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MCQs

Total Questions : 124 | Page 4 of 13 pages
Question 31. An ideal ammeter has ___________ resistance.
  1.    Low
  2.    Infinite
  3.    Zero
  4.    High
 Discuss Question
Answer: Option C. -> Zero
Question 32. LVDT is an/a ___________ transducer.
  1.    Magneto-strict ion
  2.    Inductive
  3.    Resistive
  4.    Eddy current
 Discuss Question
Answer: Option D. -> Eddy current
Question 33. Piezo – electric transducers work when we apply _____________ to it.
  1.    Mechanical force
  2.    Vibrations
  3.    Illuminations
  4.    Heat
 Discuss Question
Answer: Option D. -> Heat
Question 34. A chopper amplifier
  1.    Converts AC signal from low frequency to high frequency
  2.    Converts DC signal from low frequency to high frequency
  3.    Converts AC signal from low frequency to DC high frequency
  4.    Converts DC signal from low frequency to high frequency
 Discuss Question
Answer: Option D. -> Converts DC signal from low frequency to high frequency
Question 35. The sensitivity factor of strain gauge is normally of the order of
  1.    1 to 1.5
  2.    1.5 to 2.0
  3.    0.5 to 1.0
  4.    5 to 10
 Discuss Question
Answer: Option B. -> 1.5 to 2.0
Question 36. The change in resistance of a metal wire owing to strain is due toS1: Change in dimension of wire expressed by factor (1-2µ)S2: Change in resistance ?
  1.    S1 is true & S2 is false
  2.    S2 is true & S1 is false
  3.    Both S1 & S2 are true
  4.    Both S1 & S2 are false
 Discuss Question
Answer: Option B. -> S2 is true & S1 is false
Question 37. The amplifier gain varies with frequency. This happens mainly due to
  1.    Miller effect
  2.    Presence of external and internal capacitance
  3.    Logarithmic increase in its output
  4.    Inter stage transformer
 Discuss Question
Answer: Option B. -> Presence of external and internal capacitance
Question 38. The negative feed back in an amplifier
  1.    Reduces voltage gain
  2.    Increases the voltage gain
  3.    Increases the gain band width product
  4.    Reduces the input impedances
 Discuss Question
Answer: Option A. -> Reduces voltage gain
Question 39. Which of the following are piezo electric substances?
1. Barium titanate
2. Lead titanate
3. Lead Zirconate
4. Cadmium and sulphate
  1.    1, 2 and 4
  2.    1, 3 and 4
  3.    1, 2 and 3
  4.    2, 3 and 4
 Discuss Question
Answer: Option C. -> 1, 2 and 3
Question 40. The improper response time of the amplifier in the biomedical recorders
  1.    Affects the gain of the amplifier
  2.    Delays the signals
  3.    Changes the shape of the waveform of the signal
  4.    Attenuates the signals
 Discuss Question
Answer: Option C. -> Changes the shape of the waveform of the signal

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