The most serious manufacturing defect from fracture toughness point of view is____________________?

A. Surface roughness
B. Pores
C. Spherical inclusion
D. Crack

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

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

Which of the following is not the function of a volute casing provided in a centrifugal pump ?

A. To reduce the head loss in discharge
B. To increase the pump efficiency
C. To collect liquid from the periphery of the impeller and to transmit it to the delivery pipe at
constant velocity

The capacity of a spring to store energy is called the spring form co-efficient. Stiffness of a spring is measured by the____________________?

A. Ability to absorb shock
B. Capacity to store energy
C. Ratio of the wire & coil diameters
D. Load to produce unit deflection

______________________ is used as a material of construction for the blade of power saw ?

A. Wrought iron
B. Stainless steel
C. Mild steel
D. High speed steel

Addition of silicon to cast iron ___________________?

A. Promotes graphite module formation
B. Improves its ductility
C. Does not promote graphite flakes formation
D. Increases the fluidity of molten metal

The dew point temperature lines on psychrometric charts are straight inclined sloping downwards to the right. When relative humidity of moist air is 100%, then_________________?

A. Wet bulb temperature=dry bulb temperature
B. Wet bulb temperature=dew point temperature
C. Saturation temperature=dew point temperature
D. All ‘A’, ‘B’ & ‘C’

The elastic strain energy of a unit length of an edge dislocation as compared to that of a screw dislocation is____________________?

A. More
B. Equal
C. Less
D. Double

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