Practice Test: Question Set - 17
1. Paramagnetism method is not used for the composition determination of _________ in gases.
- (A) Oxygen
- (B) Oxides of nitrogen
- (C) Carbon dioxide
- (D) Any of these
2. ________ is undesirable in thermocouples used in industries,
- (A) Linear relation of emf to temperature
- (B) Corrosion resistance
- (C) Oxidation resistance
- (D) Non-linear relation of emf to temperature
3. Mercury manometer (U-tube type) exemplifies a _________ order system.
- (A) Zero
- (B) First
- (C) Second
- (D) Third
4. Small furnace draught is accurately measured by an inclined tube manometer, in which the manometric liquid used most commonly is
- (A) Water
- (B) Carbon tetrachloride
- (C) Paraffin
- (D) Ethylene glycol
5. Liquid argon level in a pressurized storage tank (at 3 kg/cm2) is measured by a/an
- (A) Gage glass
- (B) External float gage
- (C) Differential pressure gage
- (D) None of these
6. Which of the following relates the absorption & evolution of heat at the junctions of a thermocouple to the current flow in the circuit?
- (A) Seebeck effect
- (B) Peltier effect
- (C) Joule heating effect
- (D) Thomson effect
7. E.m.f. generated by thermocouples is of the order of
- (A) Milli volts
- (B) Micro volts
- (C) Volts
- (D) Kilo volts
8. The term analogous to the electrical current in a thermal system is the
- (A) Temperature difference
- (B) Heat flow rate
- (C) Heat content in the system
- (D) None of these
9. Pick out the one which is a first order instrument.
- (A) Mercury in glass thermometer (without any covering or air gap)
- (B) Bare metallic thermometer
- (C) Bare vapor pressure thermometer
- (D) All (a), (b) and (c)
10. The open loop transfer function of a control system is KR/(1 + TS). This represents
- (A) A first order system
- (B) Dead time system
- (C) A first order time lag
- (D) A second order system
11. The frequency response of a dynamic element shows a constant magnitude ratio at all frequencies. The element exhibits a negative phase shift at all frequencies. The absolute value of the phase shift increases linearly with frequency. The element has the transfer function
- (A) e-τS
- (B) (T1S + 1)/(T2S + 1)
- (C) (T1S/(T2S + 1)
- (D) (T1S + 1)/(T2S)
12. Dilute wine was used as a thermometric liquid initially to develop temperature scale. First empirical temperature scale developed was the _________ scale.
- (A) Kelvin
- (B) Centigrade
- (C) Fahrenheit
- (D) Reaumer
13. 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
- (A) 8, 0.6, 0.08
- (B) 12, 0.6, 0.12
- (C) 8, 0.6, 0.12
- (D) 12, 0.4, 0.08
14. ________ are analyzed using a Polarograph.
- (A) Isotonic solutions
- (B) Solids
- (C) Liquids
- (D) Gases
15. Transfer function of transportation lag is
- (A) eTS
- (B) e-TS
- (C) 1/(Ts + 1)
- (D) None of these
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