Induction Motor MCQ Questions Part 2 with solutions.
Contents
- 1 A 3-phase delta connected induction motor is carrying too heavy load and one of its fuses blows out. Afterwards the motor
- 2 The stator of 3-phase induction motor produces magnetic field that is
- 3 Which of following is correct regarding the rotor speed in a 3 -phase induction motor? It is
- 4 Direction of rotation of field in a 3-phase induction motor is contingent on which of following factors
- 5 The slip and rotor current in a 3-phase induction motor are
- 6 If the slip of induction motor increases, then, what happens to the current in the stator winding. It
- 7 DOL starting of induction motors is generally restricted for
- 8 If frequency of 3-phase supply to the stator of 3-phase induction motor is increased. What happens to synchronous speed. It
- 9 Once the starting winding of a single-phase induction motor is disconnected from supply, it stays to run only on
- 10 An induction motor is favored over a DC motor since it
A 3-phase delta connected induction motor is carrying too heavy load and one of its fuses blows out. Afterwards the motor
A 3-phase delta connected induction motor is carrying too heavy load and one of its fuses blows out. Afterwards the motor:
- Will stop and carry heavy current causing permanent damage to its winding
- Will continue running with one burning phase
- Will continue running without any harm to the winding
- Will continue running burning its two phase
Correct answer: 1. Will stop and carry heavy current causing permanent damage to its winding
The stator of 3-phase induction motor produces magnetic field that is
The stator of 3-phase induction motor produces magnetic field that is
- Steady in nature
- Rotating
- Alternating
- None of above
Correct answer: 2. Rotating
Which of following is correct regarding the rotor speed in a 3 -phase induction motor? It is
Which of following is correct regarding the rotor speed in a 3 -phase induction motor? It is
- Smaller than synchronous speed
- Greater than synchronous speed
- Equal to synchronous speed
- None of these
Correct answer: 1. Smaller than synchronous speed
Direction of rotation of field in a 3-phase induction motor is contingent on which of following factors
Direction of rotation of field in a 3-phase induction motor is contingent on which of following factors:
- Number of poles
- Phase sequence of supply voltage
- Magnitude of supply voltage
- Frequency of AC supply
Correct answer: 2. Phase sequence of supply voltage
The slip and rotor current in a 3-phase induction motor are
The slip and rotor current in a 3-phase induction motor are
- Directly proportional to each other
- Inversely proportional to each other
- Independent of each other
- None of the above
Correct answer: 1. Directly proportional to each other
If the slip of induction motor increases, then, what happens to the current in the stator winding. It
If the slip of induction motor increases, then, what happens to the current in the stator winding. It
- Is decreased
- Is increased
- Remains unchanged
- None of the above
Correct answer: 2. Is increased
DOL starting of induction motors is generally restricted for
DOL starting of induction motors is generally restricted for:
- Variable speed motors
- High horsepower motors
- High speed motors
- Low horsepower motors
Correct answer: 4. Low horsepower motors
If frequency of 3-phase supply to the stator of 3-phase induction motor is increased. What happens to synchronous speed. It
If frequency of 3-phase supply to the stator of 3-phase induction motor is increased. What happens to synchronous speed. It
- Is increased
- Is decreased
- Remains constant
- None of these
Correct answer: 1. Is increased
Once the starting winding of a single-phase induction motor is disconnected from supply, it stays to run only on
Once the starting winding of a single phase induction motor is disconnected from supply, it stays to run only on:
- Rotor winding
- Running winding
- Compensating winding
- Field winding
Correct answer: 2. Running winding
An induction motor is favored over a DC motor since it
An induction motor is favored over a DC motor since it
- Provides fine speed control
- Provides high starting torque
- Is simple and rugged in construction
- None of these
Correct answer: 3. Is simple and rugged in construction