PMBLDC MOTOR

In BLDC motor field winding is kept on _______________

• a) Stator

• b) Rotor

• c) Can be placed anywhere

• d) Absent

Which of the following is not an advantage of BLDC motor over conventional DC motor.

• a) Less maintenance

• b) Long life

• c) No risk of explosion or possibility of RF radiation

• d) Low cost

In BLDC motor driver module, we do not require ______________

• a) SCRs

• b) Power transistors

• c) FETs

• d) Transistors

In medical fields which DC motor is widely used?

• a) PMDC

• b) BLDC

• c) Brushed DC motor

• d) Cannot be determined

Construction of BLDC is exactly similar to the ______________

• a) Conventional DC motor

• b) Induction motor

• c) Permanent magnet synchronous motor

• d) Totally different construction

Typical brushless motor doesn’t have ______________

• a) Commutator

• b) Permanent magnet

• c) Electronic controller

• d) Fixed armature

BLDC can be used instead ____________

• a) Synchronous motor

• b) Normal brushed DC motor

• c) Induction motor

• d) Air motor

The speed of permanent magnet d.c. motor cannot be controlled by

• a. Flux control method

• b. Rheostatic control method

• c. Electronic circuits

• d. None of these

Permanent magnet d.c. motors are extensively used in

• a. Automobiles

• b. Heaters

• c. Air conditioners

• d. All of these

The Hall effect sensor is used as the rotor position sensor for the BLDC motor.

• a) True

• b) False