Process Control and Instrumentation

161. Radiation pyrometers as compared to thermocouples

1. Has a slower speed of response
2. Can measure higher temperature
3. Can’t measure the temperature of moving objects
4. Is more affected by corrosive atmosphere

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162. Radiation thermometer cannot measure the temperature

1. Inside a pressure vessel
2. Of an object without coming in contact with it
3. Of liquid oxygen
4. Of moving objects at high temperature

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163. Range of hydrogen gas constant volume thermometer is _________ °C.

1. -10 to 20
2. 0 to 100
3. 100 - 500
4. 400 - 1000

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164. Reference points i.e., ice point and steam point in Reaumer temperature scale are respectively

1. - 273° & 80°
2. 0° & 80°
3. 32° & 460°
4. 32° & 80°

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165. Relationship between absorption/evolution of heat at the thermocouple junctions and the current flow in the circuit is given by _________ effect.

1. Peltier
2. Thomson
3. Seebeck
4. None of these

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166. Reset rate is the another term used for _________ time.

1. Dead
2. Integral
3. Derivative
4. None of these

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167. Resistance of a gas in a vessel is given by (where, P = pressure, V = volume of the vessel, n = no. of moles of the gas, R = gas constant)

1. V/nRT
2. nRT/V
3. nRT/P
4. P/nRT

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168. Response of a linear control system for a change in set point is called

1. Frequency response
2. Transient response
3. Servo problem
4. Regulator problem

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169. Response of a system to a sinusoidal input is called _________ response.

1. Impulse
2. Unit step
3. Frequency
4. None of these

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170. Routh stability method uses _________ loop transfer function.

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

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