Process Control and Instrumentation

41. Bode stability method uses _________ loop transfer function.

1. Open
2. Closed
3. Either (A) or (B)
4. Neither (A) nor (B)

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42. Bourdon gauges are used for measuring pressure (kg/cm²)

1. < atmospheric
2. < 2 (gauge)
3. < 2 (gauge)
4. < 10 (absolute)

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43. Bourdon tube is never made of

1. Phosphor bronze
2. Monel metal
3. Stainless steel
4. Cast iron

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44. Cascade control means

1. Feed forward control
2. More than one feed-back loop
3. On-off control
4. One feed-back loop

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45. Change of angle of refraction with composition comprises the working principle of a

1. Polarimeter
2. Polarograph
3. Spectrometer
4. Refractometer

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46. Characteristic equation is the denominator of _________ loop transfer function.

1. Open
2. Closed
3. Both (A) and (B)
4. Neither (A) nor (B)

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47. Composition of alloys can be determined by

1. Polarograph
2. Chromatograph
3. Refractometer
4. None of these

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48. Composition of natural gas is determined by the

1. Haldane apparatus
2. Mass spectrometer
3. Chromatograph
4. Both (B) and (C)

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49. Compositional analysis of _________ is done using mass spectrometer.

1. An isotope
2. Natural gas
3. A solid
4. An alloy

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50. Compositional analysis of flue gas coming out of a furnace in respect of O₂ and CO₂% can be continuously done by a/an

1. Orsat apparatus
2. Thermal conductivity cell
3. Zirconia probe
4. Chromatograph

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