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Home » Engineering » Aptitude Test - 107
Hassan
1.The heating capacity of muffle furnace depends on the__?
A. Surface area & emissivity of the stock
B. Properties of the muffle wall (temperature, area, and emissivity)
C. Both A. & B.
D. Surface area & emissivity of the stock
2.Furnace aerodynamics is related to the ____ in the furnace?
A. Movement of gases
B. Measurement of flue gas volume
C. Temperature control
D. Movement of gases
3.Which of the following is a periodic furnace ?
A. Tunnel kiln
B. Rotary kiln
C. Soaking pit
D. Tunnel kiln
4.Pulverised fuel fired furnaces employ _____ fuel firing?
A. Horizontal
B. Vertical
C. Tangential
D. Horizontal
5.Main gas valve in a gaseous fuel burner is a ____ valve?
A. Gate
B. Butterfly
C. Globe
D. Gate
6.Which is not a hearth furnace ?
A. Glass tank furnace
B. Open hearth furnace
C. Cupola
D. Glass tank furnace
7.Combustion of fuel in a furnace with oxygen enriched air results in higher__?
A. Flue gas volume
B. Flame temperature
C. Fuel consumption
D. Flue gas volume
8.Regenerators compared to the recuperators for the same duty___?
A. Occupy more space
B. Are less costly
C. Are of smaller size
D. Occupy more space
9.Ceramic recuperators compared to metallic recuperators for the same duty___?
A. Are lighter
B. Occupy more space
C. Are less costly
D. Are lighter
10.Rate of heat release in a furnace, which is the measure of heat intensity, is defined as__?
A. kcal/hr/m3 combustion space
B. kcal/m3 combustion space
C. kcal/hr
D. kcal/hr/m3 combustion space
11.Design of waste heat boiler for recovery of waste heat from furnace gases depends upon the____?
A. Quantity & temperature of waste gas
B. Dust concentration & nature of dust in waste gas
C. Corrosive nature of the waste gas
D. Quantity & temperature of waste gas
12.Maximum heat transfer in high temperature furnaces is by___?
A. Conduction
B. Convection
C. Radiation
D. Conduction
13.Decarburisation of steel__?
A. Is the removal of carbon from iron carbide (Fe3C)
B. Affects its crystalline structure
C. Is favoured by CO2
D. Is the removal of carbon from iron carbide (Fe3C)
14.Hearth furnaces are not used for___?
A. Roasting
B. Melting
C. Reheating
D. Roasting
15.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
16.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
17.Ceramic recuperators (made of SiC) is economical, only when used for preheating combustion air above ____ °C?
A. 250
B. 650
C. 850
D. 250
18.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
19.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
20.Thermal efficiency of an open hearth furnace may be about ______ percent?
A. 5
B. 20
C. 50
D. 5
21.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
22.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
23.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
24.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
25.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
26.Reheating furnace (pusher type) is used for heating____?
A. Ingots
B. Slabs
C. Steel coils
D. Ingots
27.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
28.Scaling of furnace stock is reduced by ______ in flue gas?
A. CO
B. H2
C. High CO/CO2
D. CO
29.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
30.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
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