1. What type of motor is an asynchronous motor?
a) AC motor
b) DC motor
c) Synchronous motor
d) Asynchronous motor
Answer: d) Asynchronous motor
2. The asynchronous motor operates on ___________ power.
a) Single-phase
b) Two-phase
c) Three-phase
d) Four-phase
Answer: c) Three-phase
3. Which of the following statements is true for the asynchronous motor’s speed and torque characteristics?
a) Speed and torque are constant
b) Speed is constant, and torque varies
c) Speed varies, and torque is constant
d) Both speed and torque vary
Answer: b) Speed is constant, and torque varies
4. The asynchronous motor is commonly used in ___________ applications.
a) High-speed
b) Low-speed
c) Variable speed
d) High-torque
Answer: b) Low-speed
5. In an asynchronous motor, the direction of rotation can be reversed by ___________.
a) Changing the field winding polarity
b) Changing the armature winding polarity
c) Changing the direction of current flow in the field winding
d) Interchanging any two of the three phase connections
Answer: d) Interchanging any two of the three-phase connections
6. Which of the following statements is true for the asynchronous motor’s construction?
a) It has a separate field and armature winding
b) It has only a field winding and no armature winding
c) It has only an armature winding and no field winding
d) It has a squirrel cage rotor and stator windings
Answer: d) It has a squirrel cage rotor and stator windings
7. The asynchronous motor is commonly used in ___________ applications.
a) Ceiling fans
b) Washing machines
c) Industrial pumps
d) Microwave ovens
Answer: c) Industrial pumps
8. The speed of an asynchronous motor is controlled by ___________.
a) Changing the voltage
b) Changing the frequency
c) Changing the number of poles
d) Changing the type of power supply
Answer: c) Changing the number of poles
9. What is the main advantage of using an asynchronous motor?
a) High efficiency
b) Low cost
c) Smooth operation
d) Long operational life
Answer: b) Low cost
10. The asynchronous motor is suitable for ___________ applications.
a) High-torque and low-speed
b) Low-torque and high-speed
c) High-torque and high-speed
d) Low-torque and low-speed
Answer: a) High-torque and low-speed
11. Which component is responsible for the starting torque in an asynchronous motor?
a) Capacitor
b) Brushes
c) Commutator
d) Squirrel cage rotor
Answer: d) Squirrel cage rotor
12. What is the typical application of an asynchronous motor?
a) Ceiling fan
b) Vacuum cleaner
c) Electric vehicle
d) Conveyor belt
Answer: d) Conveyor belt
13. The asynchronous motor is widely used in ___________ applications.
a) Electric tools
b) Pneumatic tools
c) Hydraulic tools
d) Mechanical tools
Answer: a) Electric tools
14. In an asynchronous motor, the speed-torque characteristic is ___________.
a) Hyperbolic
b) Linear
c) Parabolic
d) Exponential
Answer: c) Parabolic
15. The asynchronous motor is also known as an ___________ motor.
a) Induction motor
b) Armature motor
c) Commutator motor
Answer: a) Induction motor
16. The asynchronous motor requires ___________ to produce a rotating magnetic field.
a) Stator winding
b) Armature winding
c) Field winding
d) Excitation winding
Answer: a) Stator winding
17. What happens if the asynchronous motor is operated on DC power?
a) The motor will not start
b) The motor will run at half speed
c) The motor will overheat
d) The motor will run at full speed
Answer: a) The motor will not start
18. Which type of load is most suitable for an asynchronous motor?
a) Constant torque
b) Constant speed
c) Variable torque
d) No-load
Answer: a) Constant torque
19. In an asynchronous motor, the torque is ___________ proportional to the slip.
a) Directly
b) Inversely
c) Exponentially
d) Not
Answer: a) Directly
20. The asynchronous motor is commonly used in ___________ applications.
a) Electric vehicles
b) Air compressors
c) Hair dryers
d) Generators
Answer: b) Air compressors
21. The asynchronous motor is not suitable for ___________ applications.
a) High-speed
b) Low-speed
c) Variable speed
d) High-torque
Answer: a) High-speed
22. What type of voltage is commonly used to power an asynchronous motor?
a) AC voltage only
b) DC voltage only
c) Pulsating DC voltage
d) Three-phase AC voltage
Answer: d) Three-phase AC voltage
23. In an asynchronous motor, the direction of rotation can be changed by
reversing the _______.
a) Voltage
b) Current flow in the stator winding
c) Current flow in the rotor winding
d) Direction of rotation of the squirrel cage rotor
Answer: d) Direction of rotation of the squirrel cage rotor
24. The asynchronous motor is commonly used in ___________ applications.
a) Power plants
b) Air conditioners
c) Domestic fans
d) Submersible pumps
Answer: c) Domestic fans
25. The efficiency of an asynchronous motor is highest at ___________.
a) No-load
b) Full load
c) Half-load
d) Overload
Answer: b) Full load
26. Which of the following statements is true for an asynchronous motor with increasing load torque?
a) Speed increases
b) Speed decreases
c) Speed remains constant
Answer: b) Speed decrease
27. The asynchronous motor is designed to operate on ___________ voltage.
a) High
b) Low
d) Variable
c) Constant
Answer: c) Constant
28. The asynchronous motor is not recommended for applications that require ___________.
a) Variable speed control
b) High efficiency
c) Low maintenance
d) Long operational life
Answer: a) Variable speed control
29. In an asynchronous motor, the stator and rotor magnetic fields are ___________.
b) Asynchronous
c) In-phase
d) Anti-phase
Answer: b) Asynchronous
30. The torque produced by an asynchronous motor is proportional to ___________.
a) Speed
b) Voltage
c) Current
d) Resistance
Answer: c) Current