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11.In troposphere (the weather domain), the temperature ‘t’ at height ‘h’ above the sea level in metres is given by (where, temperature at sea level is 15°C and t is in °C.)
t = 15 – 0.0065 h
t = 15 + 0.0065 h
t = 0.0035 h – 15
t = 15 – 0.0035 h
12.A high pressure boiler generates steam at a pressure greater than __________ kg/cm2 .
10
30
50
80
13.Evaporative cooling process employs a combination of cooling and humidification in which the
sensible heat is added.
sensible heat is removed and the latent heat is added.
latent heat is removed.
sensible heat is added and latent heat is removed.
14.Which of the following is not an explosive ?
TNT
CMC
RDX
Lead azide
16.Annealing ofwhite cast iron produces __________ iron.
grey
nodular
malleable
spheroidal
17.Resistance of an electrical conductor is proportional to its (where, l = length and A = cross-sectional area of the conductor)
A
l
A2
both ‘a’ & ‘b’
18.A solar cell converts the sunlight directly into __________ energy.
thermal
electrical
mechanical
chemical
19.If a nuclear reactor produces more fissile nuclear fuel than it consumes, then it is called a __________ reactor.
critical
breeder
fertile
heterogenous
20.Wrought iron is never shaped by
casting
cold working
forging
welding
21.Powder metallurgy process does not make metal powder by
atomisation
grinding/milling
hammering
electrolytic deposition
22.In the blast furnace, incorporation of water vapour in the blast gives the following effect.
Increases the reducing potential of the gas.
Increases the flame temperature.
No significant change occurs.
Increases the hydrogen content in the metal.
23.Pick out the wrong statement.
A ferromagnetic material becomes paramagnetic above the ‘Curie temperature’.
Permanent magnets are made of hard materials, whereas electromagnets require soft magnetic materials.
Soft magnetic materials (e.g., pure iron) have higher permeability and low hysterisis loss and coercive forces.
Tungsten steel and alnico are not hard magnetic materials.
24.The usual energy consumption in electric arc furnace steel making is __________ KWh/ton of steel.
60 – 100
400 – 700
1200 -1500
2000 – 2300
25.Maximum permissible air velocity in pipelines is about __________ metre/second.
5
10
20
40
26.Area under the stress-strain curve upto the __________ is referred to as the modulus of resilience.
yield strength
elastic limit
proportional limit
maximum point
27.
__________ is the hardest oxide and is hence used where high wear resistance at high temperature is required.
Beryllia
Zirconia
Alumina
Magnesia
28.
Titanium alloys are welded using the Following process:
TIG welding.
Submerged arc welding.
Butt welding.
Electron beam welding.
29.
An alloy of Fe – 0.4 % C is
cast iron.
hypo-eutectoid steel.
hyper-eutectoid steel.
eutectoid steel
30.
A material in which the atoms are arranged regularly in some directions but not in others, is termed as ‘mesomorphous material’; an example of which is
lead
glass
mica
silver