#1
What is the purpose of a contactor in motor control?
To provide overload protection
To interrupt the circuit during fault conditions
To control the starting and stopping of the motor
To convert AC to DC
#2
What is the function of a motor starter?
To protect the motor from overcurrent
To provide power to the motor
To control the speed of the motor
To generate torque
#3
What is the primary purpose of a motor overload relay?
To disconnect the motor from the power supply during overload conditions
To regulate the voltage supplied to the motor
To protect the motor against overheating
To control the direction of rotation
#4
In a three-phase induction motor, which component is responsible for generating the rotating magnetic field?
Rotor
Stator
Commutator
Brushes
#5
What is the function of a motor capacitor?
To provide starting torque in single-phase induction motors
To regulate motor speed
To protect against overcurrent
To provide emergency shutdown
#6
Which of the following devices is used to control the speed of an induction motor?
Thyristor
Variable resistor
Inverter
Fuse
#7
What component is used to start a single-phase induction motor?
Thermal overload relay
Start capacitor
Solenoid valve
Transformer
#8
Which of the following is NOT a type of DC motor?
Series-wound motor
Shunt-wound motor
Synchronous motor
Compound-wound motor
#9
What is the primary function of a soft starter in motor control?
To reduce mechanical stress during motor starting
To increase motor speed gradually
To provide emergency shutdown
To protect against overvoltage
#10
What is the role of a centrifugal switch in a single-phase induction motor?
To control the speed of the motor
To reverse the direction of rotation
To switch the starting winding out of the circuit
To protect against overcurrent
#11
Which of the following statements is true about a servo motor?
It operates only in continuous rotation mode
It requires an external power supply
It is a closed-loop system
It has low torque
#12
Which of the following motor starting methods provides the highest starting torque?
Direct-on-line (DOL) starting
Star-delta starting
Auto transformer starting
Soft starter
#13
Which motor starting method is preferred for large induction motors to reduce starting current?
Direct-on-line (DOL) starting
Star-delta starting
Soft starter
Variable frequency drive (VFD) starting
#14
Which of the following statements is true about a brushless DC motor (BLDC)?
It requires brushes for commutation
It has higher maintenance compared to brushed DC motors
It operates on alternating current
It is more efficient and has a longer lifespan compared to brushed DC motors
#15
What is the purpose of a variable frequency drive (VFD) in motor control?
To provide emergency shutdown
To regulate motor speed by varying the frequency of the supplied voltage
To convert AC to DC power
To generate torque