A metalloid possesses the characteristics of both the metals and non-metals. Which of the following is not a metalloid?
A. Arsenic
B. Antimony
C. Lead
D. None of these
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Hypo (sodium thiosulphate) because of its complex forming behaviour is used in photography to remove undecomposed silver bromide as a soluble complex for __________ of the picture.
A. Printing
B. Developing
C. Colour
D. Fixation
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Minimum diameter of the tube used for making water manometer should be __________ mm to avoid a correction for the effect of capillarity.
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Steel balls are manufactured by cold heading. After cold forming, they are subjected to
A. Tempering
B. Normalising
C. Stress-relieving
D. Artificial ageing
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__________ number is sometimes used in place of Grashoff number in free convection heat transfer.
A. Stanton
B. Brinkman
C. Rayleigh
D. Nusselt
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Which of the following is the most suitable for removing fine particles (< 1 micron diameter) from air below its dew point?
A. Venturi scrubber
B. Electrostatic precipitator
C. Cyclone separator
D. Fabric filter
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Volute casing of a centrifugal pump does not facilitate
A. Uniform flow of fluid coming out of the impeller
B. Increase in the pump efficiency
C. Conversion of the part of the velocity head to the pressure head
D. Conversion of the part of the pressure head to velocity head
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Function of gear box is to
A. Reduce the speed
B. Obtain variable speed
C. Increase the speed
D. Produce high torque
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Function of fusible plug in a boiler is to
A. Drain out water and sludge from the boiler during repair
B. Put off fire in the furnace when water level in the boiler falls to unsafe limit
C. Guard the boiler in case of abnormal rise in steam pressure
D. All of the above
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Co-efficient of performance of a Carnot cycle refrigerator operating between - 23°C and + 27°C is
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Which of the following gases cause global warming?
A. Carbon monoxide
B. Carbon dioxide
C. Nitrogen
D. Ozone
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Principal alloying element in Elinvar (used for making hair springs for watches) is
A. Copper
B. Aluminium
C. Nickel
D. Zinc
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The only suitable method for hardening the low carbon steel is case hardening. Which of the following is a case hardening process?
A. Cyaniding
B. Sheardising
C. Spherodising
D. None of these
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The life of a ball bearing is inversely proportional to
A. (load)1
B. (load)2
C. (load)3
D. (load)0.33
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Boiler rating is normally done in terms of
A. Steam temperature & pressure
B. Steam output (tons/hr)
C. Heat transfer rate (kcal/hr)
D. Heat transfer area (m2 )
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Which of the following is not an ore of aluminium?
A. Troosite
B. Kaolin
C. Alunite
D. Cryolite
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Which of the following is not an ore of aluminium?
A. Troosite
B. Kaolin
C. Alunite
D. Cryolite
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Matte smelting is used in the extraction of
A. Lead
B. Zinc
C. Aluminium
D. Copper
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Which of the following material handling equipments is not suitable for moving materials in varying paths?
A. Hand trolley
B. Belt conveyor
C. Crane
D. Truck
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Earing is a defect found in steels after the following metal working operation (s).
A. Deep drawing
B. Rolling
C. Extrusion
D. Wire drawing
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