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Process Control and Instrumentation

Process Control and Instrumentation
Which of the following controllers has maximum offset?

P-I-D controller
P-I controller
P-controller
P-D controller

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Process Control and Instrumentation
Cascade control means

Feed forward control
On-off control
More than one feed-back loop
One feed-back loop

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Process Control and Instrumentation
Compositional analysis of __________ is done using mass spectrometer.

An alloy
An isotope
Natural gas
A solid

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Process Control and Instrumentation
Emf developed by a thermocouple, while measuring a temperature of 600°C is about 5.5 mV. The type of thermocouple used is

Chromel-alumel
Iron-constantan
Either A, B or C
Platinum-platinum+rhodium

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Process Control and Instrumentation
Mercury thermometer is commonly used for low temperature measruement. The freezing point and boiling point of mercury are respectively __________ °C.

- 51 and 439
- 39 and 350
- 10 and 425
- 79 and 395

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Process Control and Instrumentation
Temperature of __________ can not be measured by an optical or radiation pyrometer.

Molten slag flowing out of blast furnace
Rotary limestone calcination kiln
Combustion space in boilers
Hot blast (air) from stoves

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