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1.
The field current control of d.c. shunt motor will provide
2.
Which of the following method of speed control of d.c. machine will offer minimum efficiency?
3.
In which of the following methods of speed control computation is unsatisfactory?
4.
The dynamic braking can be used for
5.
The plugging gives the
6.
Which of the method of breaking will be selected if the highest braking torque is required?
7.
If the terminals of armature of d.c. machine are interchanged, this action will offer following kind of braking.
8.
If a d.c. motor for 45°C ambient temperature is to be used for 55°C ambient temperature, then the motor
9.
If we have to control the speed of 150 HP d.c. motor from zero to 1000 rpm having rated speed of 1500 rpm. Then it will be preferred to
10.
For which of the following alternators, the distribution factor will be 0.96?