A. Plastic deformation of material does not occur
B. Initiation of crack from below the surface does not occur
C. Initiation of crack occurs on the surface of the machine part
D. Presence of both rough & smooth zone with conchoidal markings in smooth zone of the
Related Mcqs:
- Fatigue limit improvement by over stressing the metal by successively increasing the load is called coaxing. In fatigue failure, the material fails ?
A. Below the yield point
B. Above the yield point
C. Below the elastic limit
D. At the elastic limit - The materials which fracture even at small strains are termed as brittle, while those materials which exhibit an appreciable deformation before failure are termed as__________________?
A. Rigid
B. Tough
C. Ductile
D. Plastic - The most serious manufacturing defect from fracture toughness point of view is____________________?
A. Surface roughness
B. Pores
C. Spherical inclusion
D. Crack - Fibrous fracture is normally encountered in the ____________________ materials?
A. Hard
B. Elastic
C. Ductile
D. Brittle - In an amorphous material, atoms defy any definite atomic structure and exist in random pattern just like in liquid. Which of the following is an amorphous material ?
A. Tin
B. Lead
C. Zinc
D. Glass - Out of the following, the best material capable of withstanding shock & vibration without the danger of cracking is ___________________?
A. Malleable iron
B. Grey cast iron
C. Chilled cast iron
D. White cast iron - 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 - Which of the following is not a ferromagnetic material ?
A. Nickel
B. Cobalt
C. Aluminium
D. Iron - A long cylinder and a sphere both of 5 cms diameter are made from the same porous material. The flat ends of cylinder are sealed. Both the cylinder and sphere are saturated with the same solution of sodium chloride. Later both the objects are immersed for a short and equal interval of time in a large tank of water which is well agitated. The fraction of salt remaining in the cylinder and the sphere are Xc and Xs respectively. Which of the following statement is correct ?
A. Xc > Xs
B. Xc = Xs
C. Xc < Xs
D. Xc greater/less than Xs depending on the length of the cylinder - 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
