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MCQs

Total Questions : 1634 | Page 15 of 164 pages
Question 141. A first order system with a time constant of 1 min is subjected to frequency response analysis. At an input frequency of 1 radian/min, the phase shift is
  1.    45°
  2.    -90°
  3.    -180°
  4.    -45°
 Discuss Question
Answer: Option D. -> -45°
Question 142. Photoelectric pyrometers are suitable in the temperature range of __________ °C.
  1.    400-1600
  2.    800-1600
  3.    800-2500
  4.    400-1000
 Discuss Question
Answer: Option B. -> 800-1600
Question 143. A mercury thermometer can not be used to measure the temperature below the freezing point of mercury, which is __________ °C.
  1.    -38.9
  2.    -11.9
  3.    -60.9
  4.    -80.9
 Discuss Question
Answer: Option A. -> -38.9
Question 144. Mercury thermometer is commonly used for low temperature measruement. The freezing point and boiling point of mercury are respectively __________ °C.
  1.    - 39 and 350
  2.    - 51 and 439
  3.    - 79 and 395
  4.    - 10 and 425
 Discuss Question
Answer: Option A. -> - 39 and 350
Question 145. Load cells are used for the measurement of
  1.    Stress
  2.    Weight
  3.    Strain
  4.    Velocity
 Discuss Question
Answer: Option B. -> Weight
Question 146. Thermistors are used in __________ devices.
  1.    Voltage measuring
  2.    Temperature measuring
  3.    Temperature compensating
  4.    Both B & C
 Discuss Question
Answer: Option D. -> Both B & C
Question 147. The amplitude ratio for the sinusoidal response of a __________ is 1.
  1.    First order system
  2.    Second order system
  3.    Transportation lag
  4.    None of these
 Discuss Question
Answer: Option C. -> Transportation lag
Question 148. The amplitude ratio for the sinusoidal response of __________ is < 1.
  1.    Transportation lag
  2.    First order system
  3.    Second order system
  4.    None of these
 Discuss Question
Answer: Option B. -> First order system
Question 149. __________ is undesirable in thermocouples used in industries,
  1.    Linear relation of emf to temperature
  2.    Corrosion resistance
  3.    Oxidation resistance
  4.    Non-linear relation of emf to temperature
 Discuss Question
Answer: Option D. -> Non-linear relation of emf to temperature
Question 150. Polarisation of light forms the working principle of a
  1.    Polarimeter
  2.    Polarograph
  3.    Chromatograph
  4.    Spectrometer
 Discuss Question
Answer: Option A. -> Polarimeter

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