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#### Electronic Important MCQ interview - Electronic Engineering

Its motor resistance starts single-phase induction motor diagram. most important MCQ questions in English. Electronic MCQs for theory.

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Question 1: If a DC motor is connected across the AC supply it will?

• run at normal speed
• not run
• burn due to heat produced in the field winding by eddy currents
• run at lower speed
• Answers: burn due to heat produced in the field winding by eddy currents

Question 2: To get the speed of DC motor below the normal without wastage of electrical energy ...... is used?

• Ward Leonard control
• any of the above method
• rheostatic control
• none of the above method

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?

• none of the above
• resultant force on conductor
• movement of conductor
• current in the conductor
• Answers: current in the conductor

Question 4: Which DC motor will preferred, for machine tools?

• Series motor
• Shunt motor
• Cumulative compound motor
• Differential compound motor

Question 5: For starting a DC motor a starter is. required because?

• it limits the speed of the motor
• none of the above
• it limits the starting current to a safe value
• it starts the rotor
• Answers: it limits the starting current to a safe value

Question 6: The speed of a DC series, motor is?

• proportional to the armature current
• proportional to the square of the armature current
• proportional to field current
• inversely proportional to the armature current
• Answers: inversely proportional to the armature current

Question 7: Which DC motor is generally preferred for cranes and hoists?

• Cumulatively compounded motor
• Series motor
• Shunt motor
• Differentially compounded motor

Question 8: As the load is increased the speed of dc shunt motor will?

• remains unchanged
• increase proportionately
• Reduce slightly
• increase slightly

Question 9: In a alternator when the load power factor is unity?

• The armature flux will be cross-demagnetising
• The armature flux will be demagnetising
• The armature flux will reduce to zero
• none of the above
• Answers: The armature flux will be cross-demagnetising

Question 10: What is the effect produced by the electric current in an electric motor?

• Heating effect only
• Magnetic effect only
• Heating as well as chemical effect
• Heating as well as magnetic effect
• Answers: Heating as well as magnetic effect

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