A. Horizontal
B. Vertical
C. Inclined
D. Random
0
Which of the following is the most widely used heat insulating material for pipelines carrying steam ?
0
If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface temperature follows _____________ law?
A. Tar dolomite bricks followed by asbestos
B. Fireclay refractory followed by aluminium sheet
C. Cotton followed by aluminium foil
D. 85% magnesia cement and glass wool
0
Grashoff number is given by________________?
A. Parabolic
B. Hyperbolic
C. Linear
D. Logarithmic
0
In a heat exchanger, the rate of heat transfer from the hot fluid to the cold fluid___________________?
A. gD3.β.Δtρ2/μ2
B. gD2βΔtρ/μ2
C. gD2βΔtP2μ
D. gD3βΔtP2/μ
0
For what value of Prandtl number, St = f/2 ?
A. Varies directly as the area and the LMTD
B. Directly proportional to LMTD and inversely proportional to the area
C. Varies as square of the area
D. None of these
0
Heat sensitive materials can be concentrated in an evaporator employing_______________?
A. 1.5
B. 1
C. > 1
D. < 1
0
LMTD can’t be used as such without a correction factor for the_________________?
A. Vacuum
B. High pressure
C. High residence time
D. None of these
0
Conductance is given by (where, x = thickness, A = heat flow area, K = thermal conductivity.)?
A. Multipass heat exchanger
B. Baffled heat exchanger
C. Condensation of mixed vapour in a condenser
D. All A. B. and C.
0
Heat flux, as defined in heat flow is analogous to _______________ in electricity flow?
A. x/KA
B. KA/x
C. K/Ax
D. A/Kx
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