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.Management Sciences
Category: Process Control and Instrumentation
Use of I-control along with P-control facilitates ?
A. Elimination of offset
B. Reduction of offset
C. Reduction of stability time
D. None of these
The time constant of a first order process with resistance R and capacitance C is__________________?
A. R + C
B. R – C
C. RC
D. 1/RC
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
Mercury thermometer is commonly used for low temperature measurement. The freezing point and boiling point of mercury are respectively _____________ °C?
A. – 39 and 350
B. – 51 and 439
C. – 79 and 395
D. – 10 and 425
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
Flow rate of those fluids which are insensitive to changes in their density, viscosity or flow velocity profile can be best measured by a ________________?
A. Magnetic flowmeter
B. Pitot tube
C. Flow nozzle type flowmeter
D. Turbine flowmeter
In a shell and tube heat exchanger, the flow rate of heating/cooling fluid is the ______________ variable?
A. Load
B. Controlled
C. Manipulated
D. None of these
Compositional analysis of ______________ is done using mass spectrometer?
A. An isotope
B. Natural gas
C. A solid
D. An alloy
A barometer measures the _____________ pressure?
A. Absolute
B. Gauge
C. Absolute as well as gauge
D. dynamic
Polarisation of light forms the working principle of a______________?
A. Polarimeter
B. Polarograph
C. Chromatograph
D. Spectrometer
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