Electrical Machines Questions and Answers – DC Motors
Speed Control of DC Motors
0%
The armature resistance speed control is best illustrated by which of the following
Correct!
Wrong!
-
At a very low speed, increase in field resistance will
Correct!
Wrong!
-
A laboratory group was working with a set of 3-hp shunt DC motor. But there was a mistake that it was fused with a 0.3A fuse instead 3A fuse. Then it was started
Correct!
Wrong!
-
How does the power varies with the variations in the speed, for a dc shunt motor?
Correct!
Wrong!
-
The effect of field resistance speed control on a shunt motor speed torque characteristic is
Correct!
Wrong!
-
Small DC motors have best speed control by
Correct!
Wrong!
-
The PWM control of DC motor varies
Correct!
Wrong!
-
Mark the wrong option. Which of the following cause and effect behaviour in speed control is correct when field resistance is increased.
Correct!
Wrong!
-
To implement armature voltage control, it must be ensured that
Correct!
Wrong!
-
The torque limit of speed for a shunt motor
Correct!
Wrong!
-
Armature voltage control works for speeds _____ base speed and field resistance control works well for speed _____ base speed.
Correct!
Wrong!
-
Ward-Leonard system of system of speed control is not recommended for
Correct!
Wrong!
-
Why does DC motor sometimes run too fast when under-loaded?
Correct!
Wrong!
-
Run-away for large DC machine is avoided by using
Correct!
Wrong!
-
Speed Control of DC Motors
I got %%score%% of %%total%% right
