Theoretical volume of oxygen required for complete combustion of 1Nm3 of acetylene, in oxy-acetylene welding is ______________ Nm3 ?
(A) 0.5
(B) 1
(C) 1/3
(D) 2.5
A high pressure boiler generates steam at a pressure greater than _____________________ kg/cm2 ?
(A) 10
(B) 30
(C) 50
(D) 80
The best lubricants for a machine working at high temperature & load is_________________?
(A) Grease
(B) Solid lubricant
(C) Animal oils
(D) Mineral oils
The difference between gross & net calorific values of fuel is due to the___________________?
(A) Sensible heat carried away by the flue gases
(B) Heat carried away by the steam from the moisture content of the fuel
(C) Heat lost by radiation
(D) Heat carried away by steam from the combustion of hydrogen in the fuel
Speisses is a mixture of the following ?
(A) Arsenides of heavy metals
(B) Antimonides of heavy metals
(C) Arsenides & antimonides of heavy metals
(D) Iron, cobalt and nickel
Factor of safety in machine design is defined as the ratio of ultimate stress to _____________ stress ?
(A) Working
(B) Bearing
(C) Yield
(D) None of these
Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative cooling is equal to the ______________ temperature of air?
(A) Wet bulb
(B) Dry bulb
(C) Saturation
(D) Dew point
The elastic strain in copper is due to the__________________?
(A) Motion of dislocations
(B) Stretching of atomic bonds
(C) Breakage of atomic bonds
(D) None of the above
Which of the following fastening devices has a head at one end and a nut fitted to the other ?
(A) Bolt
(B) Stud
(C) Top bolt
(D) None of these
Chromium molybdenum steel cannot be welded using ______________ welding ?
(A) Thermit
(B) Electrical resistance
(C) Oxy-acetylene
(D) Any of these