Objective Questions on Operations of Heat Transfer
If you are appearing Hindustan Petroleum Corporation Limited Visakh Refinery Boiler Technician Recruitment exam 2020 and searching HPCL Boiler 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.
Which of the following is considered as opaque surface towards radiation?
(a) Gases
(b) Solids
(c) Liquids
(d) Both (b) and (c)
Black liquor generated during paper manufacture is concentrated in
(a) Single effect evaporator
(b) Single effect evaporator followed by crystalliser
(c) Multiple effect evaporator
(d) Multiple effect evaporator followed by a crystalliser
Steam consumption in kg/hr in case of evaporator is given by, if C= capacity of evaporator and E= Economy of evaporator
(a) C/E
(b) E/C
(c) CE
(d) 1/CE
For an ideal black body
(a) Absorptivity =1
(b) Reflectivity = 1
(c) Emissivity = 0
(d) Transmissivity =1
In case of vertical tube evaporator, with increase in liquor level, the overall heat transfer coefficient
(a) increases
(b) decreases
(c) is not affected
(d) may increases or decreases
The steam ject ejector is used to
(a) Remove condensate from the steam pipelines
(b) Create vacuum
(c) Superheat the steam
(d) None of these
The actual temperature drop across the heating surface in an evaporator depends on the
(a) Feed
(b) Depth of liquid over heating surface
(c) Pressure difference between steam chest and vapour space
(d) All of the above
Kirchoff’s law is applied to
(a) Total radiation
(b) Monochromatic radiations
(c) Both (a) and (b)
(d) Neither (a) nor (b)
In case of evaporation, liquid entrainment results primarily due to
(a) High vacuum in evaporator
(b) High evaporation rate
(c) Foaming of the solution
(d) High heat transfer rate
The number of kg vapourised per kg of steam fed to the evaporator is defined as
(a) Capacity of evaporator
(b) Rate of evaporation
(c) Economny of evaporator
(d) None of these
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