Question 71 : Control of frequency and control of voltage in 3-phase inverters is
1. possible only through inverter control circuit
2. possible through the control circuit of inverter and converter
3. possible through inverter control of frequency and through converter control for voltage
4. none of the mentioned
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Question 72 : In the sinusoidal pulse width modulation, ____________ is the reference wave signal.
1. square wave
2. triangular wave
3. sinusoidal wave
4. quasi-square wave
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Question 73 : In the single-pulse width modulation method, the Fourier coefficient a_n is given by
1. (Vs/π) [ cos(nπ/2) cos(nd) ].
2. 0
3. (4Vs/nπ) [sin(nπ/2) sin(n
4. ].d) (2Vs/nπ) [sin(nπ/2) sin(nd)].
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Question 74 : The number of diodes, SCRs and other components in full-bridge inverter McMurray inverter is ____________ of those in half-bridge McMurray inverter.
1. same
2. double
3. three times
4. none of the mentioned
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Question 75 : A single phase full bridge inverter using transistors and diodes is feeding a R load of 3 Ω with the dc input voltage of 60 V. Find the fundamental frequency output power.
1. 1200 W
2. 856 W
3. 972 W
4. 760 W
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Question 76 : In sinusoidal pulse width modulation, __________ wave is compared with a ___________ type of wave.
1. square, sinusoidal
2. sinusoidal, triangular
3. sinusoidal, quasi-square
4. none of the mentioned
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Question 77 : Force-commutated CSIs need
1. capacitors for their commutation
2. inductors for their commutation
3. diodes for their commutation
4. none of the mentioned
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Question 78 : In case of a single-pulse width modulation with the pulse width = 2d, the peak value of the fundamental component of voltage is given by the expression
1. 4Vs/π
2. Vs
3. (4Vs/π) sin 2d
4. (4Vs/π) sin d
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Question 79 : Single phase half bridge inverters requires
1. two wire ac supply
2. two wire dc supply
3. three wire ac supply
4. three wire dc supply
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Question 80 : The fundamental component of output voltage for a half wave bridge inverter is given by
1. (4Vs/π) sinωt
2. (2Vs/π) sinωt
3. (Vs/2π) sinωt
4. (Vs)
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