SCRs are used in series to meet_______________?
(A) high current demand
(B) low voltage demand
(C) low current demand
(D) high voltage demand
Which following is a two terminal three layer device?
(A) BJT
(B) Power dioed
(C) MOSFET
(D) None of above
ON state voltage drop across SCR lie between the range_____________?
(A) 0 – 0.5 V.
(B) 0.5 – 1 V.
(C) 1 – 1.5 V.
(D) 1.5 – 2 V.
In ac – dc conversion, when the switch is closed then the sum of voltages around the loop is____________?
(A) Zero
(B) Non zero
(C) Equal to the sum of voltage when switch is open
(D) Twice of the voltage when switch is open
If a shunt motor is started with its field winding open then?
(A) It will rotate at the same speed as that with its field winding closed
(B) It will rotate at less speed as that with its field winding closed
(C) It will rotate at dangerously high speed
(D) None of these
A rectifier with an external low pass filter is an example of______________?
(A) Indirect switch matrix circuits
(B) Direct switch matrix circuits
(C) Embedded converters
(D) All of these
What is the advantage of HRC fuses over Rewirable fuses?
(A) High speed operation
(B) High rupturing capacity
(C) No ageing effect
(D) All of the above
The power demand can be estimated approximately by___________?
(A) Load survey method
(B) Mathematical method
(C) Statistical method
(D) Economic parameters
4 thyristors rated 200 V in series. The operating voltage of the string is 600 V. Derating factor of the string is_____________________?
(A) 0.75
(B) 0.7
(C) 0.2
(D) 0.25
Unipolar modulation is generally used in____________?
(A) AC – AC converters
(B) AC – DC converters
(C) DC – AC converters
(D) DC – DC converters