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1) Working principle of mercury in glass thermometer is__________________? a. Volumetric expansion b. Pressure rise with temperature c. Linear expansion d. None of these
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2) Which of the following filled system expansion thermometers has the lowest positive temperature measurement capability ? a. Mercury in glass thermometer b. Alcohol in glass thermometer c. Fused metal (Na or K) in steel thermometer d. Nitrogen in steel thermometer
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3) The root locus plot of the roots of the characteristics equation of a closed loop system having the open loop transfer function K (s + 1)/[2 (2s + 1) (3s + 1)] will have a definite number of loci for variation of K from 0 to ∞. The number of loci is_______________? a. 1 b. 2 c. 3 d. 4
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4) Water is entering a storage tank at a temperature T0 and flow rate Q0 and leaving at a flow rate Q and temperature T. There are negligible heat losses in the tank. The area of cross-section of the tank is A0. The model that describes the dynamic variation of temperature of water in the tank with time is given as________________? a. Q0(T0 – T) = Ac . h (dT/dt) b. Q0T0 – QT = Ac . h (dT/dt) c. Q(T0 – T) = Ac . h (dT/dt) d. Q(T0 – T) = Ac . (dTH/dt)
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5) The transfer function for a P-D controller is________________? a. Kc(1+ηD s) b. Kc(1 +1/ηD s) c. Kc ηD s d. Kc/ηD s
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6) The time constant of a unity gain, first order plus time delay process is 5 min. If the phase lag at a frequency of 0.2 rad/min is 60°, then the dead time (in minutes) is________________? a. 5π/12 b. π/6 c. π/12 d. π/3
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7) Dead zone is the__________________? a. Same as time constant b. Same as transportation lag c. Maximum change in the variable that does not change the reading of the instrument d. None of these
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8) All the thermocouples used for temperature measurement use dissimilar metal ________________? a. Strips b. Bars c. Wires d. Beads
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9) A non-linear chemical system is exemplified by a/an_________________? a. Isothermal CSTR b. Mixer c. Non-isothermal CSTR d. None of these
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10) Continuous flue gas analyser makes use of paramagnetic properties of some of its constituents, which move towards the strongest part of the magnetic field thus displacing diamagnetic gases. Which of the following gases is diamagnetic ? a. CO2 b. O2 c. NO d. NO2
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11) Phase margin is equal to_______________? a. 180° – phase lag b. Phase lag – 180° c. Phase lag + 180° d. Phase lag + 90°
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12) For the time domain function f(t) = t, the Laplace transform of ∫0 t f(t) dt is given by___________________? a. 1/2 S3 b. 2/S3 c. 1/S3 d. 2/S2
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13) Thermocouple is suitable for measuring_________________? a. Liquid temperatures only b. Very high temperatures only c. Very low temperatures only d. Both high and low temperatures
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14) The frequency at which maximum amplitude ratio is attained is called the ______________ frequency? a. Corner b. Resonant c. Cross-over d. Natural
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15) The time taken for a radioactive element to reduce to 50% of its original weight is _____________ years, if its half life period is 12 years? a. 24 b. 18 c. 6 d. 36
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16) Pick out the wrong statement? a. There is no transfer lag for a single first order system b. Stirred tank with a water jacket exemplifies an interacting system c. Transfer lag is a characteristic of all higher order systems (other than first order systems) d. Transfer lag decreases as the number of stages decreases
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17) Pick out the wrong statement ? a. Proportional controller is normally used for level control in industrial applications b. CSTR can be considered as a distributed parameter system c. Distributed parameter approach gives partial differential equation d. Non-linear behaviour is exemplified by an on-off controller
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18) Select the correct statement from the following? a. The frequency response of a pure capacity process is unbounded b. The phase lag of a pure time delay system decreases with increasing frequency c. The amplitude ratio of a pure capacity process is inversely proportional to frequency d. The amplitude ratio of a pure time delay system increases with frequency
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19) Pick out the first order system from among the following ? a. Damped vibrator b. Mercury in glass thermometer kept in boiling water c. Interacting system of two tanks in series d. Non-interacting system of two tanks in series
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20) 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.
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