n a phase controlled 3 phase ac voltage controller, the harmonic present is__________?
n a phase controlled 3 phase ac voltage controller, the harmonic present is__________?
A. 2nd
B. 3rd
C. 5th
D. 7th
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DIAC and TRIAC both are semiconductors devices and conduct in____________________?
DIAC and TRIAC both are semiconductors devices and conduct in____________________?A. DIAC conducts in forward direction and TRIAC conducts in reverse direction
B. Both conducts in forward direction
C. Both conducts in reverse direction
D. Both conducts in either directionLet of a thyristor Vc1, Vc2, Vc3 are forward break over voltage for gate current Ig1, Ig2, Ig3 respectively. Then________________?
Let of a thyristor Vc1, Vc2, Vc3 are forward break over voltage for gate current Ig1, Ig2, Ig3 respectively. Then________________?A. Vc1 > Vc2 > Vc3 when Ig1 > Ig2 > Ig3.
B. Vc1 > Vc2 > Vc3 when Ig1 < Ig2 < Ig3.
C. Vc1 = Vc2 = Vc3 any value of Ig.
D. Vc1 > Vc2 > Vc3 when Ig1 ≥ Ig2 &AtilCB used for over current protection of thyristor operates when the fault current is__________?
CB used for over current protection of thyristor operates when the fault current is__________?A. of long period
B. of short duration
C. both (A) and (B)
D. neither (A) nor (B)In BJT, the forward biased base emitter junction inject holes from base to emitter, the holes_______?
In BJT, the forward biased base emitter junction inject holes from base to emitter, the holes_______?A. Do not contribute to the collector current
B. Result in net current flow component into the base
C. Contribute to the collector current
D. Only (a) and (b)
E. Only (b) and (c)An SCR is considered to be a semi controlled device because_______?
An SCR is considered to be a semi controlled device because_______?A. it can be turned OFF but not ON with a gate pulse.
B. it conducts only during one half cycle of an alternating current wave.
C. it can be turned ON but not OFF with a gate pulse.
D. it can be turned ON only during one half cycle of an AC.Double fourier series analysis of PWM is_____________?
Double fourier series analysis of PWM is_____________?A. Two dimensional functions
B. Three dimensional functions
C. One dimensional functions
D. All of these