Question 141 : The single-phase McMurray-Bedford type bridge inverter is a/an
1. auxiliary-commutated inverter
2. complementary-commutated inverter
3. supplementary-commutated inverter
4. none of the mentioned
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Question 142 : The total harmonic distortion (THD) is the measure of
1. input vs output power factor
2. temperature sensitivity
3. waveform distortion
4. contribution of each harmonic to the total output
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Question 143 : In the single-pulse width modulation method, the output voltage waveform is symmetrical about __________
1. π
2. 2π
3. π/2
4. π/4
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Question 144 : In case of a single-pulse width modulation with the pulse width = 2d, to eliminate the nth harmonic from the output voltage
1. d = π
2. 2d = π
3. nd = π
4. nd = 2π
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Question 145 : A single phase half bridge inverter has RLC load. The dc input voltage (Vs/2) = 115 V and the output frequency is 50 Hz. The expression for the load voltage up to the fifth harmonic will be given by
1. 146 sin 314t + 48.81 sin 314t + 58.57 sin 318t + 28.31 sin 318t + 3.686 sin 318t
2. 146 sin 314t + 48.81 sin (3 x 314t) + 29.28 sin (5 x 318t)
3. 146 sin 314t + 48.81 sin (2 x 314t) + 58.57 sin (3 x 318t)
4. none of the mentioned
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Question 146 : In the 180° mode VSI, ___________ devices conduct at a time.
1. 5
2. 2
3. 3
4. 4
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Question 147 : A certain full bridge type inverter circuit has its rms value of fundamental load current component given by W. The fundamental frequency component of the load current would be given by
1. W sin ωt
2. (W/√2) sin ωt
3. √2 W sin ωt
4. sin ωt
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Question 148 : The output voltage obtained by connecting two inverters through a transformer is a
1. square wave
2. sine wave
3. quasi-square wave
4. none of the mentioned
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