1000+ GATE ECE Question Paper with Solutions Pdf - 1

Question: 1

The feedback diodes in a d.c. thyristor inverter

(A) improve the harmonic distortion of the inverter output current

(B) improve the switching properties of the inverter

(C) provide reverse bias effectively to the thyristors for turn off

(D) freewheel the load current

Question: 2

The advantage of using a freewheeling diode with bridge type ac to dc converter is

(A) improved input power factor

(B) regenerative braking

(C) reduced cost of system

(D) reliable speed control

Question: 3

Reverse recovery current in a diode depends upon

(A) temperature

(B) storage charge

(C) forward field current

(D) peak inverse voltage

Question: 4

Thyristors are classified as inverter grade or converter grade based on

(A) turn-off time

(B) holding current

(C) forward breakdown voltage

(D) turn on time

Question: 5

The peak inverse voltage in ac to dc converter system is highest in

(A) single phase full converter

(B) single phase full wave midpoint converter

(C) 3 phase half wave converter

(D) 3 phase bridge converter