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Total Questions : 1634 | Page 19 of 164 pages
Question 181. Thermal wells used in temperature measurements should have
  1.    Very thick walls
  2.    Low emissivity
  3.    Polished surface
  4.    High transmissivity of radiation
 Discuss Question
Answer: Option D. -> High transmissivity of radiation
Question 182. Process degree of freedom indicates __________ number of controllers to be used.
  1.    The maximum
  2.    The minimum
  3.    Both maximum and the minimum
  4.    Nothing about the
 Discuss Question
Answer: Option A. -> The maximum
Question 183. Bimetal strips are not used in
  1.    Bimetallic thermometers
  2.    Thermocouples
  3.    Thermostats
  4.    Relays for opening & closing of electrical circuits
 Discuss Question
Answer: Option B. -> Thermocouples
Question 184. Bode diagram is a plot of
  1.    Log (AR) vs. log (f) and (Φ) vs. log (f)
  2.    Log (AR) vs. f and log Φ vs.f
  3.    AR vs. log (f) and Φ vs. log (f)
  4.    None of these
 Discuss Question
Answer: Option A. -> Log (AR) vs. log (f) and (Φ) vs. log (f)
Question 185. Bourdon tube is never made of
  1.    Phosphor bronze
  2.    Monel metal
  3.    Stainless steel
  4.    Cast iron
 Discuss Question
Answer: Option D. -> Cast iron
Question 186. Specific conductance is defined as the reciprocal of resistance in ohms of 1c.c. of liquid at a specified temperature. Its value for distilled water is about __________ micro mho/cm³.
  1.    50
  2.    100
  3.    10
  4.    1
 Discuss Question
Answer: Option D. -> 1
Question 187. Which of the following thermocouples is the most suitable for measuring a temperature of about 1600°C in an oxidizing atmosphere?
  1.    Platinum-platinum + rhodium
  2.    Iron-constantan
  3.    Copper-constantan
  4.    Chromel-alumel
 Discuss Question
Answer: Option A. -> Platinum-platinum + rhodium
Question 188. Small furnace draught is accurately measured by an inclined tube manometer, in which the manometric liquid used most commonly is
  1.    Water
  2.    Carbon tetrachloride
  3.    Paraffin
  4.    Ethylene glycol
 Discuss Question
Answer: Option C. -> Paraffin
Question 189. Which of the following is not a mechanical pressure sensing element?
  1.    Bellows
  2.    Diaphragm
  3.    Bourdon tube
  4.    U-tube
 Discuss Question
Answer: Option D. -> U-tube
Question 190. Cascade control means
  1.    Feed forward control
  2.    More than one feed-back loop
  3.    On-off control
  4.    One feed-back loop
 Discuss Question
Answer: Option B. -> More than one feed-back loop

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