1. What type of motor is a hysteresis motor?
a) AC motor
b) DC motor
d) Hysteresis motor
Answer: d) Hysteresis motor
2. The hysteresis motor operates on ___________ power.
a) Single-phase
b) Two-phase
c) Three-phase
d) Four-phase
Answer: a) Single-phase
3. Which of the following statements is true for the hysteresis 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: a) Speed and torque are constant
4. The hysteresis motor is commonly used in ___________ applications.
a) High-speed
b) Low-speed
c) Variable speed
d) High-torque
Answer: a) High-speed
5. In a hysteresis 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) Changing the direction of current flow in the armature winding
Answer: d) Changing the direction of current flow in the armature winding
6. Which of the following statements is true for the hysteresis 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 rotor made of hysteresis material
Answer: d) It has a rotor made of hysteresis material
7. The hysteresis motor is commonly used in ___________ applications.
a) Ceiling fans
b) Washing machines
c) Industrial drills
d) Microwave ovens
Answer: d) Microwave ovens
8. The speed of a hysteresis 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: b) Changing the frequency
9. What is the main advantage of using a hysteresis motor?
a) High efficiency
b) Low cost
c) Smooth operation
d) Long operational life
Answer: a) High efficiency
10. The hysteresis 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: b) Low-torque and high-speed
11. Which component is responsible for the starting torque in a hysteresis motor?
a) Capacitor
b) Brushes
c) Commutator
d) Hysteresis rotor
Answer: d) Hysteresis rotor
12. What is the typical application of a hysteresis motor?
a) Ceiling fan
b) Vacuum cleaner
c) Electric vehicle
d) Turntable
Answer: d) Turntable
13. The hysteresis motor is widely used in ___________ applications.
a) Electric tools
b) Pneumatic tools
c) Hydraulic tools
d) Mechanical tools
Answer: d) Mechanical tools
14. In a hysteresis motor, the speed-torque characteristic is ___________.
a) Hyperbolic
b) Linear
c) Parabolic
d) Exponential
Answer: a) Hyperbolic
15. The hysteresis motor is also known as a ___________ motor.
a) Single-phase motor
b) Series-wound motor
c) Commutator motor
d) Synchronous motor
Answer: a) Single-phase motor
16. The hysteresis motor requires ___________ to produce a rotating magnetic field.
a) Stator winding
b) Armature winding
c) Field winding
d) Excitation winding
Answer: c) Field winding
17. What happens if the hysteresis 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 a hysteresis motor?
a) Constant torque
b) Constant speed
c) Variable torque
d) No-load
Answer: b) Constant speed
19. In a hysteresis motor, the torque is ___________ proportional to the slip.
a) Directly
b) Inversely
c) Exponentially
d) Not
Answer: d) Not
20. The hysteresis motor is commonly used in ___________ applications.
a) Electric vehicles
b) Air compressors
c) Clocks
d) Generators
Answer: c) Clocks
21. The hysteresis motor is not suitable for ___________ applications.
a) High-speed
b) Low-speed
c) Variable speed
d) High-torque
Answer: c) Variable speed
22. What type of voltage is commonly used to power a hysteresis motor?
a) AC voltage only
b) DC voltage only
c) Pulsating DC voltage
d) Single-phase AC voltage
Answer: d) Single-phase AC voltage
23. In a hysteresis motor, the direction of rotation can be changed by reversing the ___________.
a) Voltage
b) Current flow in the armature winding
c) Current flow in the field winding
d) Direction of rotation of the hysteresis rotor
Answer: d) Direction of rotation of the hysteresis rotor
24. The hysteresis motor is commonly used in ___________ applications.
a) Power plants
b) Microwave Turntables
c) Domestic fans
d) Submersible pumps
Answer: b) Microwave Turntables
25. The efficiency of a hysteresis motor is highest at ___________.
a) No-load
b) Full load
c) Half-load
d) Overload
Answer: a) No-load
26. Which of the following statements is true for a hysteresis motor with increasing load torque?
a) Speed increases
b) Speed decreases
c) Speed remains constant
d) Speed becomes zero
Answer: a) Speed increases
27. The hysteresis motor is designed to operate on ___________ voltage.
a) High
b) Low
c) Constant
d) Variable
Answer: c) Constant
28. The hysteresis 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 a hysteresis motor, the stator and rotor magnetic fields are ___________.
a) Synchronous
b) Shunt Motor
c) In-phase
d) Anti-phase
Answer: a) Synchronous
30. The torque produced by a hysteresis motor is proportional to ___________.
a) Speed
b) Voltage
c) Current
d) Resistance
Answer: a) Speed