Different types of motors used in various industries - Electronic Engineering
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What are the different types of motors used in various industries? · 2. Explain the working principle of an Induction Motor. load speed of which of the following motors will be highest? (a) Shunt motor (b) Series motor.
- directly proportional to the armature current
- proportional to the square of the current
- independent of armature current
- inversely proportional to the armature current
Question 1: In a DC shunt motor, speed is?
Answers: independent of armature current
- Batteries
- AC mains
- DC mains
- IC Engines
Question 2: In hazardous area of gassy mines, material transportation is done by vehicles powered by?
Answers: Batteries
- Frequency of magnetic reversals
- Maximum value of flux density
- Volume and grade of iron
- Rate of flow of ventilating air
Question 3: The hysteresis loss in a DC machine least depends on?
Answers: Rate of flow of ventilating air
- variable speed motors
- small horse power motors
- high speed motors
- open frame type motors
Question 4: A brake test on DC motors is usually restricted to?
Answers: small horse power motors
- Starting torque
- Operating speed
- Full-load current
- All of the above
Question 5: If the supply voltage for a DC motor is increased, which of the following will decrease?
Answers: Full-load current
- DC Generators
- none of the above
- both (a) and (d)
- DC Motors
Question 6: The generated EMF and the current are in the opposite direction in case of?
Answers: DC Motors
- excessive starting period
- motor starting in wrong direction
- large in rush of current
- tripping of the circuit breaker
Question 7: While starting a differential compound motor, it is best to short the series field in order to avoid ?
Answers: motor starting in wrong direction
- Shunt motor
- Differentially compounded motor
- Series motor
- Cumulatively compounded motor
Question 8: Which DC motor has got maximum self relieving property?
Answers: Series motor
- this will make armature to take heavy current, possibly burning it
- motor will come to stop
- this will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses
- nothing will happen to motor
Question 9: If a DC shunt motor is working at full load and if shunt field circuit suddenly opens?
Answers: this will make armature to take heavy current, possibly burning it
- Frame
- Shaft
- Stator
- Commutator
Question 10: By looking at which part of the motor, it can be easily confirmed that a particular motor is DC motor ?
Answers: Commutator
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