______________ is not used as the control rod material in a nuclear reactor ?
(A) Cobalt
(B) Hafnium
(C) Cadmium
(D) Boron
Which of the following can be manufactured using powder metallurgy techniques ?
(A) Brake linings
(B) Bearings
(C) Carbide tool tips
(D) All A, B and C
Pick out the wrong statement about nucleate boiling ?
(A) Bubble generation is by expansion of entrapped gas/vapour at small cavities in the surface
(B) Surface temperature is greater than the saturation temperature of the liquid
(C) Heat transfer from the surface of the liquid is less than that in film boiling
(D) The temperature is less than that of film boiling
Latent heat of dry steam at atmospheric pressure is 539 Kcal/kg; which _____________ with increase in the pressure of steam?
(A) Decreases
(B) Increases
(C) Remain same
(D) May increase or decrease
With increasing carbon percent in steel beyond 0.8%, its ultimate tensile strength (UTS) and _____________ is not affected ?
(A) Impact strength
(B) Percent elongation
(C) Hardness
(D) Both B & C
The bank of tubes located at the back of the domestic refrigerators are the _______________ tubes?
(A) Refrigerant cooling
(B) Evaporator
(C) Condenser
(D) Throttling
Mho’s scale of hardness, which consists of 10 standard minerals is used for the measurement of _______________ hardness?
(A) Scratch
(B) Indentation
(C) Dynamic
(D) Rebound
Electrometallurgy is not involved in the extraction of ___________________ from its ore?
(A) Aluminium
(B) Tin
(C) Lead
(D) Both
Coarse grained steels have____________________?
(A) Low toughness
(B) No tendency to distort
(C) High density
(D) Very high toughness
Unbreakable crockeries are made from ______________ polymers?
(A) Polystyrene
(B) Melamine
(C) Polystyrene
(D) Polyurethane