The value of Prandtl number for air is about _______________________?
The value of Prandtl number for air is about _______________________?
A. 0.1
B. 0.3
C. 0.7
D. 1.7
E. 10.5
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In forced circulation, the heating element is injected
Question: In forced circulation, the heating element is injected
[A].internally [B].
externally [C].
both (a) and (a) [D].
neither (a) nor (b) Answer: Option A
Explanation:
No answer description available for this question.
Environmental protection agencies advice against the use of chloro-fluoro-carbon refrigerants since
Question: Environmental protection agencies advice against the use of chloro-fluoro-carbon refrigerants since
[A].these react with water vapour and cause acid rain [B].
these react with plants and cause green-house effect [C].
these react with oxygen and cause its depletion [D].
these react with ozone layer Answer: Option D
Explanation:
No answer description available for this question.
Which of the following refrigerant has the maximum ozone depletion potential in the stratophere?
Question: Which of the following refrigerant has the maximum ozone depletion potential in the stratophere?
[A].Ammonia [B].
Carbon dioxide [C].
Sulphur dioxide [D].
Flourine Answer: Option D
Explanation:
No answer description available for this question.
In a single evaporator system, the steam economy __________ by creating vacuum in the evaporator.
Question: In a single evaporator system, the steam economy __________ by creating vacuum in the evaporator.
[A].increases [B].
decreases [C].
remains constant [D].
may increase or decrease, depends on the vacuum Answer: Option A
Explanation:
No answer description available for this question.
Grashoff number, which is defined as g . β(Ts – T∞) ρ2. L3/μ2, is proportional to the ratio of buoyancy force to __________ force.
Question: Grashoff number, which is defined as g . β(Ts – T∞) ρ2. L3/μ2, is proportional to the ratio of buoyancy force to __________ force.
[A].viscous [B].
elastic [C].
inertial [D].
none of these Answer: Option A
Explanation:
No answer description available for this question.
Thermal diffusivity of a substance is ____________________?
Thermal diffusivity of a substance is ____________________?A. proportional of thermal conductivity
B. inversely proportional to k
C. proportional to (k)
D. inversely proportional to k2
E. none of the above