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MCQs

Total Questions : 1634 | Page 130 of 164 pages
Question 1291. Thermocouple in a thermal well behaves as a true
  1.    Second order system (overdamped)
  2.    Multiple first order system
  3.    First order system
  4.    Second order system (underdamped)
 Discuss Question
Answer: Option B. -> Multiple first order system
Question 1292. Pyrometry refers to the measurement of temperature
  1.    Which is of higher magnitude
  2.    With the mercurial thermometer upto 350°C
  3.    All of these
  4.    Directly
 Discuss Question
Answer: Option A. -> Which is of higher magnitude
Question 1293. For measuring the temperature of a red hot furnace, which is the most suitable instrument?
  1.    Bimetallic thermometer
  2.    Platinum resistance thermometer
  3.    Thermocouple
  4.    Optical pyrometer
 Discuss Question
Answer: Option D. -> Optical pyrometer
Question 1294. Thermistors are made of
  1.    Nickel-chromium alloys
  2.    Ultra pure metals
  3.    Iron-copper alloys
  4.    Metal oxides
 Discuss Question
Answer: Option D. -> Metal oxides
Question 1295. What is the ratio of output amplitude to input amplitude for a sinusoidal forcing function in a first order system?
  1.    < 1
  2.    None of these
  3.    >1
  4.    1
 Discuss Question
Answer: Option A. -> < 1
Question 1296. For increased speed of response of an expansion pressure spring thermometer, the thermometer bulb should have a
  1.    High thermal conductivity
  2.    Small specific heat
  3.    All of these
  4.    Large area but small mass
 Discuss Question
Answer: Option C. -> All of these
Question 1297. Suppose that the gain, time constant and dead time of a process with the following transfer function:Gc(s) = 10 exp( - 0.1s)/(0.5s + 1) are known with a possible error of ± 20% of their values. The largest permissible gain Kc of a proportional controller needs to be calculated below taking the values of process gain, time constant and dead time as
  1.    12, 0.6, 0.12
  2.    12, 0.4, 0.08
  3.    8, 0.6, 0.08
  4.    8, 0.6, 0.12
 Discuss Question
Answer: Option A. -> 12, 0.6, 0.12
Question 1298. Optical activity of a solution can be determined using a
  1.    Dilatometer
  2.    Polarimeter
  3.    Refractrometer
  4.    Polarograph
 Discuss Question
Answer: Option B. -> Polarimeter
Question 1299. Time constant is the
  1.    Time required by the measured variable to reach 63.2% of its ultimate change
  2.    Same as dead time
  3.    Time taken by the controlled variable to reach 63.2% of its full change
  4.    Same as transportation lag
 Discuss Question
Answer: Option C. -> Time taken by the controlled variable to reach 63.2% of its full change
Question 1300. Working principle of radiation pyrometer is based on the
  1.    Stafan-Boltzman law
  2.    Kirchoffs law
  3.    Seebeck effect
  4.    Wien's law
 Discuss Question
Answer: Option A. -> Stafan-Boltzman law

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