A. Cooling produces tension on the surface
B. Cooling produces compression on the surface
C. Heating does not produces any thermal stress
D. Heating produces compression on the surface
✅ The correct answer is option A.
Engineering
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1232. Paint spray gun works on the principle of
A. Bernoulli’s theorem
B. Boyle’s law
C. Newton’s law of viscosity
D. None of these
✅ The correct answer is option A.
1233. The thermal radiative flux from a surface of emissivity = 0.4 is 22.68 kW/m². The approximate surface temperature (K) is (Stefan-Boltzman constant = 5.67xl0⁻⁸ W/m².K⁴)
1000
727
800
1200
✅ The correct answer is option A.
1234. Heat transfer by radiation between two bodies at T₁ & T₂ and in an ambient temperature of Ta°C depends on
T₁ – T₂
T₁ – Ta
T₂ – Ta
None of these
✅ The correct answer is option D.
1235. In case of a multipass shell and tube heat exchanger, the temperature drop in the fluid
Is inversely proportional to the resistance across which the drop occurs
And the wall are proportional to individual resistances
And the wall is not related
None of these
✅ The correct answer is option B.
1236. In a 1-1 cocurrent heat exchanger, if the tube side fluid outlet temperature is equal to the shell side fluid outlet temperature, then the LMTD is
∞
0
Equal to the difference between hot and cold fluids inlet temperature
Equal to the difference between hot fluid inlet temperature and cold fluid outlet temperature
✅ The correct answer is option B.
1237. h.D/K is called the __________ number.
Nusselt
Peclet
Rayleigh
Grashoff
✅ The correct answer is option A.
1238. For the same heat transfer area and the terminal conditions, the ratio of the capacities of a single effect evaporator to a triple effect evaporator is
3
0.33
1
1.33
✅ The correct answer is option C.
1239. With increase in temperature, the thermal conductivity of non-metallic amorphous solids
Decreases
Increases
Remains constant
First decreases upto certain temperature and then increases
✅ The correct answer is option B.
1240. In a shell and tube heat exchanger, the height of 25 percent cut baffles is equal to (where, D = inside diameter of shell)
0.25 D
0.75 D
0.50 D
None of these
✅ The correct answer is option B.