The method of speed control of DC Shunt motor is used for applications where a very wide range sensitive speed control is required is

A dc series motor has an armature resistance of 0.06 Ω and series field resistance of 0.08 Ω. The motor is connected to a 400 V supply. The line current is 20 A when the speed of the machine is 1100 rpm. When the line current is 50 A and the excitation is increased to 30%, the speed of the machine in rpm is

Neglecting all losses, the developed torque (T) of a DC separately excited motor, operating under constant terminal voltage, is related to its output power (P) as under:

A separately excited DC motor has an armature resistance of 0.5ohm. It runs from a 200 V DC supply drawing an armature current of 20 A at 1500 rpm. For the same field current, the torque developed for an armature current of 10 A will be

A 240 V DC series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 Ω. The value of resistance which must be added to obtain rated torque at 1000 rpm is

The deciding factor in the selection of a d.c. motor for a particular application is its ___________ characteristic.

The direction of rotation of a DC shunt motor can be reversed by interchanging

The demand for a large increase in torque of a d.c. shunt motor is met by

The friction and windage losses in a d.c. motor depends upon ____________

The iron losses in a d.c. motor depends upon _____________