Related Questions
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4
The difference between gross & net calorific values of fuel is due to the
A. Sensible heat carried away by the flue gases
B. Heat carried away by the steam from the moisture content of the fuel
C. Heat lost by radiation
D. Heat carried away by steam from the combustion of hydrogen in the fuel
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4
Which of the following are made out of the carbon steel having carbon content of 0.9 to 1%?
A. Small punches, broaches reamers and springs
B. Cutlery, screws, rivets and files
C. Mandrels, twist drills, small lathe tools and razors
D. Forgings like can shaft, structural steel plate, threading dies and drawing dies
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4
Flue gases pass through the following boiler accessories in a high pressure natural circulation boiler.
A. Induced draft fan
B. Economiser
C. Air preheater
D. Steam superheater Which of the following gives the correct sequence of flow of the flue gases through the above mentioned boiler accessories?
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4
An abrupt and sudden fall in the reading of barometer is an indication of the
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4
An atom bomb works on the principle of
C. Both the nuclear fission & fusion
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4
Which of the following is the correct nature of shear stress distribution along the cross section in a horizontal circular pipe under steady state fluid flow condition?
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4
The kinematic viscosity (in stoke) and the absolute/dynamic viscosity (in poise) are the same for __________ at room temperature.
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4
Normalising does not __________ of a metal.
A. Improve machinability & tensile strength
B. Remove internal stresses
D. Remove strains caused by cold working
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4
Steel & cast iron pipes are produced by __________ casting.
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4
Austempering of steel requires it to be heated to 875°C followed by sudden cooling to 250-525°C, thereby changing austenite to
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4
Yield strength of a material is determined by the __________ test.
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4
A furnace is made of a refractory brick wall of thickness 0.5 metre and thermal conductivity 0.7 W/m.°K For the same temperature drop and heat loss, this refractory wall can be replaced by a layer of diatomaceous earth of thermal conductivity 0.14 W/m.K and thickness __________ metre.
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4
A thin, flat & square plate measuring 2 m × 2 m is freely hanging in ambient air at 25°C. It is exposed to the solar radiation falling on one side of the plate at the rate of 500 W/m2. The plate temperature will remain constant at 30°C, if the convective heat transfer co-efficient is __________ W/m2 °C.
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4
Alloys having more than 80% copper are generally more
C. Prone to season cracking
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4
__________ pipe is the most suitable for carrying sanitary drainage.
B. Reinforced cement concrete
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4
Which of the following test is used for distinguishing among dry oils, semi-drying oils and non drying oils?
B. Reichert-Meissl value test
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4
Surface tension of a liquid
A. Is due to intermolecular forces of cohesion
B. Decreases with rise in temperature
C. Is responsible for the spherical shape of an isolated liquid drop
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4
In multipass welds, shot peening is done after each pass to
A. Close the surface porosity
B. Break the continuity of columnar grains
D. Introduce texture in the weld
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4
A polymer is termed as an 'elastomer', if its percentage elongation is more than 100%. An elastomer is termed as 'rubber' if its percentage elongation is more than __________ percent.
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4
What is the value of entropy at 273°K?
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4
What is the pH of distilled water?
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4
A metal having a Poisson's ratio = 0.3 is elastically deformed under uniaxial tension. If the longitudinal strain = 0.8, then the magnitude of thickness strain is
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4
Maximum permissible sulphur content in steel is __________ percent.
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4
Mild steel has __________ crystal lattice structure.
A. Face centred cubic (fcc)
B. Body centred cubic (bcc)
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4
The critical pressure at which the latent heat of vaporisation of steam becomes zero is __________ Kg/cm2.
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4
Which of the following is resistant to the action of both heat & chemicals?
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4
For a small scale toy factory, the fixed cost per month is Rs. 5000/-. The variable cost per toy is Rs. 20 and sales price is Rs. 30 per toy. The break even production per month will be __________ toys.
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4
Rankine cycle comprises of two isothermal and two __________ processes.
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4
Tumbling is the process of improving the __________ of the materials/parts.
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4
Fibre reinforced plastic (FRP) are
A. Made of glass fibre and thermoplastic resins
C. Made of thermosetting resin and glass fibre