Question 21 : In case of an L filter, the ripple current increases with
1. increase in Load
2. decrease in Load
3. increase in the value of L
4. ripple current never increases
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Question 22 : An L filter is connected ________
1. in series
2. in parallel
3. in both series and parallel
4. none of the mentioned
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Question 23 : A load of R = 60 Ω is fed from 1phase, 230 V, 50 Hz supply through a step-up transformer & than a diode. The transformer turns ratio = 2. The power delivered to the load is
1. 614 Watts
2. 714 Watts
3. 814 Watts
4. 914 Watts
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Question 24 : A 3-phase bridge rectifier, has the average output voltage as 286.48 V. Find the maximum value of line voltage
1. 100 V
2. 200 V
3. 300 V
4. 400 V
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Question 25 : The current ripple factor (CRF) is the ratio of
1. Average value/RMS value
2. RMS value/Average value
3. Average value/Maximum value
4. Maximum value/RMS value
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Question 26 : In a three-phase half wave diode rectifier using 3 diodes, each diode conducts for
1. 90 degrees
2. 120 degrees
3. 180 degrees
4. 360 degrees
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Question 27 : A single-phase diode B-2 rectifier is fed from a 250 V, 50 Hz source & connected to a load of R = 400 Ω.
Design a capacitor filter such that the ripple factor of the output voltage is less than 5 %. Find the value of the capacitance of the C filter.
1. 156.4 μF
2. 500 μF
3. 189 μF
4. 246 μF
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Question 28 : A 1-phase 230V, 1KW heater is connected across a 1-phase HW rectifier (diode based). The power delivered to the heater is
1. 300 W
2. 400 W
3. 500 W
4. 600 W
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Question 29 : In case of a C filter, the AC is not allowed to pass to the load by
1. offering it high impedance
2. offering it low impedance
3. short circuiting the AC component
4. open circuiting the AC component
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Question 30 : In a 1-phase full wave bridge rectifier with M-2 type of connection has secondary side voltage Vs = Vm sin ωt,
with R load & ideal diodes.
The expression for the rms value of the output voltage can be given by
1. Vm/π
2. Vm/√2
3. Vm
4. Vm²
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