Chemical Engineering - Chemical Engineering Basics

46. 

On-off control

A. fully opens the final control element, when the measured variable is below the set point.
B. fully closes the final control element, when the measured variable is above the set point.
C. is a two position control (fully open or fully closed) control adequate to control a process with slow reaction and minimum dead time or transfer lag.
D. none of these.

Answer: Option C

Explanation:

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47. 

The tensile load-elongation curve of a metal does not describe

A. work hardening
B. yield stress
C. anisotropy index
D. necking strain

Answer: Option C

Explanation:

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48. 

Usual value of the resistance suitable for a wire resistance strain gauge is __________ ohms.

A. 20
B. 80
C. 120
D. 500

Answer: Option C

Explanation:

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49. 

Permanent set in a material is produced by subjecting it to

A. triaxial loading.
B. fatigue loading.
C. stresses beyond the elastic limit.
D. tensile & compressive loads simultaneously.

Answer: Option C

Explanation:

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50. 

The following is a typical anionic collector used in flotation.

A. Ethyl dixanthogen.
B. Trimethyl cetyl ammonium bromide.
C. Potassium ethyl xanthate.
D. lAuryl amine hydrochloride.

Answer: Option C

Explanation:

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