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MCQs

Total Questions : 327 | Page 29 of 33 pages
Question 281. The frequency of domestic power supply in Pakistan is_________?
  1.    200 Hz
  2.    100 Hz
  3.    60 Hz
  4.    50 Hz
 Discuss Question
Answer: Option D. -> 50 Hz
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 282. The inductance of a coil can be increased by_________?
  1.    increasing core length
  2.    decreasing the number of turns
  3.    decreasing the diameter of the former
  4.    choosing core material having high relative permeability
 Discuss Question
Answer: Option D. -> choosing core material having high relative permeability
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 283. In a three-phase supply floating neutral is undesirable because it way give rise to___________?
  1.    high voltage across the load
  2.    low voltage across the load
  3.    unequal line voltages across the load
  4.    minimun voltage across the load
 Discuss Question
Answer: Option C. -> unequal line voltages across the load
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 284. Which of the following waves has the highest value of peak factor ___________?
  1.    Square wave
  2.    Sine wave
  3.    Half wave rectified sine wave
  4.    Triangular wave
 Discuss Question
Answer: Option C. -> Half wave rectified sine wave
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 285. The phosphors for which of the following pair are 180° out of phase for VL, VC and VR______?
  1.    Vc and VR
  2.    VL and VR
  3.    Vc and VL
  4.    none of the above
 Discuss Question
Answer: Option C. -> Vc and VL
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 286. The r.m.s. value of half wave rectified sine wave is 200 V. The r.m.s. value of full wave rectified AC. will be___________?
  1.    282.8 V
  2.    141.4 V
  3.    111 V
  4.    100 V
 Discuss Question
Answer: Option A. -> 282.8 V
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 287. At very low frequencies a series R-C circuit behaves as almost purely___________?
  1.    resistive
  2.    inductive
  3.    capacitive
  4.    none of the above
 Discuss Question
Answer: Option C. -> capacitive
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 288. The power is measured in terms of decibles in case of_________?
  1.    electronic equipment
  2.    transformers
  3.    current transformers
  4.    auto transformers
 Discuss Question
Answer: Option A. -> electronic equipment
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 289. In an A.C. circuit power is dissipated in____________?
  1.    resistance only
  2.    inductance only
  3.    capacitance only
  4.    none of the above
 Discuss Question
Answer: Option A. -> resistance only
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 290. Skin effect occurs when a conductor carries current at_______ frequencies
  1.    very low
  2.    low
  3.    medium
  4.    high
 Discuss Question
Answer: Option D. -> high
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

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