Austempering of steel requires it to be heated to 875°C followed by sudden cooling to 250- 525°C, thereby changing austenite to___________________?
(A) Sorbite
(B) Bainite
(C) Martensite
(D) Troostite
With decrease in the grain size of a material, its creep resistance___________________?
(A) Increases
(B) Decreases
(C) Remain constant
(D) Either
An oxidation process is accompanied with decrease in the____________________?
(A) Number of electrons
(B) Oxidation number
(C) Number of ions
(D) All A ,
Saturated steam at a pressure of 25 kg/cm2 is throttled to attain 5 kg/cm2. Then the outcoming steam will be_________________?
(A) Wet
(B) Saturated
(C) Superheated
(D) None of these
For the Stoke’s law to be valid in the case of a falling sphere in a fluid, the_____________________?
(A) Reynolds number (based on sphere diameter) should be < 1
(B) Flow around the sphere should be in turbulent region
(C) Sphere must be metallic
(D) Fluid density should be constant
An abrupt and sudden fall in the reading of barometer is an indication of the____________________?
(A) Storm
(B) Rain
(C) Clear weather
(D) Cold wave
Out of the following, the lowest packing of atoms exists in ____________________ crystal lattice structure?
(A) Hexagonal close, packed (hcp)
(B) Face centred cubic (fcc)
(C) Body centred cubic (bcc)
(D) Simple cubic
Atomic _______________ is a whole number for an element?
(A) Number
(B) Weight
(C) Radius
(D) None of these
Titanium is produced by ___________________ of Ti Cl4 ?
(A) Electrolytic reduction
(B) Calcium reduction
(C) Magnesium reduction
(D) Thermal dissociation
Metallic surveying tapes are made of _____________ which has a low co-efficient of expansion & enough strength ?
(A) Invar
(B) Hastelloy
(C) Duralumin
(D) Monel metal