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.Management Sciences
Category: Materials and Construction
Zinc is highly ______________ at room temperature?
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A. Ductile
B. Resistant to atmospheric corrosion
C. Malleable
D. Brittle
The behaviour of visco-elastic material is time dependent. This behaviour is common in _____________ materials?
A. Non-crystalline solid
B. Crystalline
C. Rubbery
D. Non-crystalline organic polymeric
Softening of hardened steel is done by its_____________________?
A. Normalising
B. Tempering
C. Annealing
D. Carburising
The temperature at which new grains are formed in the metal is called the ______________ temperature?
A. Eutectic
B. Recrystallisation
C. Upper critical
D. Lower critical
Slow and progressive deformation of a material with time under constant stress is called___________________?
A. Creep
B. Erosion
C. Resilience
D. None of these
For platinum thermocouples, lead wires are made of___________________?
A. Copper & copper-nickel alloys
B. Copper & iron
C. Iron & nickel
D. Tin & nickel
Rotary driers are generally made of_______________?
A. Cast iron
B. Mild steel
C. High silicon iron (14% Si)
D. Tin lined with refractory bricks
Fatigue failure of a material results from ______________ stress?
A. Tensile
B. Compressive
C. Fluctuating
D. None of these
Which of the following is the most widely used insulating material for steam carrying pipelines ?
A. Ceramic fibre blanket
B. Glass wool and 85% magnesia
C. Vermiculite
D. Slag wool
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