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MCQs

Total Questions : 141 | Page 4 of 15 pages
Question 31. Thermal compensation can be provided in a Wheatstone bridge by ________
  1.    using more than one resistive sensor
  2.    making use of a heat sink
  3.    using cooling fans
  4.    immersing the circuit into a liquid
 Discuss Question
Answer: Option A. -> using more than one resistive sensor
Answer: (a).using more than one resistive sensor
Question 32. Wheatstone bridge can’t be used for measurement of _________
  1.    high resistance
  2.    medium resistance
  3.    low resistance
  4.    accurate resistance
 Discuss Question
Answer: Option A. -> high resistance
Answer: (a).high resistance
Question 33. Cost of maintenance of Wheatstone bridge is _________
  1.    low
  2.    high
  3.    depends on the components
  4.    depends on the source e.m.f
 Discuss Question
Answer: Option B. -> high
Answer: (b).high
Question 34. What is the effect of galvanometer on measurement of high resistance?
  1.    no effect
  2.    depends on the e.m.f source
  3.    galvanometer becomes insensitive to an imbalance
  4.    depends on the type of galvanometer used
 Discuss Question
Answer: Option C. -> galvanometer becomes insensitive to an imbalance
Answer: (c).galvanometer becomes insensitive to an imbalance
Question 35. What is the effect of heat on the resistances in a Wheatstone bridge?
  1.    no effect
  2.    increases the voltage drop across the circuit
  3.    decreases the current flowing through the circuit
  4.    causes a permanent change in the resistance values
 Discuss Question
Answer: Option D. -> causes a permanent change in the resistance values
Answer: (d).causes a permanent change in the resistance values
Question 36. Effect of high dc on Wheatstone bridge.
  1.    no effect
  2.    not susceptible
  3.    burns the circuit
  4.    increases the temperature
 Discuss Question
Answer: Option B. -> not susceptible
Answer: (b).not susceptible
Question 37. What is the effect of lead wires on the Wheatstone bridge?
  1.    no effect
  2.    stabilizes the system
  3.    desensitizes the system
  4.    increases the resistance of the circuit
 Discuss Question
Answer: Option C. -> desensitizes the system
Answer: (c).desensitizes the system
Question 38. Why a Wheatstone bridge can’t be used for signal conditioning?
  1.    due to the galvanometer
  2.    due to excessive current flow
  3.    due to the e.m.f source used
  4.    due to lead wires
 Discuss Question
Answer: Option D. -> due to lead wires
Answer: (d).due to lead wires
Question 39. A Wheatstone bridge may not give accurate readings if _________
  1.    it is not balanced
  2.    it is balanced
  3.    the voltage drop across the circuit is maximum
  4.    excessive current flows through the circuit
 Discuss Question
Answer: Option A. -> it is not balanced
Answer: (a).it is not balanced
Question 40. How to minimize the drift in the value of resistance measured using a Wheatstone bridge?
  1.    by using a high precision null detector
  2.    by keeping the lead wire resistances within 0.2 mΩ
  3.    by using a e.m.f source of minimum value
  4.    by minimizing the flow of current
 Discuss Question
Answer: Option B. -> by keeping the lead wire resistances within 0.2 mΩ
Answer: (b).by keeping the lead wire resistances within 0.2 mΩ

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