BASIC NEC 2023

DC Shunt Motor Practice Test Questions

Electrical Practice Tests: DC Shunt Motor

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This DC Shunt Motor Practice Test Questions has 9 questions with detailed answers and NEC references. Take the full test, review every wrong answer, and look up the NEC article it references before moving on.

Tip: Work through Ohm's Law problems on paper — don't just read the answers, calculate them yourself.

  • Topics covered: Voltage, current, resistance, Ohm's Law, series/parallel circuits, and electrical safety.
  • Passing score: Aim for 90%+ on basic theory — these fundamentals underpin every advanced topic.
  • Questions: 9 multiple-choice, one correct answer each
9
Questions
14 min
Time
70%
Pass

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BASIC · NEC 2023
DC Shunt Motor Practice Test Questions
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DC Shunt Motor Practice Test Questions — Question List

Question 1: When the armature current is increased the speed of DC Shunt Motor ...................

  • Increases
  • Decreases
  • remains constant

Question 2: Under Normal Operation DC Shunt Motor draws a current of <em><strong>I</strong></em>. For the same constant power output if the terminal is halved, its current will be..............

  • 1/4 I
  • 1/2 I
  • 2 I

Question 3: The speed of the DC Shunt motor can be increased by:

  • Increasing the resistance in the armature current
  • increasing the resistance in the field circuit
  • decreasing the resistance in the field winding

Question 4: In a DC motor the direction of rotor rotation depends on .....................

  • Rotor power
  • Rotor voltage
  • Rotor frequency
  • Rotor current

Question 5: The back EMF produced in a DC Motor ...........

  • opposes the applied voltage
  • opposes the armature current
  • aids the applied voltage
  • aids the armature current

Question 6: The developed mechanical power in a DC motor is maximum when the back EMF is equal to ............ the applied voltage.

  • double
  • half
  • one by third

Question 7: The amount back EMF of a shunt motor will increase when ....................

  • load is increased
  • supply voltage is increased
  • field flux is strengthened
  • field flux is weekend

Question 8: The speed of the shunt motor is practically constant.

  • True
  • False

Question 9: In shunt motor the field winding is connected in ................ with the armature winding.

  • series
  • parallel
EXAM CARD BASIC
Questions9
Time limit14 min
Pass score70%
Code editionNEC 2023
DifficultyIntermediate
Last reviewedJun 2026

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Source: NEC 2026 (NFPA 70)