Chemical Engineering Basics - Study Mode

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[#546] Water hammer in pipelines results, when the flowing fluid

(A) Has very high velocity

(B) Has very high pressure

(C) Is brought to rest by gradually closing a valve

(D) Is suddenly brought to rest by closing a valve

Correct Answer

(D) Is suddenly brought to rest by closing a valve

[#547] Which of the following is capable of acting both as an acid flux as well as a basic flux in the metal extraction from its ore?

(A) Silica

(B) Lime

(C) Alumina

(D) Fluorite

Correct Answer

(C) Alumina

[#548] The heat released by cooling one mole of copper from 400 K to room temperature (300 K) is (assume : C p of copper is 23 J.K -1 mole -1 )

(A) 2300 J

(B) 4600 J

(C) 230 J

(D) 2.3 × 10 6 J

Correct Answer

(A) 2300 J

[#549] While the recrystallisation temperature for pure metals is 0.3 T m , the same for alloys is equal to __________ × T m (where, T m Melting temperature).

(A) 0.25

(B) 0.45

(C) 0.70

(D) 0.95

Correct Answer

(C) 0.70

[#550] What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer co-efficient with the ambient atmosphere is 5 W/m 2 .°K? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m.°K respectively.

(A) 2

(B) 5

(C) 10

(D) 20

Correct Answer

(A) 2