DC Motor Interview Questions - Electronic Engineering
Advertisements
Electrical Motors Interview Question And Answers · What are the causes of hot bearings? · What causes the heating of the armature? · What is the commutator pitch of a 4-pole DC Motor?
- does not run as a generator
- comes to stop after sometime
- runs as a generator
- also runs as a motor
Question 1: One DC motor drives another DC motor. The second DC motor when excited and driven?
Answers: runs as a generator
- the speed increases rapidly
- the back EMF decreases
- the torque increases rapidly
- the current drawn increases rapidly
Question 2: A series motor is started without load. The effect is that?
Answers: the speed increases rapidly
- armature divider
- potential divider
- voltage regulator
- field divertor
Question 3: The variable resistor shunting the field of a DC series motor is called a?
Answers: field divertor
- winding
- commutator
- size of conductor
- yoke
Question 4: A DC motor can be easily identified by?
Answers: commutator
- these motors have high starting torque
- these motors axe not self starting
- to restrict armature current as there is no back e.m.f. while starting
- back e.m.f. of these motors is zero initially
Question 5: Starters are used with D.C. motors because ?
Answers: to restrict armature current as there is no back e.m.f. while starting
- motor energy is dissipated as heat
- motor energy is dissipated in windage losses
- motor energy is dissipated in armature heating
- motor is made to run as a generator
Question 6: In regenerative braking?
Answers: motor is made to run as a generator
- level compounded
- cumulatively compounded
- under compounded
- differentially compounded
Question 7: Flywheel is used with DC compound motor to reduce the peak demand by the motor, compound motor will have to be?
Answers: cumulatively compounded
- 8 poles
- 6 poles
- 2 poles
- 4 poles
Question 8: Small DC motors up to 5 HP usually have?
Answers: 2 poles
- To reduce eddy current loss
- To spread out flux for better uniformity
- To reduce the reluctance of the magnetic path
- To support the field coils
Question 9: Which one of the following is not the function of pole shoes in a DC machine ?
Answers: To reduce eddy current loss
- Series motor
- Differentially compounded motor
- Shunt motor
- Cumulatively compounded motor
Question 10: Which DC motor will be suitable along with flywheel for intermittent light and heavy loads ?
Answers: Cumulatively compounded motor
Report Card
Total Questions Attempted: 0
Correct: 0 Wrong: 0
--
Advertisements
Related Articles
DC Motor MCQ
DC Motors Most Important Interview Questions and Answers. Viva Questions DC motors important question and...
DC Motor MCQ
DC Motor Questions · 1. What will happen if the DC shunt motor is linked across the AC supply? What is the...
DC Motor MCQ
DC Motor Questions · 1. What will happen if the DC shunt motor is linked across the AC supply? 2. If the...