49
Q

The transformer is used in rectification to ___ the supply voltage

A

Step Down

50
Q

To get a peak load voltage of 40 out of a bridge rectifier, what should be the approximate rms value of a secondary voltage?

A

56.6V

51
Q

The rectifier is a device which converts;

A

AC to DC

52
Q

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

A

3.18%

53
Q

Which of the following are components of half wave rectifier

A

➡Transformer
➡Load Resistance
➡Power supply

54
Q

The centre tap rectifier circuit consists of ___ diode.

A

2

55
Q

The output voltage of a rectifier is:

A

Pulsating

56
Q

The basic purpose of the filter is:

A

Remove ripples from the rectified output

57
Q

In a half wave rectification, the diode conducts during:

A

Positive Half

58
Q

The use of a capacitor filter in a rectifier circuit gives a satisfactory performance only when the load:

A

Current is low

59
Q

The maximum efficiency of a full wave rectifier is:

A

80.60%

60
Q

Half wave voltage multiplier can provide any degree of voltage multiplication by cascading diodes and capacitors:

A

Any Multiplication

61
Q

Ripple factor of full wave rectifier is:

A

0.482

62
Q

In half wave rectification, the output DC voltage is obtained across the load for:

A

Either positive or negative half cycle of input A.C

63
Q

A half wave rectifier is equivalent to:

A

Clipper

64
Q

Rippel factor of half wave rectifier is:

A

1.11

65
Q

the use of a capacitor filter in a rectifier circuit gives satisfactory performance only when the load

A

Current is low

66
Q

Half wave rectifier uses:

A

One Diode

67
Q

The number of diodes in the bridge rectifier is:

A

4

68
Q

In half wave rectification, the output DC voltage is obtained across the load for:

A

Either positive or negative half cycle of input AC

69
Q

A circuit that adds positive or negative dc voltage to an input sine wave is called:

A

Clamper

70
Q

In a full wave rectifier with an input frequency 50Hz the ripple in the output is mainly of frequency:

A

100Hz

71
Q

A half-wave rectifier is operating from 50Hz mains. The fundamental frequency of ripple will be;

A

50Hz

72
Q

Non-inverting amplifier circuits have:

A

A very high input impedance

73
Q

Which of the following rectifier uses Wheatstone bridge to rectify the signal;

A

Bridge

74
Q

A full wave rectifier passes ___ into positive cycles

A

Both Cycles

75
Q

In which rectifier ripple factor is less:

A

Full wave

76
Q

In a rectifier, larger the value of the shunt capacitor filter:

A

Longer the time that current pulse flows through the diode

77
Q

The average DC voltage across the load in terms of Vmax is;

A

0.637Vmax

78
Q

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:

A

Vm

79
Q

The peak voltage in the output of half wave rectifier is 10V so the dc component of the output voltage is:

A

10/π

80
Q

Conversion of alternating current into the direct current is called:

A

rectification

81
Q

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

A

Filter circuit

82
Q

In case of half wave rectification, resistance of diode during a negative half cycle of A.C is;

A

Very High

83
Q

The direction of current through the load resistance of a full-wave rectification circuit:

A

Remains constant

84
Q

In full wave rectification, the diodes are used:

A

4

85
Q

Which has less ripple factor:

A

Full wave rectifier➡0.48

86
Q

Ripple factor of full wave rectifier:

A

0.482

87
Q

If f=50Hz then in half wave no. of pulses are:

A

50

88
Q

The process in which A.C is converted into D.C is called:

A

Rectification

89
Q

the output voltage of a rectifire is;

A

Pulsating

90
Q

The specially designed semiconductor diodes used as indicator lamps in electronic circuits ar:

A

The light emitting diode

91
Q

In a PN-Junction diode:

A

The current in the reverse biased condition is generally very small

92
Q

The process n which A.C is converted into D.C is called:

A

Rectification

93
Q

In full wave rectification by bridge the numebr of diodes required are:

A

4

94
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

95
Q

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

A

The complete cycle of input A.C

96
Q

The specially designed semiconductor diodes used as indicator lamps in electronic circuits are;

A

The light emitting diode

97
Q

The voltage which appears across load resistance R is called:

A

Reverse voltage

98
Q

In a PN-Junction diode:

A

The current in the reverse biased condition is generally very small

99
Q

In the depletion region of an unbiased PN-junction diode there are:

A

Only fixed ions

100
Q

An alternating current can be converted into direct current by a:

A

Rectifier

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