Question Set 27

Question No. 1

In convection heat transfer, if heat flux intensity is doubled then temperature difference between solid surface and fluid will?


Get doubled.

Question No. 2

How you can define coal?


Coal is a naturally occurring hydrocarbon that consists of the fossilised remains of buried plant debris that have undergone progressive physical and chemical alteration, called coalification, in the course of geologic time.

Question No. 3

Why is the Suction pipe of Vapour Compression Refrigeration system insulated?


(A) It prevents the suction line from sweating and dripping water inside the house.

(B) The insulation also prevents the suction line attracting heat from the outdoors on its way to the condenser coil.

Question No. 4

How to determine the capacity of Refrigeration system? How we use Condenser coils, Compressor, Capillarity?


To determine the Refrigeration system by test of C.O.P and use the Condenser coils, Compressor, Capillarity, based on the properties

Question No. 5

What do you mean by super critical above 500 MW in Thermal power plant?


In super critical boiler means all the steam to convert in to superheated steam at outlet of boiler no need to sent to super heater once again.

Question No. 6

Which pollutant is major greenhouse gas and what is its effect?


CO is major greenhouse gas and it traps the radiation of heat from the sun within earth’s atmosphere.

Question No. 7

In order to increase efficiency and reduce CO emissions and other emissions, clear coal technologies are receiving major attention. What are these?


(A) Advanced pulverized and pressurized pulverized fuel combustion.

(B) Atmospheric fluidized bed combustion and pressurized fluidized bed combustion.

(C) Supercritical boilers.

(D) Integrated gasification combined cycle systems.

(E) Advanced integrated gasification, including fuel cell systems.

(F) Magneto hydrodynamic electricity generation.

Question No. 8

What does CC Stand for?


CC is the abbreviated form of cubic centimeter. It is the unit by which the capacity of an engine is designated. It is the volume between TDC and BDC. It represents the quantity of fuel-air mix or exhaust gas that is pumped out in a single piston stroke. Alternatively it can represent the volume of the cylinder itself.

Question No. 9

State the difference between ultimate and proximate analysis of coal?


In ultimate analysis, chemical determination of following elements is made by weight: Fixed and combined carbon, H, O, N, S, water and ash. Heating value is due to C, H and S.

In proximate analysis following constituents are mechanically determined by weight. Moisture, volatile matter, fixed carbon and ash heating value is due to fixed carbon and volatile matter.

Question No. 10

What is fuel ratio?


Fuel ratio is the ratio of its percentage (%) of fixed carbon to volatile matter.

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