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MCQs

Total Questions : 141 | Page 8 of 15 pages
Question 71. After earthing, the different parts of an electrical machinery are at _________
  1.    infinite potential
  2.    intermediate potential
  3.    zero potential
  4.    undefined potential
 Discuss Question
Answer: Option C. -> zero potential
Answer: (c).zero potential
Question 72. Specific resistance of soil is _________
  1.    changes from soil to soil
  2.    is constant
  3.    depends on the circuit connected to it
  4.    depends on the supply voltage
 Discuss Question
Answer: Option A. -> changes from soil to soil
Answer: (a).changes from soil to soil
Question 73. The readings of polar type potentiometer are I = 12.4∠27.5°, V = 31.5∠38.4°. Then, reactance of the coil will be ________
  1.    2.51 Ω
  2.    2.56 Ω
  3.    2.54 Ω
  4.    2.59 Ω
 Discuss Question
Answer: Option C. -> 2.54 Ω
Answer: (c).2.54 Ω
Question 74. Connection of the various parts of a circuit to earth has a _________
  1.    medium resistance
  2.    high resistance
  3.    very high resistance
  4.    very low resistance
 Discuss Question
Answer: Option D. -> very low resistance
Answer: (d).very low resistance
Question 75. The voltage drop across a standard resistor of 0.2 Ω is balanced at 83 cm. Find the magnitude of the current, if the standard cell emf of 1.53 V is balanced at 42 m.
  1.    13.04 A
  2.    10 A
  3.    14.95 A
  4.    12.56 A
 Discuss Question
Answer: Option C. -> 14.95 A
Answer: (c).14.95 A
Question 76. Low resistance is measured by ___________
  1.    De-Sauty’s bridge
  2.    Maxwell’s bridge
  3.    Kelvin double bridge
  4.    Wein’s bridge
 Discuss Question
Answer: Option C. -> Kelvin double bridge
Answer: (c).Kelvin double bridge
Question 77. A slide wire potentiometer has 10 wires of 2 m each. With the help of a standard voltage source of 1.045 V, it is standardized by keeping the jockey at 104.5 cm. If the resistance of potentiometer wires is 2000 Ω, then the value of working current is?
  1.    1 mA
  2.    10 mA
  3.    0.1 mA
  4.    0.5 mA
 Discuss Question
Answer: Option B. -> 10 mA
Answer: (b).10 mA
Question 78. The resistance can be measured most accurately by _________
  1.    Voltmeter-Ammeter method
  2.    Bridge method
  3.    Multimeter
  4.    Megger
 Discuss Question
Answer: Option B. -> Bridge method
Answer: (b).Bridge method
Question 79. A resistor of 10 kΩ with the tolerance of 5% is connected in parallel with 5 kΩ resistors of 10% tolerance. What is the tolerance limit for a parallel network?
  1.    9%
  2.    12.4%
  3.    8.33%
  4.    7.87%
 Discuss Question
Answer: Option C. -> 8.33%
Answer: (c).8.33%
Question 80. Which of the following method is used for the measurement of Medium Resistance?
  1.    Kelvin’s double bridge method
  2.    Carey-Foster bridge method
  3.    Anderson Bridge
  4.    Direct-Deflection method
 Discuss Question
Answer: Option B. -> Carey-Foster bridge method
Answer: (b).Carey-Foster bridge method

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