Computer Programming MCQs

5739 MCQs  (Page 97 of 574)

TRIAC is a semiconductor power electronic device which contains____________?
A. Two scr’s connected in reverse parallel
B. Two scr’s connected in parallel
C. Two scr’s connected in series
D. Two bjt’s connected in series
The curve between V and I of SCR when anode is positive w.r.t cathode and when anode is negative w.r.t cathode are known as_____________________?
A. Both as forward characteristics
B. Both as reverse characteristics
C. Former as forward characteristics and later as reverse characteristics
D. Former as reverse characteristics and later as forward characteristics
An SCR can be used___________?
A. As static conductor
B. For power control
C. For speed control of dc shunt motor
D. All of these
A crowbar is a circuit which is used to protect a_____________?
A. Voltage sensitive load from excessive dc power supply output voltages
B. Current sensitive load from excessive dc power supply output voltages
C. Voltage sensitive load from excessive ac power supply output voltages
D. Current sensitive load from excessive ac power supply output voltages
A full wave rectifier with resistive load produces___________?
A. Second harmonic
B. Third harmonic
C. Fifth harmonic
D. Do not produce harmonics
An ideal diode is___________?
A. Unidirectional
B. Bidirectional
C. Fixed voltage polarity
D. Only (a) and (c)
The IGBT resulted in higher switching speed and lower energy losses. It can be used for___________?
A. Uninterruptible power supplies
B. Induction heating system
C. Constant voltage and frequency power supplies
D. All of these