DC MOTOR 2
DC Motor Knowledge Quiz
Test your knowledge on D.C. motors with this engaging quiz! Challenge yourself with a variety of questions covering essential concepts, applications, and technical details about D.C. motors.
Whether you are a student, a teacher, or just a motor enthusiast, this quiz is designed to enhance your understanding of:
- Types of D.C. motors
- Motor applications
- Starting mechanisms
- Torque and speed characteristics
11. In which of the following applications, D.C.series motor is invariably used?
Starter for a car
Drive for a water pump
Fan motor
Motor operation in A.C. or D.C.
12. A three point starter is considered suitable for ____________.
Shunt motor
Shunt as well as compound motor
Shunt, compound and series motor
All D.C motors
13. Which of the following rule can be used to determine the direction of rotation of D.C.motor?
Lenz's law
Faraday's law
Coloumb's law
Fleming's left hand rule
14. Which of the following load normally needs starting torque more than the rated torque?
Blower
Conveyers
Air coompressor
Centrifugal pumps
15. The speed of the D.C.series motor is _____________
Propotional to the armature current
Propotional to the square of the armature current
Proportional to field current
Inversely proportional to the armature current
16. In a D.C.series motor, if the armature current is reduced by 50%, the torque of the motor will be equal to _______________
100% of the previous value
50% of the previous value
25% of the previous value
10% of the previous value
17. The current drawn by the armature of the D.C.motor is directly proportional to ______
The resistance of the armature
The speed of the motor
The voltage across the terminals
None of the above
18. The power mentioned on the name plate of an electric motor indicates __________
The power drawn in kW
The power drawn in kVA
The gross power
The output power available at the shaft
19. For the same H.P.rating and full load speed, the following motor has poor starting torque ____________
Shunt
Series
Differentially compound
Cumulatively compound
20. If the supply voltage for a D.C.motor is increased, which of the following will decrease?
Starting torque
Operating speed
Full load current
All of the above
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