Q. A 220 V, 15 kW, 1000 RPM shunt Motor with an armature resistance of 0.25Ω, has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 RPM while drawing a line current of 52.8 A and a […]
The demand for a large increase in torque of a d.c. shunt motor is met by
The demand for a large increase in torque of a d.c. shunt motor is met by Read More »
If a DC series motor is made to run on AC supply. It will
If a DC series motor is made to run on AC supply. It will Read More »
The direction of rotation of a DC shunt motor can be reversed by interchanging
The direction of rotation of a DC shunt motor can be reversed by interchanging Read More »
The deciding factor in the selection of a d.c. motor for a particular application is its ……………..characteristic
The Brushes on DC machine are always placed on—————, in order to achieve sparkles commutation?
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
For an application that requires smooth and precise speed control over the wide range, the motor is preferred is
The most commonly used method of speed control of a D.C motor is by varying the
The most commonly used method of speed control of a D.C motor is by varying the Read More »
A separately excited 300 V DC shunt motor under no-load runs at 900 rpm drawing an armature current of 2 A
