If you are appearing Hindustan Petroleum Corporation Limited Visakh Refinery Operations Technician Recruitment exam 2020 and searching HPCL Operatoins Technician Previous Year Paper/ Model Paper/ Sample Paper then you are at right place. Here, we are publishing Heat Transfer question paper for your practice.
Fourier”s law applies to the heat transfer by
(a) Convection
(b) Radiation
(c) Conduction
(d) All of the above
Fouoling factor
(a) is a dimensionless quantity
(b) does not provide a safety factor for design
(c) accounts for additional resistance to heat flow
(d) None of these
Thermal conductivity of a conducting solid material depends upon its
(a) Temperature
(b) Porosity
(c) Both (a) and (b)
(d) Neither (a) nor (b)
Which area is used in case of heat flow by conduction through a cylinder ?
(a) Logarithmic mean area
(b) Geometric mean area
(c) Arithmetic mean area
(d) None of these
For large heat transfer area requirement, shell and tube heat exchanger is preferred, because it
(a) occupies smaller space
(b) is more economical
(c) is easy to operate and maintain
(d) all of the above
In forced convention the heat transfer depends on
(a) Re, Pr
(b) Re, Gr
(c) Only Gr
(d) Only Re
Which increase in temperature, the thermal conductivity of most liquids
(a) increases
(b) decreases
(c) Remains same
(d) First increases then become constant
In a liquid-liquid heat exchanger, for the same process temperatures, the ratio of LMTD in parallel flow to the LMTD in counter flow is always
(a) <1
(b) >1
(c) 1
(d) Infinity
When warm and cold liquids are mixed, the heat transfer is mainly by
(a) conduction
(b) convection
(c) radiation
(d) both (a) & (c)
At what value of Prandtl Number, the thermal and hyrodynamic boundary layers are identical?
(a) 0.5
(b) 1
(c) 1.5
(d) 80
Natural convection is characterized by
(a) Grashoff’s Number
(b) Peclet Number
(c) Reynold Number
(d) Prandtl Number
1-2 heat exchangers means
(a) one tube pass and two shell passes
(b) one shell pass and two tube passes
(c) one shell pass and one tube pass
(d) None of these
Double pipe heat exchangers are preferred when
(a) overall heat transfer coefficient is low
(b) liquid is more viscous in nature
(c) low heat transfer area is required
(d) liquid is corrosive
In shell and tube heat exchangers, if tube surface is rough, heat transfer coefficient
(a) increases
(b) decreases
(c) Remain same
(d) None of these
Temperature variation in plain wall is
(a) Logarithmic
(b) Linear
(c) Parabolic
(d) None of these
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