Question 31 : For a half wave bridge inverter, the output voltage
1. Vo = – Vs/2 for 0 < t < T/2
2. Vo = – Vs/2 for T/2< t<T
3. Vo = – Vs for 0 < t < T/2
4. Vo = Vs/2 for T/2< t < T
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Question 32 : External control of dc input voltage can be obtained by the use of a
1. transformer
2. chopper
3. inverter
4. converter
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Question 33 : The output current wave of a single-phase full bridge inverter on RL load is
1. a sine wave
2. a square wave
3. a triangular wave
4. constant dc
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Question 34 : In the single-pulse width modulation method, when the pulse width of 2d is equal to its maximum value of π radians, then the fundamental component of output voltage is given by
1. Vs
2. 4Vs/π
3. 0
4. 2Vs/π
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Question 35 : A single phase full bridge inverter has RLC load with R = 4 Ω, L = 35 mH and C = 155 μF. The dc input voltage is 230 V and the output frequency is 50 Hz. Find the angle by which the third harmonic current will lead/lag the third harmonic output voltage.
1. 67.25°
2. 96.4°
3. 49.87°
4. 81.3°
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Question 36 : In a single-phase half wave inverter ________ SCR(s) are/is gated at a time.
1. one
2. two
3. three
4. none of the mentioned
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Question 37 : In current source inverters
1. L filter is used after the CSI (load side)
2. L filter is used before the CSI (input side)
3. C filter is used after the CSI (load side)
4. C filter is used before the CSI (input side)
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Question 38 : In a single phase full wave bridge inverter, when the output is Vs or -Vs
1. one SCR and one diode are conducting
2. four SCRs are conducting
3. two SCRs are conducting
4. two diodes are conducting
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Question 39 : Line-commutated inverters have
1. AC on the supply side and DC on the load side
2. AC on both supply and load side
3. DC on both supply and load side
4. DC on the supply side and AC on the load side
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Question 40 : In stepped wave inverters, one of the inverters are gated such as to obtain
1. one level modulation
2. two level modulation
3. zero level modulation
4. none of the mentioned
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