AC DC MOTOR DRIVES - Quiz

1) Which is proportional to the torque in D.C motor?

Back e.m.f Field current Terminal voltage Armature current

2) What is IGBT in VF drive?

Inverter switching device D.C bus switching device Rectifier switching device Field supply switching device

3) What is the function of VSI drives?

Converts A.C to D.C Converts A.C to A.C Converts D.C to A.C Converts D.C to D.C

4) Why the A.C drives are mostly used in process plant?

Easy to operate Robust in construction Very high starting torque Maintenance free long life

5) How the base speed of D.C shunt motor can be increased by using D.C drive?

By reducing the field current By increasing the field current By increasing the supply voltage By reducing the armature voltage