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MCQs

Total Questions : 141 | Page 9 of 15 pages
Question 81. A setup is used to measure resistance R. The ammeter and voltmeter resistance are 0.01 Ω and 2000 Ω respectively. Their readings are 2 A and 180 V respectively, giving a measured resistance of 90 Ω. The percentage error in the measurement is?
  1.    2.25 %
  2.    2.35 %
  3.    4.5 %
  4.    4.71 %
 Discuss Question
Answer: Option D. -> 4.71 %
Answer: (d).4.71 %
Question 82. A 35 V DC supply is connected across a resistance in series with an unknown resistance R. a voltmeter having a resistance of 1.2 kΩ is connected across 600 Ω resistance and reads 5 V. The value of the known resistance is 600 Ω. The value of resistance R will be?
  1.    120 Ω
  2.    400 Ω
  3.    1.8 kΩ
  4.    2.4 kΩ
 Discuss Question
Answer: Option D. -> 2.4 kΩ
Answer: (d).2.4 kΩ
Question 83. A DC ammeter has a resistance of 0.1 Ω and its current range is 0-100 A. If the range is to be extended to 0-500 A, the meter requires which of the following shunt resistance?
  1.    0.010 Ω
  2.    0.011 Ω
  3.    0.025 Ω
  4.    1.0 Ω
 Discuss Question
Answer: Option C. -> 0.025 Ω
Answer: (c).0.025 Ω
Question 84. A DC ammeter is rated for 15 A, 250 V. The meter constant is 14.4 A-s/rev. The meter constant at rated voltage may be expressed as __________
  1.    3750 rev/kW-h
  2.    3600 rev/kW-h
  3.    1000 rev/kW-h
  4.    960 rev/kW-h
 Discuss Question
Answer: Option C. -> 1000 rev/kW-h
Answer: (c).1000 rev/kW-h
Question 85. A 100 μA ammeter has an internal resistance of 100 Ω. The range is to be extended to 500 μA. The shunt required is of resistance __________
  1.    20.0 Ω
  2.    22.22 Ω
  3.    25.0 Ω
  4.    50.0 Ω
 Discuss Question
Answer: Option C. -> 25.0 Ω
Answer: (c).25.0 Ω
Question 86. What happens to the balance condition, if the source and detector are interchanged?
  1.    increases by a factor of 2
  2.    reduces to half
  3.    remains unchanged
  4.    independent of the type of source and detector
 Discuss Question
Answer: Option C. -> remains unchanged
Answer: (c).remains unchanged
Question 87. The simplest type of bridge used for the measurement of medium resistances is known as _________
  1.    Kelvin
  2.    Schering
  3.    Anderson
  4.    Wheatstone
 Discuss Question
Answer: Option D. -> Wheatstone
Answer: (d).Wheatstone
Question 88. What is the relation between the balance equation and the magnitude of input voltage?
  1.    directly proportional
  2.    independent
  3.    inversely proportional
  4.    depends on the null indicator
 Discuss Question
Answer: Option B. -> independent
Answer: (b).independent
Question 89. Accuracy of bridge circuit depends on _________
  1.    component values
  2.    null detector
  3.    voltage source
  4.    current source
 Discuss Question
Answer: Option A. -> component values
Answer: (a).component values
Question 90. How is the measurement accuracy in a bridge circuit?
  1.    high
  2.    low
  3.    medium
  4.    inaccurate
 Discuss Question
Answer: Option A. -> high
Answer: (a).high

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