41
Intermittant tube cleaning is possible to be done in case of a __________ evaporator.
A)
Basket type
B)
Horizontal tube
C)
Calendria
D)
None of these
Answer & Solution
Answer: Option
A
42
Steam is routed through the tube in case of a __________ evaporator.
A)
Basket type
B)
Horizontal tube
C)
Short tube vertical
D)
Long tube vertical
Answer & Solution
Answer: Option
B
43
In a shell and tube heat exchanger,
A)
The temperature drops in the two fluids and the wall are proportional to individual resistances
B)
The temperature drop is inversely proportional to the resistance across which the drop occurs
C)
There is no relationship between temperature drop and resistance
D)
The relationship is not generalised
Answer & Solution
Answer: Option
A
44
Which of the following parameters of the fluid is not very important, while deciding its route in a shell and tube heat exchanger?
A)
Corrosiveness & fouling characteristics
B)
Pressure
C)
Viscosity
D)
Density
Answer & Solution
Answer: Option
D
45
Pick out the wrong statement.
A)
'Solvates' are chemical compounds formed by solute with their solvents. When water is the solvent, then it is called a 'hydrate'
B)
In heat exchanger calculations (Δt)weighted is used in place of Δt, when it involves more than one sequence of heating or cooling i.e., desuperheating & condensation or condensation & sub-cooling
C)
Heat transfer co-efficient during nucleate boiling is not influenced by the agitation imparted
D)
In case of short tube vertical evaporators, area of central downtake is about 50 to 100% of the total tube cross-sectional area
Answer & Solution
Answer: Option
C
46
Open pan evaporators are preferred to be used, when the solution to be concentrated is
A)
Scaling
B)
Highly viscous
C)
Corrosive
D)
Salty
Answer & Solution
Answer: Option
B
47
In thermal radiation for a black body (where, ε is emissivity and α is absorptivity)
A)
α = 1; ε ≠ 1
B)
α ≠ 1, ε = 1
C)
α ≠ 1, ε ≠ 1
D)
α = 1; ε = 1
Answer & Solution
Answer: Option
D
48
Out of 100 kcal/second of incident radiant energy on the surface of a thermally transparent body, 300 kcal/second is reflected back. If the transmissivity of the body is 0.25, the emissivity of the surface will be
A)
0.35
B)
0.45
C)
0.55
D)
0.85
Answer & Solution
Answer: Option
B
49
For shell and tube heat exchanger, with increasing heat transfer area, the purchased cost per unit heat transfer area
A)
Increases
B)
Decreases
C)
Remains constant
D)
Passes through a maxima
Answer & Solution
Answer: Option
D
A)
Condense the steam flowing in the pipeline
B)
Remove water resulting from partial condensation of steam
C)
Stop the supply of steam
D)
None of these
Answer & Solution
Answer: Option
B
