Question 1 : The rectification efficiency for B-2 type & M-2 type full wave diode rectifiers are ___ & ___ respectively.
1. 8/π & 4/π
2. 4/π & 8/π
3. 8/π & 8/π
4. 4/π & 4/π
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Question 2 : For a single phase half wave rectifier, with R load, the diode is reversed biased from ωt =
1. 0 to π, 2π to 2π/3
2. π to 2π, 2π/3 to 3π
3. π to 2π, 2π to 2π/3
4. 0 to π, π to 2π
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Question 3 : A 3-phase bridge rectifier charges a 240-V battery. The rectifier is given a 3-phase 230 V supply. The current limiting resistance in series with the battery is 8 Ω.
Find the power delivered to the battery (Pdc).
1. Pdc = 2000 W
2. Pdc = 1226 W
3. Pdc = 2356 W
4. Pdc = 2116 W
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Question 4 : In practice the output from the diode rectifier has
1. AC component only
2. DC component only
3. AC + DC component
4. None of the mentioned
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Question 5 : For a 3-phase 6-pulse diode rectifier, has Vml as the maximum line voltage value on R load. The peak current through each diode is
1. Vml/2R
2. 2Vml/R
3. Vml/R
4. Insufficient Data
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Question 6 : In the process of diode based rectification, the alternating input voltage is converted into
1. an uncontrolled alternating output voltage
2. an uncontrolled direct output voltage
3. a controlled alternating output voltage
4. a controlled direct output voltage
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Question 7 : For a single phase, full bridge, diode rectifier excited from a 230 V, 50 Hz source. With R = 10 Ω & the inductance(L) large enough to maintain continuous conduction, the value of the supply power factor will be
1. 0.707 lag
2. 0.9 lag
3. 0.86 lag
4. Unity
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Question 8 : For a certain diode based rectifier, the output voltage (average value) is given by the equation
1/2π [ ∫Vm sin ωt d(ωt) ]Where the integral runs from 0 to π
The rectifier configuration must be that of a
1. single phase full wave with R load
2. single phase full wave with RL load
3. single phase half wave with R load
4. single phase half wave with RL load
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Question 9 : A 1-phase half wave diode rectifier with R = 1 KΩ, has input voltage of 240 V. The diode peak current is
1. Zero
2. 240mA
3. 24mA
4. 0.24mA
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Question 10 : The PIV experienced by the diodes in the mid-point type configuration is
1. Vm
2. 2Vm
3. 4Vm
4. Vm/2
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