Superheating of steam is done at constant
A. Enthalpy
B. Entropy
C. Pressure
D. Volume
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Pick out the wrong statement.
A. The X-rays can not be deflected by electric field unlike cathode rays
B. The intensity of X-rays can be measured by ionisation current produced due to the ionisation of gas by X-rays
C. The quality of X-rays can be controlled by varying the anode-cathode voltage
D. Crystal structure of a material can be studied by an electron microscope
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Gas carrying pipelines are best joined by
A. Nuts & bolts
B. Rivetting
C. Welding
D. None of these
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Out of the following, the rays having the lowest wavelength is the
A. Radio waves
B. Ultrasonic waves
C. Infra red rays
D. X-rays
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In Newton's law of viscosity, which states that the shear stress is proportional to the __________ co-efficient of viscosity is called dynamic or absolute viscosity (where, V = velocity, V g = velocity gradient).
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Galena is an ore of
A. Iron
B. Copper
C. Lead
D. Aluminium
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Galvanic corrosion
A. Occurs in a bimetal couple
B. Occurs in highly stressed metallic parts only
C. Is exemplified by caustic embrittlement of boiler tubes
D. Is also called dezincification
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Volumetric composition of flue gas analysed with the Orsat apparatus is : CO2 = 12%, O2 = 8%, CO = nil, N2 = 80%. This flue gas composition indicates that
A. Pure oxygen has been used for combustion
B. Nitrogen percentage in the fuel is very high
C. Excess air has been used for combustion
D. Hydrogen is not present in the fuel
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Age hardening is connected with
A. Babbit metal
B. Gun metal
C. Stainless steel
D. Duralumin
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The main charge in blast furnace is usually
A. Iron ore & coke
B. Iron ore, coke & air
C. Limestone, coke & iron ore
D. Limestone, sand & iron ore
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Heat release during phase change is observed in case of a/an
A. Boiler
B. Condenser
C. Evaporator
D. All of the above
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For dynamic strain measurement, the wheatstone bridge used is of __________ type.
A. Voltage sensitive null
B. Voltage sensitive deflected
C. Current sensitive deflected
D. None of these
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Catalyst used in the 'catalytic converter' employed in automobile exhaust line for complete combustion/oxidation of carbon monoxide, nitrogen oxides and hydrocarbons is
A. Alumina
B. Platinum
C. Vanadium pentoxide
D. Iron oxide
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Ammonia leakage in the refrigeration system is detected by
A. Sulphur stick, which on detection gives white smoke
B. Using chemical reagents
C. Its smell
D. Soap solution
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Knocking tendency in a petrol engine decreases with increasing
A. Supercharging
B. Compression ratio
C. Wall temperature
D. Engine speed
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Glass reacts with
A. H2 SO3
B. HF
C. HNO3
D. K2 Cr2 O7
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The conventional mechnical transducer, which converts pressure signal to displacement signal is
A. Spring
B. Manometer
C. Strain gauge
D. None of these
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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
A. -0.8
B. 0.8
C. +0.08
D. -0.24
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Photographic plates are coated with
A. Silver nitrate
B. Silver halide
C. Calcium silicate
D. Metallic silver
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A fine grained grinding wheel should not be used for grinding __________ materials.
A. Hard
B. Brittle
C. Soft & ductile
D. None of these
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