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WorksheetsDC Motor Speed Control - From Basic to Breakthroughs
Total questions: 10
Worksheet time: 5mins
Which of the following is a traditional method for controlling the speed of a DC motor?
Using an inverter
Adding resistance in the armature circuit
Using a thyristor-based chopper
Changing the polarity of the motor
What effect does increasing the armature voltage have on the speed of a DC motor?
It decreases the motor speed
It increases the motor speed
It has no effect on the motor speed
It reverses the motor direction
In a DC shunt motor, speed is primarily controlled by adjusting which of the following?
The magnetic field strength
The rotor resistance
The load torque
The supply voltage to the field windings
What is the primary advantage of using chopper control in DC motor speed regulation?
Lower cost
Increased mechanical reliability
High efficiency and precise control
Simpler design compared to traditional methods
In separately excited DC motors, how is the field flux controlled?
By varying the load resistance
By changing the field current
By altering the armature voltage
By adjusting the motor’s mechanical load
Which control method is best suited for large variations in DC motor speed while maintaining high efficiency?
Field flux control
Armature resistance control
Chopper control
Mechanical load adjustment
When controlling the speed of a DC motor by adding resistance to the armature circuit, what happens to the motor’s torque?
Torque increases
Torque remains constant
Torque decreases
Torque becomes unstable
Thyristor-based speed control for DC motors is commonly used because it provides:
High starting torque
Smooth, stepless speed control
Low efficiency in high-torque applications
Constant speed control only
Which of the following is a disadvantage of armature resistance control for DC motors?
It leads to a decrease in efficiency
It offers high torque at low speeds
It provides smooth and continuous speed control
It reduces motor size and cost
What happens when you reduce the field current in a separately excited DC motor?
Motor speed decreases
Motor speed increases
Motor torque increases
Motor efficiency drops significantly
