Between the incoming and outgoing devices in voltage commutation
(A) Large overlapping takes place
(B) Small overlapping operation
(C) No overlapping operation
(D) None of these
The average value of the output voltage in a step – down dc chopper is given by__________?
(A) V 0 = V s
(B) V 0 = D V s
(C) V 0 = V s / D
(D) V 0 = V s / ( 1 – D )
In single phase VSI, the harmonic which is not present is____________?
(A) 2nd
(B) 3rd
(C) 5th
(D) 7th
In commutation PAC stands for_______?
(A) Permanent angle converter
(B) Phase angle converter
(C) Phase angle commutation
(D) Phase and commutation
Double fourier series analysis of PWM is_____________?
(A) Two dimensional functions
(B) Three dimensional functions
(C) One dimensional functions
(D) All of these
In the operation and control of both naturally commutated and forced commutated SCR base converter, commutation plays an important role. The converters is / are ___________?
(A) AC – DC
(B) DC – DC
(C) DC – AC
(D) All of these
In bipolar modulation, the carrier is symmetric about zero with amplitude equal to Cm, the PWM output
(A) Zero
(B) Switches between – 1 / 2 and + 1 / 2
(C) Switches between – 1 and + 1
(D) Switches between 0 and + 1
In a 3 phase VSI out of eight valid states, the number of valid states that produce zero ac line voltages is/are_________?
(A) One
(B) two
(C) Three
(D) Four
The square wave operation of 3 phase VSI lines contains the harmonics. The amplitudes are____________?
(A) Directly proportional to their harmonic order
(B) Inversely proportional to their harmonic order
(C) Not related to their harmonic order
(D) None of these
In a three phase voltage source inverters____________?
(A) Only amplitude of voltage is controllable
(B) Only phase is controllable
(C) Both amplitude and phase is controllable
(D) Amplitude, phase and frequency of voltages should always be controllable