A.None of these
B.Quartz
C.Tridymite
D.Cristobalite
Explanation: The correct answer is Tridymite.
Submitted by: Academy of Pakistan
Chemical Engineering MCQs: 8,342 practice questions with answer choices and available explanations. Page 177 of 557.
Chemical Engineering MCQs
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A.Its vapor pressure at the condenser temperature should be very high
B.It should be non-explosive
C.None of these
D.It should have a sub-atmospheric vapor pressure at the temperature in refrigerator coils
Explanation: The correct answer is It should have a sub-atmospheric vapor pressure at the temperature in refrigerator coils.
Submitted by: Academy of Pakistan
A.D, A, B, C
B.A, C, B, D
C.D, B, C, A
D.D, C, B, A
Explanation: The correct answer is D, B, C, A.
Submitted by: Academy of Pakistan
A.Gravity separation
B.Particle shape
C.None of these
D.Wettability
Explanation: The correct answer is Gravity separation.
Submitted by: Academy of Pakistan
A.Momentum diffusivity to thermal diffusivity
B.Mass diffusivity to thermal diffusivity
C.Thermal diffusivity to mass diffusivity
D.Thermal diffusivity to momentum diffusivity
Explanation: The correct answer is Momentum diffusivity to thermal diffusivity.
Submitted by: Academy of Pakistan
A.Directly proportional to
B.Independent of
C.Inversely proportional to
D.Proportional to the square of
Explanation: The correct answer is Independent of.
Submitted by: Academy of Pakistan
A.D/2 and 2 D
B.D/4 and 2 D
C.D and 2 D
D.D/5 and D
Explanation: The correct answer is D/5 and D.
Submitted by: Academy of Pakistan
A.Recovery of product will be difficult
B.None of these
C.Uniformity of product cannot be achieved
D.Contamination of pure culture would result
Explanation: The correct answer is Contamination of pure culture would result.
Submitted by: Academy of Pakistan
A.Carbon dioxide
B.Ammonia
C.Freon-12
D.Ethylene
Explanation: The correct answer is Ethylene.
Submitted by: Academy of Pakistan
A.Higher tensile strength
B.Lower density
C.None of these
D.Higher melting point
Explanation: The correct answer is Lower density.
Submitted by: Academy of Pakistan
A.Is always negative
B.Is always positive
C.Can’t be known without calculating it
D.Is equal to the heat of formation
Explanation: The correct answer is Is always negative.
Submitted by: Academy of Pakistan
A.One of the liquid components is heat sensitive
B.Extracting solvent is cheaply & abundantly available
C.One of the liquid components has very high affinity towards the solvent
D.Viscosity of liquid components is very high
Explanation: The correct answer is One of the liquid components has very high affinity towards the solvent.
Submitted by: Academy of Pakistan
A.None of these
B.Tridymite
C.Quartz
D.Cristobalite
Explanation: The correct answer is Cristobalite.
Submitted by: Academy of Pakistan
A.Carbon refractories cannot be used in the furnaces operating under reducing conditions
B.Silica occurs in nature in all cellular, amorphous or crystalline form
C.Mullite can be obtained by the heating of alusite, kyanite or sillimanite
D.Sand & coke is the main raw material for the manufacture of silicon carbide
Explanation: The correct answer is Carbon refractories cannot be used in the furnaces operating under reducing conditions.
Submitted by: Academy of Pakistan
A.Tin
B.High silicon iron (14% Si)
C.Stainless steel
D.All A., B. and C.
Explanation: The correct answer is All A., B. and C..
Submitted by: Academy of Pakistan