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Home » Engineering » Chemical Engineering » Aptitude Test - 29
1.In a muffle furnace, the muffle___?
A. Retards the heat transfer
B. Assists in temperature equalisation in the charge
C. Permits the use of controlled atmosphere for the protection of stock
D. Retards the heat transfer
2.Regenerators are used for waste heat recovery in___?
A. By-product coke ovens
B. Beehive coke oven
C. Blast furnace stoves
D. By-product coke ovens
3.Ceramic recuperators (made of SiC) is economical, only when used for preheating combustion air above ____ �C?
A. 250
B. 650
C. 850
D. 250
4.Air filtration in a furnace______?
A. Reduces its thermal efficiency
B. Is indicated by flame sting out
C. Increases the flue gas temperature
D. Reduces its thermal efficiency
5.Which of the following is not a directly fired furnace ?
A. By-product coke oven
B. Calcination kiln
C. Sintering furnace
D. By-product coke oven
6.Thermal efficiency of an open hearth furnace may be about ______ percent?
A. 5
B. 20
C. 50
D. 5
7.The electric furnace in which heat is produced by a combination of induced current and skin effect is called _____ furnace?
A. Arc
B. Resistance
C. Low frequency induction
D. Arc
8.Which of the following is the most suitable for preheating combustion air above 650�C ?
A. Regenerator
B. Metallic recuperator
C. Ceramic recuperator
D. Regenerator
9.Artificial draught produced by a fan in the furnace can be controlled by the___?
A. Speed of the fan
B. Damper
C. Variation in the pitch of fan blades
D. Speed of the fan
10.Protective gas used in the annealing furnace for steel coil comprises of___?
A. 95% N2 + 5% H2
B. 5% H2 + 9% N2
C. 100% CO
D. 95% N2 + 5% H2
11.Acid dew point temperature (ADT) of a flue gas produced by the combustion of a fuel containing 1% sulphur may be about ______ �C?
A. 80
B. 130
C. 180
D. 80
12.Reheating furnace (pusher type) is used for heating____?
A. Ingots
B. Slabs
C. Steel coils
D. Ingots
13.Which of the following variables affects the furnace capacity ?
A. Temperature of flue gas
B. Thermal conductivity of stock
C. Thickness of heating stock
D. Temperature of flue gas
14.Scaling of furnace stock is reduced by ______ in flue gas?
A. CO
B. H2
C. High CO/CO2
D. CO
15.An improved and fuel efficient version of the pusher type reheating furnace is the ____ furnace?
A. Walking beam
B. Shaft
C. Tunnel
D. Walking beam
16.Forced recirculation of furnace gases is practised___?
A. To increase heat transfer by convection
B. To ensure uniform temperature
C. In furnaces, operating below 750�C
D. To increase heat transfer by convection
17.In a furnace, the heat taken by the charge/stock and the heat lost to the furnace structure & flue gases depends on the___?
A. Rate of firing and emissivity of flame
B. Nature of process; whether batch, continuous or intermittent
C. Thermal conductivity of the charge & structural materials of furnace
D. Rate of firing and emissivity of flame
18.Flue gas outlet temperature from the chimney of any furnace should be ideally about _____ �C?
A. 50
B. 100
C. 150
D. 50
19.Which of the following is a batch furnace ?
A. Cupola
B. Reheating furnace
C. Glass tank furnace
D. Cupola
20.The thermal efficiency of an air/fuel gas preheating recuperator may be as high as ____ percent?
A. 50
B. 65
C. 85
D. 50
21.Which of the following is not a recuperative furnace ?
A. Soaking pit
B. Reheating furnace
C. Steam boiler
D. Soaking pit
22.An example of shaft furnace is the___?
A. L.D. converter
B. Glass melting tank
C. Blast furnace
D. L.D. converter
23.During the constant rate period of drying of a solid ?
A. Increased air humidity decreases the rate of drying
B. Increasing the air temperature decreases the drying rate
C. Surface evaporation of unbound moisture occurs
D. Increased air humidity decreases the rate of drying
24.Humidification involves mass transfer between a pure liquid phase and a fixed gas, which is__?
A. Insoluble in the liquid
B. Soluble in the liquid
C. Non-ideal in nature
D. Insoluble in the liquid
25.The mass transfer co-efficient for a solid sphere of radius �a� dissolving in a large volume of quiescent liquid, in which �D� is the diffusivity of solute, is _?
A. D/a
B. D/2a
C. Proportional to ?D
D. D/a
26.Cox chart, which is useful in the design of distillation column particularly for petroleum hydrocarbons, is a plot of (where, P = vapor pressure, T = temperature) ?
A. log P vs. T
B. log P vs. log T
C. T vs. P
D. log P vs. T
27.The commonly used solvent in supercritical extraction is____?
A. Methyl ethyl ketone
B. Water
C. Carbon tetrachloride
D. Methyl ethyl ketone
28.For the same system, if the same liquid used in an absorber is decreased, the tower height will_?
A. Increase
B. Decrease
C. Remain unaffected
D. Increase
29.The equation, NA = (DAB . Pt /RTZ . PBM) (PA1 � PA2) is for_______?
A. Fick�s second law of diffusion
B. Steady state diffusion for stagnant case
C. Liquid M.T.C. by Higbie penetration theory
D. Fick�s second law of diffusion
30.Perforated plate towers are unique for solvent extraction because, they provide___?
A. Higher contact area
B. Better contact of the phase
C. Repeated coalescence & redispersion of the drop phase
D. Higher contact area
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