IGBT stands for___________?
(A) Insulated gate bipolar transistor
(B) Insulated gate bidirectional transistor
(C) Inductive gate bipolar transistor
(D) Inductive gate bidirectional transistor
Electrical power output in a d.c. generator is equal to____________?
(A) Electrical power developed in armature – copper losses
(B) Mechanical power input – iron and friction losses
(C) Electrical power developed in armature – iron and copper losses
(D) Mechanical power input – iron and friction losses – copper losses
An ideal switch is___________?
(A) Lossless
(B) Carry current in any direction when it is on
(C) Does not carry any current in any direction when it is off
(D) All of these
In a 3 phase bridge rectifier the ripple frequency is _____________?
(A) Equal to the input frequency
(B) Twice the input frequency
(C) Three times the input frequency
(D) Six times the input frequency
In a load commutated DC – DC chopper, the capacitor has a_____________?
(A) Symmetric triangular voltage across itself
(B) Symmetric rectangular voltage across itself
(C) Symmetric trapezoidal voltage across itself
(D) Symmetric sinusoidal voltage across itself
The sum of all phase current in a star connected primary winding with no neutral connection is equal to___________?
(A) Phase current
(B) Three times the phase current
(C) Three times the line current
(D) Zero at all times
For power output higher than 15 kW, the suitable rectifier is________________?
(A) Single phase
(B) 3 phase
(C) Poly phase
(D) Only (b) and (c)
In a full wave rectifier, the rectification ratio is approximately equal to____________?
(A) 61%
(B) 71%
(C) 81%
(D) 91%
LISN is a device used to measure conducted emissions. LISN stands for_____________?
(A) Line integrated stabilization network
(B) Line impedance stabilization network
(C) Line integrated stored network
(D) Laser integrated stabilization networking
In a single phase full wave rectifier, during blocking state the pea inverse voltage of diode is______________?
(A) V m
(B) 2 V m
(C) V m / 2
(D) 4 V m