Process Control and Instrumentation

Phase lag of the frequency response of a second order system to a sinusoidal forcing function______________?

Byadmin March 5, 2019August 24, 2021

Phase lag of the frequency response of a second order system to a sinusoidal forcing function______________?

A. Is 30°
B. Is 90° at the most
C. Approaches 180° asymptotically
D. Is 120°

Process Control and Instrumentation

Thermal conductivity cell is the primary element of a/an _____________ analyser?

Thermal conductivity cell is the primary element of a/an _____________ analyser?

A. Oxygen
B. Carbon dioxide
C. Carbon monoxide
D. Sulphur dioxide

Read More Thermal conductivity cell is the primary element of a/an _____________ analyser?
Process Control and Instrumentation

Measurement of pressure in ammonia reactor is done by __________________?

Measurement of pressure in ammonia reactor is done by __________________?

A. Bourdon gauge
B. U-tube manometer
C. Inclined tube manometer
D. Pirani gauge

Read More Measurement of pressure in ammonia reactor is done by __________________?
Process Control and Instrumentation

Zirconia probe is used for the measurement of___________________?

Zirconia probe is used for the measurement of___________________?

A. Humidity of air
B. % CO2 in flue gas
C. % O2 in flue gas
D. Speed of a submarine

Read More Zirconia probe is used for the measurement of___________________?
Process Control and Instrumentation

Thermistors are made of__________________?

Thermistors are made of__________________?

A. Ultra pure metals
B. Metal oxides
C. Iron-copper alloys
D. Nickel-chromium alloys

Read More Thermistors are made of__________________?
Process Control and Instrumentation

In a feed-back control system G and H denote open loop and close loop transfer functions respectively. The output-input relationship is_____________?

In a feed-back control system G and H denote open loop and close loop transfer functions respectively. The output-input relationship is_____________?

A. G/(1 + H)
B. H/(1 + G)
C. G/H
D. H/G

Read More In a feed-back control system G and H denote open loop and close loop transfer functions respectively. The output-input relationship is_____________?
Process Control and Instrumentation

“A control system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at the crossover frequency.” This is _______________ criterion?

“A control system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at the crossover frequency.” This is _______________ criterion?

A. Bode stability
B. Nyquist
C. Routh stability
D. None of these

Read More “A control system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at the crossover frequency.” This is _______________ criterion?

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