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Process Control and Instrumentation

Process Control and Instrumentation
Meleoid gauge measures the __________ pressure.

Very high
Positive
Atmospheric
Sub-atmospheric

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Process Control and Instrumentation
Which of the following can not measure a temperature of 1600°C ?

Thermocouple
Radiation pyrometer
Platinum resistance thermometer
Photo-electric pyrometer

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Process Control and Instrumentation
Thermistor, which has high temperature co-efficient of resistivity, is used as the sensing element in resistance thermometer. It is a/an

Conductor
Insulator
Liquid semi-conductor
Solid semi-conductor

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Process Control and Instrumentation
The open loop transfer function of a control system is KR/(1 + TS) . This represents

A second order system
A first order time lag
A first order system
Dead time system

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Process Control and Instrumentation
Ordinary mercury in glass thermometer is used for measuring temperature upto 120°C. However, for measuring higher temperature upto __________ °C, thermometer is made by filling nitrogen under pressure above the mercury, which stops the evaporation of mercury and reduces the chance of broken thread of mercury.

350
250
550
700

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Process Control and Instrumentation
Nitrogen gas constant volume thermometer is suitable for measuring a temperature of __________ °C.

0-100
> 50
> 100
< 0

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