The condition for maximum efficiency for a D.C. generator is
Select an option to see the answer and solution.
Electrical Engineering · all questionsD.C. Motors
D.C. Motors
practice.
Practice every MCQ with options. Use Show answers when you want the correct option and solution.
122
Questions
1/7
Page
Pick an option on a question to see the right answer and solution.
If a D.C. motor is connected across the A.C. supply it will
Select an option to see the answer and solution.
The speed of a D.C. shunt motor can be increased by
Select an option to see the answer and solution.
The armature voltage control of D.C. motor provides
Select an option to see the answer and solution.
Starters are used with D.C. motors because
Select an option to see the answer and solution.
If Ia be the armature current, then speed of a D.C. shunt motor is
Select an option to see the answer and solution.
In case of D.C. shunt motors the speed is dependent on back e.m.f. only because
Select an option to see the answer and solution.
A direct on line starter is used: for starting motors
Select an option to see the answer and solution.
The ratio of starting torque to full-load torque is least in case of
Select an option to see the answer and solution.
For starting a D.C. motor a starter is required because
Select an option to see the answer and solution.
Which of the following method of speed control of D.C. machine will offer minimum efficiency?
Select an option to see the answer and solution.
A D.C. series motor is that which
Select an option to see the answer and solution.
Sparking at the commutator of a D.C. motor may result in
Select an option to see the answer and solution.
For which of the following applications a D.C. motor is preferred over an A.C. motor?
Select an option to see the answer and solution.
Which D.C. motor has got maximum self relieving property?
Select an option to see the answer and solution.
In a manual shunt motor starter
Select an option to see the answer and solution.
In Ward-Leonard control the lower limit of speed is imposed by
Select an option to see the answer and solution.
Which motor should not be started on no-load?
Select an option to see the answer and solution.
The speed of a D.C. shunt motor is required to be more than full load speed. This is possible by
Select an option to see the answer and solution.
D.C. motor is to a drive a load which is almost nil for certain part of the load cycle and peak value for short duration. We will select this
Select an option to see the answer and solution.