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MCQs

Total Questions : 149 | Page 11 of 15 pages
Question 101. . Which coil would be used as a step-up transformer primary if coil number 1 has 100 more turns than coil number 2?
  1.    The coil windings must be the same.
  2.    coil 1
  3.    The coil ratio is too small.
  4.    coil 2
 Discuss Question
Answer: Option D. -> coil 2
Question 102. . 
With 100 Vac applied to the primary of a transformer so that it draws 500 mA, what will be the 300 Vac secondary current?
  1.    1500 mA
  2.    200 mA
  3.    167 mA
  4.    150 mA
 Discuss Question
Answer: Option C. -> 167 mA
Question 103. . The output phase for a transformer is:
  1.    in phase with the input
  2.    out of phase with the input
  3.    dependent on the direction of the primary and secondary windings
  4.    dependent on the frequency of the primary source
 Discuss Question
Answer: Option C. -> dependent on the direction of the primary and secondary windings
Question 104. . When the transformer secondary is not loaded:
  1.    secondary voltage increases
  2.    no secondary current flows
  3.    no secondary voltage is present
  4.    secondary current increases
 Discuss Question
Answer: Option B. -> no secondary current flows
Question 105. . Opposition to current flow without the dissipation of energy is called:
  1.    resistance
  2.    inductive reactance
  3.    counter emf
  4.    impedance
 Discuss Question
Answer: Option B. -> inductive reactance
Question 106. . What is the total inductance of a 5 H and a 100 mH coil connected in parallel?
  1.    4.76 mH
  2.    33.3 mH
  3.    98.0 mH
  4.    150.0 mH
 Discuss Question
Answer: Option C. -> 98.0 mH
Question 107. . A transformer is used:
  1.    to couple electric energy from one dc circuit to another
  2.    to couple electric energy from an ac circuit to a dc circuit
  3.    to couple electric energy from a dc circuit to an ac circuit
  4.    to couple electric energy from one ac circuit to another
 Discuss Question
Answer: Option D. -> to couple electric energy from one ac circuit to another
Question 108. . What is the impedance of a 1 kHz series RL circuit when R and XL are both 1000 ohms?
  1.    500 ohms
  2.    1000 ohms
  3.    1414 ohms
  4.    2000 ohms
 Discuss Question
Answer: Option C. -> 1414 ohms
Question 109. . When an electromagnet reaches maximum strength, it is considered to be:
  1.    in field condition
  2.    at saturation
  3.    inhibited
  4.    at field strength
 Discuss Question
Answer: Option B. -> at saturation
Question 110. . What is remanence?
  1.    reactance
  2.    reluctance
  3.    retentitivity
  4.    resistance
 Discuss Question
Answer: Option C. -> retentitivity

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