271. In dual converters________________?
A. Both rectifiers provides positive current to the load
B. Both rectifiers provide negative current to the load
C. One rectifiers provide positive current to the load and the other negative current
D. One rectifier provide positive current to the source and the other negative current to the load
272. The power MOSFET device is a___________?
A. Current controlled unipolar device
B. Voltage controlled unipolar device
C. Current controlled bipolar device
D. Voltage controlled bipolar device
273. In a phase controlled 3 phase ac voltage controller, the harmonic present is__________?
A. 2nd
B. 3rd
C. 5th
D. 7th
274. With increase in firing angle,
A. Both harmonic distortion and quality of input current increases
B. Harmonic distortion increases and quality of input current decreases
C. Harmonic distortion decreases and quality of input current increases
D. Both harmonic distortion and quality of input current decreases
275. The maximum firing angle in the half wave controlled regulator is_____________?
A. 180 degree
B. 190 degree
C. 200 degree
D. 210 degree
276. The most suited gate pulses given to the AC regulator with R – L load can be in the form of____________?
A. Continuous signal
B. Large isolating pulse transformer
C. A train of pulses
D. None of these
277. The on – state voltage drop of IGBT consists of__________?
A. Drop across the collector junction
B. Drop across the drift region
C. Drop across MOSFET portion
D. All of these
278. Harmonics in 3 phase inverters can be reduced by using___________?
A. Passive filter
B. Active filter
C. Both passive and active filters
D. None of these
279. To detect an over – current fault condition, the most reliable method is to connect a_____________?
A. Current sensor across IGBT
B. Voltage sensor across IGBT
C. Current sensor in series with IGBT
D. Voltage sensor in series with IGBT
280. The advantage of using free – wheeling diode in half controlled bridge converter is that
A. There is always a path for the dc current independent of the ac line
B. There is always a path for the ac current independent of the ac line
C. There is always a path for the dc current dependent of the ac line
D. There is always a path for the ac current independent of the ac line
NOTE
IF YOU THINK ANY OF THE MCQ ABOVE IS WRONG.
PLEASE COMMENT WITH CORRECT ANSWER AND ITS DETAIL EXPLANATION IN COMMENT BOX.
THANK YOU