Form factor of a rectifier is the ratio of ______________?
(A) Root mean square value of voltage and current to its peak value
(B) Root mean square value of voltage and current to its average value
(C) Average value of current and voltage to its root mean square value
(D) Peak value of current and voltage to its root mean square value
Silicon controlled rectifier can be turned on____________?
(A) By applying a gate pulse and turned off only when current becomes zero
(B) And turned off by applying gate pulse
(C) By applying a gate pulse and turned off by removing the gate pulse
(D) By making current non zero and turned off by making current zero
A step – down choppers can be used in___________?
(A) Electric traction
(B) Electric vehicles
(C) Machine tools
(D) All of these
In a lossless inverter, the average power absorbed in one period by the load must be__________?
(A) Equal to the average power supplied by the dc source
(B) Greater than the average power supplied by the dc source
(C) Lesser than the average power supplied by the dc source
(D) Equal to the average power supplied by the ac source
The ac voltage controller can be used for ___________?
(A) Lighting and heating control
(B) On – line transformer tap changing
(C) Soft starting
(D) All of these
The phase angle of gate signal in TRIAC can be shifted by using_____________?
(A) A capacitor
(B) A variable resistor
(C) An inductor
(D) Only (a) and (b)
In the SPWM, the modulating signal is___________?
(A) Square
(B) Sinusoidal
(C) Triangular
(D) Saw – tooth
A TRIAC can be turned on with______________?
(A) Positive voltage at the gate terminal
(B) Negative voltage at the gate terminal
(C) Either (a) or (b)
(D) None of these
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 direction
The Graetz bridge makes excellent use of ______________?
(A) Current transformer
(B) Potential transformer
(C) Power transformer
(D) SCR