981. The alloying element which increases residual magnetism and coercive magnetic force in steel for magnets is
A. chromium
B. nickel
C. vanadium
D. cobalt

982. Cast iron is manufactured in
A. blast furnace
B. cupola
C. open hearth furnace
D. bessemer converter

983. The lower critical point for all steels is
A. 600°C
B. 700°C
C. 723°C
D. 913°C

984. The humidity ratio or specific humidity is the mass of water vapour present in
A. 1 m3 of wet air
B. 1 m3 of dry air
C. 1 kg of wet air
D. 1 kg of dry air

985. The formation of frost on cooling coils in a refrigerator
A. increases heat transfer
B. improves C.O.P. of the system
C. increases power consumption
D. reduces power consumption

986. The by-pass factor for a cooling coil
A. increases with increase in velocity of air passing through it
B. decreases with increase in velocity of air passing through it
C. remains unchanged with increase in velocity of air passing through it
D. may increase or decrease with increase in velocity of air passing through it depending upon the condition of air entering

987. The difference between dry bulb temperature and wet bulb temperature, is called
A. dry bulb depression
B. wet bulb depression
C. dew point depression
D. degree of saturation

988. Haematite iron ore contains iron about
A. 30%
B. 45%
C. 55%
D. 70%

989. The material in which the atoms are arranged regularly in some directions but not in others, is called
A. amorphous material
B. mesomorphous material
C. crystalline material
D. none of these

990. Crystal structure of a material is, generally, examined by
A. naked eye
B. optical microscope
C. metallurgical microscope
D. X-ray techniques

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