WorksheetsS-4_Fundamentals of Automobile Electrical & Electronics Engg
Total questions: 22
Worksheet time: 17mins
What is the Ripple factor of a fullwave rectifier ?
0.48
0.31
0.707
1.414
If the peak applied signal voltage is Vm, then for a full wave rectifier circuit(not bridge) the PIV of the diodes should be
≥2Vm
<2Vm
≥Vm
< Vm
The process of converting the AC current into DC current is called...
Filtering
Rectification
Smoothing
Step-down
This circuit is ...
series circuit
half-wave rectifier
full-wave rectifier
diode breakdown
Calculate the Vpeak out
20 Vac
19.3 Vpeak
19.3 V
20 V
Which image shows the output of a sine-wave after it has gone through a diode? (Half-wave rectified)
The function of rectifier is
To increase or decrease the AC voltage in a circuit
Converting the AC voltage into pulse DC voltage
Smooth out the ripple contained in the pulses of pulse DC voltage
Maintain a constant DC voltage output across a load
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 efficiency ?
40%
60%
80%
90%
Efficiency of a centre tapped full wave rectifier is _________
a) 50%
b) 46%
c) 70%
d) 81.2%
50%
46%
70%
81.2%
If input frequency is 50Hz for a full wave rectifier, the ripple frequency of it would be _________
100Hz
50Hz
25Hz
500Hz
If the peak voltage on a centre tapped full wave rectifier circuit is 5V and diode cut in voltage is 0.7. The peak inverse voltage on diode is_________
4.3V
9.3V
5.7V
10.7V
The ripple factor of a bridge rectifier is
0.482
0.8l2
l.ll
1.21
A bridge rectifier is preferable to an ordinary two-diode full-wave rectifier because
It needs much smaller transformer for the same output.
It uses four diodes.
Its transformer does not require center-tap.
None of the above.
What is the main advantage of using a digital storage oscilloscope?
uses digital storage
uses analog storage
uses mixed mode storage
uses disc storage
Peak to peak voltage is given by
number of units x (1/division)
volts/division
number of units x volts
number of units x (volts/division)
Diagram shows a waveform displayed on the screen of a C.R.O. If the controls on the C.R.O. are set at 0.5 V/div and 2 ms/div, find the peak voltage and the frequency of the input signal.
4 V, 2 Hz
5 V, 10 Hz
2 V, 100 Hz
4 V, 100 Hz
X-Y mode means ____________
2 modes
vertical and horizontal
x axis and y axis
ground and full line supply
Period of a waveform is obtained by which of the following relation?
T = number of divisions occupied by 1 cycle×(time)
T = number of divisions occupied by 1 cycle×(1⁄division)
T = number of divisions occupied by 1 cycle×(time⁄division)
T = number of divisions occupied by 1 cycle
By making use of a CRO / DSO _________
many characteristics of a signal can be measured
only a few characteristics of a signal can be measured
no characteristics of a signal can be measured
signal can only be displayed
In the circuits given below, the correct full wave rectifier is _________
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