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MCQs

Total Questions : 141 | Page 5 of 15 pages
Question 41. What is the significance of measuring low resistances?
  1.    voltage drop across the circuit is high
  2.    contact and lead resistances are appreciable
  3.    there is no power loss
  4.    no current flows through the bridge circuit
 Discuss Question
Answer: Option B. -> contact and lead resistances are appreciable
Answer: (b).contact and lead resistances are appreciable
Question 42. Which is not a source of error in the measurement of low resistance?
  1.    contact resistance drops at the leads
  2.    thermal e.m.f
  3.    temperature effect
  4.    power dissipation through the circuit
 Discuss Question
Answer: Option A. -> contact resistance drops at the leads
Answer: (a).contact resistance drops at the leads
Question 43. Low resistance refers to _________
  1.    resistances of the order of 1ῼ
  2.    resistances of the order of 1kῼ
  3.    resistances of the order of 1mῼ
  4.    resistances of the order of 1Mῼ
 Discuss Question
Answer: Option A. -> resistances of the order of 1ῼ
Answer: (a).resistances of the order of 1ῼ
Question 44. Which is the most popular method for measuring low resistance?
  1.    ammeter-voltmeter method
  2.    potentiometer method
  3.    kelvin double bridge method
  4.    ducter ohmmeter method
 Discuss Question
Answer: Option C. -> kelvin double bridge method
Answer: (c).kelvin double bridge method
Question 45. How is the voltage drop across a low resistance related to lead resistance?
  1.    it contains contact resistance
  2.    it depends on the magnitude of voltage drop
  3.    it depends on the type of null detector used
  4.    It does not contain any contact resistance
 Discuss Question
Answer: Option D. -> It does not contain any contact resistance
Answer: (d).It does not contain any contact resistance
Question 46. How is the contact resistance related to the circuit while measuring a low resistance?
  1.    independent of the type of resistance
  2.    it is negligible
  3.    depends on the e.m.f source
  4.    it is very high
 Discuss Question
Answer: Option B. -> it is negligible
Answer: (b).it is negligible
Question 47. Accuracy of Kelvin bridge is of the order of _________
  1.    ±0.5 to ±2 %
  2.    ±0.05 to ±0.02 %
  3.    ±0.05 to ±0.2 %
  4.    ±0.005 to ±0.02 %
 Discuss Question
Answer: Option C. -> ±0.05 to ±0.2 %
Answer: (c).±0.05 to ±0.2 %
Question 48. The range of resistance measured in a Kelvin bridge is _________
  1.    10Ω to 10 mΩ
  2.    1Ω to 10 μΩ
  3.    0.01Ω to 10 MΩ
  4.    0.1Ω to 10 nΩ
 Discuss Question
Answer: Option B. -> 1Ω to 10 μΩ
Answer: (b).1Ω to 10 μΩ
Question 49. What is the balance equation of Kelvin bridge?
  1.    Rₓ = \(\frac{R_2 R_3}{R_1}\)
  2.    Rₓ = \(\frac{R_1 R_2}{R_3}\)
  3.    Rₓ = \(\frac{R_1}{R_2}\)
  4.    Rₓ = \(\frac{R_1 R_3}{R_2}\)
 Discuss Question
Answer: Option D. -> Rₓ = \(\frac{R_1 R_3}{R_2}\)
Answer: (d).Rₓ = \(\frac{R_1 R_3}{R_2}\)
Question 50. Kelvin’s bridge consists of _________
  1.    double bridge
  2.    single bridge
  3.    half bridge
  4.    three fourth bridge
 Discuss Question
Answer: Option A. -> double bridge
Answer: (a).double bridge

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