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MCQs

Total Questions : 199 | Page 11 of 20 pages
Question 101. What is the value of the form factor for sinusoidal current?
  1.    π/2
  2.    π/4
  3.    2π
  4.    π/√2
 Discuss Question
Answer: Option A. -> π/2
Answer: (a).π/2
Question 102. What is the correct expression for the form factor?
  1.    Iᵣₘₛ * Iₐᵥ
  2.    Iᵣₘₛ / Iₐᵥ
  3.    Iᵣₘₛ + Iₐᵥ
  4.    Iᵣₘₛ – Iₐᵥ
 Discuss Question
Answer: Option B. -> Iᵣₘₛ / Iₐᵥ
Answer: (b).Iᵣₘₛ / Iₐᵥ
Question 103. For a direct current, the rms current is ________ the mean current.
  1.    Greater than
  2.    Less than
  3.    Equal to
  4.    Not related to
 Discuss Question
Answer: Option C. -> Equal to
Answer: (c).Equal to
Question 104. Impulse testing of transformers is done to determine the ability of
  1.    bushings to withstand vibration
  2.    insulation to withstand transient voltages
  3.    windings to withstand voltage fluctuations
  4.    all of the above
 Discuss Question
Answer: Option B. -> insulation to withstand transient voltages


insulation to withstand transient voltages


Question 105. Moles bridge is used to measure
  1.    properties of dielectric at dc
  2.    dispersion in insulation
  3.    high frequency high voltages
  4.    modulation ratio frequencies
 Discuss Question
Answer: Option B. -> dispersion in insulation


dispersion in insulation


Question 106. Insulators for high voltage applications are tested for
  1.    power frequency tests
  2.    impulse tests
  3.    both (A) and (B) above
  4.    none of the above
 Discuss Question
Answer: Option C. -> both (A) and (B) above


both (A) and (B) above


Question 107. Switching surge is
  1.    high voltage dc
  2.    high voltage ac
  3.    short duration transient voltage
  4.    hyperbolically dying voltage
 Discuss Question
Answer: Option C. -> short duration transient voltage


short duration transient voltage


Question 108. Corona results in
  1.    improvement in power factor
  2.    increased capacitive reactance of transmission lines
  3.    radio interference
  4.    better regulation
 Discuss Question
Answer: Option C. -> radio interference


radio interference


Question 109. Electro-mechanical breakdown of solid insulating materials occurs due to
  1.    magnetic bum
  2.    vibrations
  3.    mechanical stresses produced by the electrical field
  4.    electrical stresses produced by the voltage fluctuations
 Discuss Question
Answer: Option C. -> mechanical stresses produced by the electrical field


mechanical stresses produced by the electrical field


Question 110. Liquids are generally used as insulating materials up to voltage stresses of about
  1.    100 MV/cm
  2.    50 MV/cm
  3.    50 kV/cm
  4.    500 V/cm
 Discuss Question
Answer: Option C. -> 50 kV/cm


50 kV/cm


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