Question 41 : In case of class B commutation or resonant-pulse commutation with L = 5 μH and C = 20 μC with initial voltage across the capacitor (Vs) = 230 V. Find the peak value of resonant current.
1. 560 A
2. 460 A
3. 360 A
4. 260 A
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Question 42 : In the complete firing circuit, the driver circuit consists of
1. pulse generator & power supply
2. gate leads & power supply
3. pulse amplifier & pulse transformer
4. pulse detector & pulse amplifier
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Question 43 : The diode in the R firing circuit
1. ensures that the gate voltage is a half wave DC pulse
2. ensures that the gate voltage is a full wave DC pulse
3. ensures that the gate voltage is a half wave AC pulse
4. ensures that the gate voltage is a full wave AC pulse
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Question 44 : In case of a R firing circuit with V_gp > V_gt
1. α = 90°
2. α > 90°
3. α < 90°
4. α = 0°
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Question 45 : The major function of the pulse transformer is to
1. increase the voltage amplitude
2. reduce harmonics
3. isolate low & high power circuit
4. create periodic pulses
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Question 46 : In case of class B commutation or resonant-pulse commutation with L = 5 μH and C = 20 μC with the initial voltage across the capacitor (Vs) = 230 V. Find the conduction time for auxiliary thyristor.
1. 0.23 μs
2. 6.57 μ
3. 31.41 μs
4. 56 μs
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Question 47 : Solid State Relays (SSRs) have
1. moving parts
2. no moving parts
3. a coil
4. a contactor
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Question 48 : Applications of cycloconverters include
1. speed control of ac drives
2. induction heating
3. static VAr compensation
4. all of the mentioned
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Question 49 : A cycloconverter is a _________
1. one stage power converter
2. one stage voltage converter
3. one stage frequency converter
4. none of the mentioned
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Question 50 : The principle of three phase cycloconverter is to
1. add and remove number of SCRs
2. vary progressively the firing angle of the devices
3. keep the firing angle as 0° for all the devices
4. none of the mentioned
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