DC Motors MCQs

List I represent the different types of electric motors, whilst list II gives some of their characteristics : Match the two lists by choosing the correct answer from the following :

Match list I with the appropriate answer in the list II and select the correct answer from the codes riven below the lists :Motor Typical Application (A) Permanent magnet dc motor (B) Stepper motor (C) Single-phase induction motor (D) Universal motorCodes :

A4 pole d.c. generator is running at 1500 r.p.m. The frequency of current in the armature winding is

Speed control by the variation of field flux result in

Speed control by varying the armature_ circuit resistance offers

The volt-ampere equation for a long shunt compound motor is given by

A differential compounded d.c. motor drives a constant torque load. If series field winding gets short circuited, then

A cumulatively compounded d.c. motor drives a constant power load. If series Em f expression field winding gets short circuited, then

For a p-pole machine, the relation between electrical (0e) and mechanical (0m) degrees is given by