Practice Test: Question Set - 20
1. Emf developed by a thermocouple, while measuring a temperature of 600°C is about 5.5 mV. The type of thermocouple used is
- (A) Chromel-alumel
- (B) Iron-constantan
- (C) Platinum-platinum + rhodium
- (D) Either (a), (b) or (c)
2. _________ is the static characteristics of an instrument.
- (A) Response
- (B) Tine lag
- (C) Drift
- (D) Dynamic error
3. Pressure of 0.0001 absolute psi can be measured by _________ gauge.
- (A) Mcleod
- (B) Pirani
- (C) Thermocouple
- (D) None of these
4. Pick out the wrong statement.
- (A) O2, NO and NO2 exhibit
paramagnetic properties as a result of unpaired electrons
- (B) CO2 is the strongest paramagnetic gas
- (C) Paramagnetic susceptibility of gases decreases with temperature
- (D) Paramagnetic susceptibility of gases permits the
measurement of their concentration
5. Process degree of freedom indicates __________ number of controllers to be used.
- (A) The maximum
- (B) The minimum
- (C) Both maximum and the minimum
- (D) Nothing about the
6. The unit step response of the transfer function (2s - 1)/[(3s + 1) (4s + 1)] reaches its final steady state asymptotically after
- (A) A monotonic increase
- (B) A monotonic decrease
- (C) Initially increasing and then decreasing
- (D) Increasing decreasing and then increasing
7. Thermal conductivity measurement com-prises the working principle of a
- (A) CO2 analyzer
- (B) Polarimeter
- (C) Spectrometer
- (D) Chromatograph
8. Thermal wells used in temperature measurements should have
- (A) Very thick walls
- (B) Low emissivity
- (C) Polished surface
- (D) High transmissivity of radiation
9. Which of the following is a 'contact' pyrometer?
- (A) Resistance pyrometer
- (B) Optical pyrometer
- (C) Radiation pyrometer
- (D) Infra red pyrometer
10. A proportional controller with a gain of Kc is used to control a first order process. The offset will increase, if
- (A) Kc is reduced
- (B) Kc is increased
- (C) Integral control action is introduced
- (D) Derivative control action is introduced
11. Which of the following is not a second order instrument?
- (A) Mercury in glass thermometer with covering
- (B) Bare mercury in glass thermometer
- (C) Pressure gauge with one bellow, two tubes and a tank
- (D) None of these
12. On-off controllers are normally used for
- (A) Low loads
- (B) Temperature changes
- (C) Flow rate changes
- (D) None of these
13. The _________ of a vapor pressure thermometer is a functioning element.
- (A) Pointer
- (B) Bourdon tube
- (C) Bulb
- (D) None of these
14. A pyrheliometer is an instrument used for measuring the
- (A) Bright sunshine period
- (B) Beam radiation
- (C) Diffuse radiation
- (D) None of these
15. Pirani gauge is used for the measurement of
- (A) Very high pressure
- (B) High vacuum
- (C) Liquid level under pressure
- (D) Liquid level at atmospheric pressure
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