Question 41 : A step-down delta-star transformer, with per-phase turns ratio of 5 is fed from a 3-phase 1100 V source. The secondary of this transformer is connected through a 3-pulse type rectifier, which is feeding an R load.
The power delivered to the load is 6839.3 Watts.
The maximum value of the load current is √2 x 22 A.
Fin, the rms value of output voltage Vo (rms)
1. 257.3 V
2. 220 V
3. 261.52 V
4. 248.32 V
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Question 42 : 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 average value of the output voltage can be given by
1. 2Vm/π
2. Vm/π
3. Vm/√2
4. 2Vm/√2
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Question 43 : A single-phase full wave mid-point type diode rectifier requires __________ number of diodes whereas bridge type requires _________
1. 1,2
2. 2,4
3. 4,8
4. 3,2
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Question 44 : For a single phase half wave rectifier, the rectifier efficiency is always constant & it is
1. 4/π²
2. 8/π²
3. 100
4. 2/π²
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Question 45 : Find the average value of output current for a 1-phase HW diode rectifier with R load, having RMS output current = 100A.
1. 200R A
2. 100/R√2 A
3. 200/R√2 A
4. 200/Rπ A
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