Electronic Important MCQ interview - Electronic Engineering
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Its motor resistance starts single-phase induction motor diagram. most important MCQ questions in English. Electronic MCQs for theory.
- run at normal speed
- not run
- burn due to heat produced in the field winding by eddy currents
- run at lower speed
Question 1: If a DC motor is connected across the AC supply it will?
Answers: burn due to heat produced in the field winding by eddy currents
- Ward Leonard control
- any of the above method
- rheostatic control
- none of the above method
Question 2: To get the speed of DC motor below the normal without wastage of electrical energy ...... is used?
Answers: Ward Leonard control
- none of the above
- resultant force on conductor
- movement of conductor
- current in the conductor
Question 3: According to Fleming's left-hand-rule, when the forefinger points in the direction of the field or flux, middle finger wilt point in the direction of?
Answers: current in the conductor
- Series motor
- Shunt motor
- Cumulative compound motor
- Differential compound motor
Question 4: Which DC motor will preferred, for machine tools?
Answers: Shunt motor
- it limits the speed of the motor
- none of the above
- it limits the starting current to a safe value
- it starts the rotor
Question 5: For starting a DC motor a starter is. required because?
Answers: it limits the starting current to a safe value
- proportional to the armature current
- proportional to the square of the armature current
- proportional to field current
- inversely proportional to the armature current
Question 6: The speed of a DC series, motor is?
Answers: inversely proportional to the armature current
- Cumulatively compounded motor
- Series motor
- Shunt motor
- Differentially compounded motor
Question 7: Which DC motor is generally preferred for cranes and hoists?
Answers: Series motor
- remains unchanged
- increase proportionately
- Reduce slightly
- increase slightly
Question 8: As the load is increased the speed of dc shunt motor will?
Answers: Reduce slightly
- The armature flux will be cross-demagnetising
- The armature flux will be demagnetising
- The armature flux will reduce to zero
- none of the above
Question 9: In a alternator when the load power factor is unity?
Answers: The armature flux will be cross-demagnetising
- Heating effect only
- Magnetic effect only
- Heating as well as chemical effect
- Heating as well as magnetic effect
Question 10: What is the effect produced by the electric current in an electric motor?
Answers: Heating as well as magnetic effect
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Total Questions Attempted: 0
Correct: 0 Wrong: 0
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