250+ TOP MCQs on0 1P-Diode Rectifier HW-2 and Answers

Power Electronics Multiple Choice Questions on “1-Phase-Diode Rectifiers HW-2”.

1. A 1-phase 230V, 1KW heater is connected across a 1-phase HW rectifier (diode baseD.. The power delivered to the heater is
A. 300 W
B. 400 W
C. 500 W
D. 600 W

Answer: C
Clarification: R = (230 x 230)/1000
V(rms) = (√2 x 230)/2
P = V(rms)2/R = 500W.

2. A 1-phase half wave diode rectifier with R load, has input voltage of 240 V. The input power factor is
A. Unity
B. 0.707 lag
C. 0.56 lag
D. 0.865 lag

Answer: C
Clarification: Input p.f = V(rms)/Vs
Vrms is the RMS value of output voltage. Vrms = (√2 x 230)/2
Vs = 230
pf = 0.707.

3. A 1-phase half wave diode rectifier with R = 1 KΩ, has input voltage of 240 V. The diode peak current is
A. Zero
B. 240mA
C. 24mA
D. 0.24mA

Answer: B
Clarification: Diode peak current = peak current through the load = Vo/R = Vm/2R.

4. For a single phase half wave rectifier, the rectifier efficiency is always constant & it is
A. 4/π2
B. 8/π2
C. 100
D. 2/π2

Answer: A
Clarification:
Rectifier efficiency = Pdc/Pac
Pdc = (Vm x Im)/π2
Pac = 4/(Vm x Im).

One thought on “250+ TOP MCQs on0 1P-Diode Rectifier HW-2 and Answers

  1. good afternoon team am a Ugandan perusing a certificate in electrical installation, kindly can you be in position to send me some notes of the syllabus

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