Speed Control of D.C Motor - MCQs with Answers

Speed Control of D.C Motor - MCQs with Answers

Q1. Speed of d.c. shunt motors are controlled by

a. Flux control method
b. Rheostatic control method
c. Voltage control method
d. All of these

View Answer / Hide Answer

Q2. With the increase in temperature, the speed of series and shunt motor will

a. Increase, decrease
b. Decrease, increase
c. Increase, increase
d. Decrease, decrease

View Answer / Hide Answer

Q3. If a portion of armature current is diverted through the diverter resistance, then the speed of d.c. series motor

a. Remains same
b. Increases
c. Decreases
d. None of these

View Answer / Hide Answer

Q4. A series wound motor is also called as universal motor because

a. It will run equally well using either an ac or a dc voltage source
b. It will run well below and above rated speed
c. It can be used in all kinds of applications
d. None of these

View Answer / Hide Answer

Q5. In the flux control method for controlling the speed of d.c. shunt motor, the speed control is not possible

a. Below normal rated speed
b. Above normal rated speed
c. Both (a) and (b)
d. None of these

View Answer / Hide Answer

Q6. In armature voltage control method or rheostatic control method for speed control in d.c. shunt motor, a variable resistance is

a. Added in series with the armature
b. Added in series with the field
c. Connected across armature
d. Both in series with armature and field

View Answer / Hide Answer

Q7. Which method is suitable for the speed control, below and above the normal rated speed of d.c. shunt motor?

a. Flux control method
b. Rheostatic control method
c. Voltage control method
d. All of these

View Answer / Hide Answer

Q8. If a resistance is added in series with the field winding of d.c. shunt motor, then its

a. Both speed and torque decreases
b. Both speed and torque increases
c. Speed decreases, torque increases
d. Speed increases, torque decreases

View Answer / Hide Answer

Q9. Ward-Leonard system is used for

a. Wide range of speed control
b. Very sensitive speed control
c. Both (a) & (b)
d. None of these

View Answer / Hide Answer

Q10. For frequent starting, stopping and reversals, which motor is commonly used?

a. Permanent d.c. motor
b. Ward-Leonard system
c. Brushless d.c. motor
d. All of these

View Answer / Hide Answer