Which of the following equipments is used for liquid dispersion ?
(A) Packed column
(B) Venturi scrubber
(C) Bubble cap plate column
(D) Wetted wall column
Which of the following metals cannot be hot worked at room temperature ?
(A) Zinc
(B) Nickel
(C) Lead
(D) Tin
Which of the following phenomenon will exhibit the minimum heat transfer ?
(A) Boiling
(B) Forced convection in air
(C) Free convection in air
(D) Conduction in air
Corrosion is____________________?
(A) A physical phenomenon
(B) A chemical phenomenon
(C) Same as erosion
(D) An uncontrollable phenomenon
Super heating of steam is done at constant___________________?
(A) Enthalpy
(B) Entropy
(C) Pressure
(D) Volume
Silicon in steel__________________?
(A) Makes it usable in almost all magnetic circuits where alternating current is used
(B) Increases its electrical resistivity and decreases the hysteresis loss
(C) Is present upto 5% & 4% respectively when used in transformers & motor armatures
(D) All ‘A’, ‘B’ & ‘C’
Temperature of hot gases flowing in a pipe is measured by a thermocouple inserted in the thermal well. The thermal well made of ______________ will facilitate the most accurate measurement of the temperature ?
(A) Copper
(B) Steel
(C) Aluminium
(D) Brass
Fahrenheit and Centigrade scales have the same readings at _____________________?
(A) -55°
(B) -40°
(C) -33°
(D) -58°
Increasing sulphur content in pig iron tends to make it ________________?
(A) Soft
(B) Hard
(C) Tough
(D) Ductile & malleable
The substance used as a smoke screen in warfare is___________________?
(A) C2H2
(B) SiCl4
(C) P2O5
(D) PCl5