Which of the following dc motors has the least reduction in speed from no load to rated load?
Which of the following dc motors has the least reduction in speed from no load to rated load?
DC Motor MCQs
By putting a variable resistance (diverter) across the series field in a dc series motor, speed above normal can be obtained because
By putting a variable resistance (diverter) across the series field in a dc series motor, speed above normal can be obtained because
Two dc series motors connected in series are driving the same mechanical load. If now the motors are connected in parallel, the speed becomes
Two dc series motors connected in series are driving the same mechanical load. If now the motors are connected in parallel, the speed becomes
In a dc shunt motor, field excitation is kept at maximum value during starting to
In a dc shunt motor, field excitation is kept at maximum value during starting to
In a dc shunt motor, field excitation is kept at maximum value during starting to Read More »
A dc shunt motor is driving a mechanical load at rated voltage and rated excitation. If the load torque becomes double, then the speed of the motor
A dc shunt motor is driving a mechanical load at rated voltage and rated excitation. If the load torque becomes double, then the speed of the motor
What is the standard direction of a motor?
What is the standard direction of a motor?
What is the standard direction of a motor? Read More »
If back emf of d.c. motor is doubled while its speed is also doubled, then torque developed by the machine will
If back emf of d.c. motor is doubled while its speed is also doubled, then torque developed by the machine will
All electrical machines have poles with
All electrical machines have poles with
All electrical machines have poles with Read More »
Current normally used to excite synchronous and d.c. generators is
Current normally used to excite synchronous and d.c. generators is
Current normally used to excite synchronous and d.c. generators is Read More »