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Process Control and Instrumentation

Process Control and Instrumentation
The initial value (t=0) of the unit step response of the transfer function [(s + 1)/(2s + 1)] is

2
1
43832

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Process Control and Instrumentation
Pick out the one which is a first order instrument.

All of these
Bare metallic thermometer
Mercury in glass thermometer (without any covering or air gap)
Bare vapor pressure thermometer

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Process Control and Instrumentation
Strain gage uses an electrical conductor wire, which when elastically stretched increases in length and reduces in diameter. Both these dimensional changes result in __________ in the electrical resistance of the wire.

Increase
No change
Exponential decrease
Decrease

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Process Control and Instrumentation
A barometer measures the __________ pressure.

Dynamic
Absolute as well as gauge
Absolute
Gauge

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Process Control and Instrumentation
Cascade control means

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

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Process Control and Instrumentation
Emf developed by a thermocouple while measuring a temperature of 400°C is 22 mV. The type of thermocouple used is

Platinum-platinum+rhyodium
Platinum-rhodium
Iron-constantan
Chromel-alumel

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