A steam carrying pipeline is insulated with two layers of insulating materials with the inferior insulation material forming the inner part. If the two insulating layers are interchanged, the heat conducted will____________________?

A. Increase
B. Decrease
C. Remain unaffected
D. May increase or decrease; depends on the thickness of each layer

Fibrous fracture is normally encountered in the ____________________ materials?

A. Hard
B. Elastic
C. Ductile
D. Brittle

Fire in fuel gas pipelines is extinguished most effectively by _________________?

A. Spraying water
B. Blanketting the area with nitrogen atmosphere
C. Fire fighting foam
D. None of these

In fluid flow, and heat and mass transfer, one encounters (i) kinematic velocity (μ), (ii) molecular diffusivity (ζ) and thermal diffusivity (α). The units of these quantities are ?

A. μ , α and θ all have units of m/s
B. μ , α and θ all have units of m2/s
C. α and θ have units of m2/s, while μ has unit of m/s
D. α and θ have units of m/s, while μ has unit of m2/s

Addition of small amount of ________________ to grey cast iron is done to produce nodular grey cast iron ?

A. Manganese
B. Phosphorous
C. Magnesium
D. Chromium

Which of the following is the most suitable material of construction for the condenser tubes, where the cooling medium is brine (salty water) ?

A. Aluminium
B. Copper
C. Titanium
D. Stainless steel

There are one octahedral void and ______________ tetrahedral void in the closest packing of atoms ?

A. One
B. Two
C. Three
D. None of these

Temper brittleness of a material can be fairly detected by the ________________ test ?

A. Fatigue
B. Notched bar impact
C. Tensile
D. Hardness

Broaching tools are usually made of____________________?

A. Cermets
B. High speed steel
C. Tungsten carbide
D. Stellite

The main reducing agent in iron blast furnace is____________________?

A. Carbon dioxide
B. Carbon monoxide
C. Oxygen
D. Air