Question: A __________ evaporator employs an annular downtake.
[A].basket type
horizontal
long tube vertical
none of these
[A].
[B].
[C].
[D].
Answer: Option A
Explanation:
No answer description available for this question.
Heat Transfer
A hollow sphere and a solid sphere of the same material and equal radii are heated to the same temperature. In this case,
Question: A hollow sphere and a solid sphere of the same material and equal radii are heated to the same temperature. In this case,
[A].the cooling rate will be the same for the two spheres and hence the two spheres will have equal temperatures at any instant.
both the spheres will emit equal amount of radiation per unit time in the beginning.
both will absorb equal amount of radiation from the surrounding in the beginning.
both(b) & (c).
[A].
[B].
[C].
[D].
Answer: Option D
Explanation:
No answer description available for this question.
A black body does not __________ radiation.
Question: A black body does not __________ radiation.
[A].absorb or emit
refract
reflect
both(b) & (c)
[A].
[B].
[C].
[D].
Answer: Option D
Explanation:
No answer description available for this question.
A body cools down from 75°C to 70°C in 10 minutes. It will cool down from 70° C to 65° C in __________ minutes.
Question: A body cools down from 75°C to 70°C in 10 minutes. It will cool down from 70° C to 65° C in __________ minutes.
[A].10
>10
<10
either (b) or (c), depends on the mass of the body
[A].
[B].
[C].
[D].
Answer: Option B
Explanation:
No answer description available for this question.
A hot liquid is kept in a big room. The logorithm of the numerical value of the temperature difference between the liquid and the room is plotted against time. The plot will be very nearly a/an
Question: A hot liquid is kept in a big room. The logorithm of the numerical value of the temperature difference between the liquid and the room is plotted against time. The plot will be very nearly a/an
[A].ellipse
straight line
parabola
circular arc
[A].
[B].
[C].
[D].
Answer: Option B
Explanation:
No answer description available for this question.
In a parallel flow heat exchanger, if the outlet temperature of hot and cold fluids are the same, then the log mean temperature difference (LMTD) is
Question: In a parallel flow heat exchanger, if the outlet temperature of hot and cold fluids are the same, then the log mean temperature difference (LMTD) is
[A].minimum
maximum
zero
infinity
[A].
[B].
[C].
[D].
Answer: Option C
Explanation:
No answer description available for this question.
In case of surface condensers, a straight line is obtained on plotting __________ on an ordinary graph paper.
Question: In case of surface condensers, a straight line is obtained on plotting __________ on an ordinary graph paper.
[A].1/-0.8
-0.8
-2
1/-2
[A].
[B].
[C].
[D].
Answer: Option A
Explanation:
No answer description available for this question.
Harmonic mean temperature difference is given by
Question: Harmonic mean temperature difference is given by
[A].ΔT1. ΔT2
[A].
[B].
[C].
[D].
Answer: Option B
Explanation:
No answer description available for this question.
Heat transfer efficiency leading of energy conservation in a heat exchanger can be achieved by
Question: Heat transfer efficiency leading of energy conservation in a heat exchanger can be achieved by
[A].keeping the heat transfer surface clean.
enhancing the fluid pumping rate.
increasing the tube length.
none of these.
[A].
[B].
[C].
[D].
Answer: Option A
Explanation:
No answer description available for this question.
Heat transfer co-efficient (h) for a fluid flowing inside a clean pipe is given by This is valid for the value of NRe equal to
Question: Heat transfer co-efficient (h) for a fluid flowing inside a clean pipe is given by This is valid for the value of NRe equal to
[A].< 2100
2100-4000
> 4000
> 10000
[A].
[B].
[C].
[D].
Answer: Option D
Explanation:
No answer description available for this question.