021. The lower cylindrical portion of the piston which improves piston cooling performance is called
(A) Piston crown
(B) Connecting rod
(C) Piston pin boss
(D) Piston skirt
Answer: - Piston skirt
022. Damper in an automobile is used to
(A) Absorb the energy
(B) Dissipate the energy
(C) Release the energy
(D) Increase the energy
Answer: - Dissipate the energy
023. Inertia force acts
(A) perpendicular to the acceleration
(B) along the direction of acceleration
(C) opposite to the direction of acceleration
(D) none of the above
Answer: - opposite to the direction of acceleration
024. Klein’s construction gives a graphical construction for
(A) slider-crank mechanism
(B) velocity polygon
(C) acceleration polygon
(D) four bar chain mechanism
Answer: - slider-crank mechanism
025. A circle passing through the pitch point with its center at the center of cam axis is known as
(A) pitch circle
(B) base circle
(C) prime circle
(D) outer circle
Answer: - pitch circle
026. A stud
(A) has a head on one end and a nut fitted to the other
(B) has head at one end and other end fits into a tapped hole in the other part to be joined
(D) requires locking nuts
Answer: - has both the ends threaded
027. Mild steel belongs to the following category
(A) low carbon steel
(B) medium carbon steel
(C) high carbon steel
(D) all of these
Answer: - low carbon steel
028. Which of the following constituents of steels is softest and least strong?
(A) austenite
(B) pearlite
(C) ferrite
(D) cementite
Answer: - ferrite
029. Gamma iron exits at following temperature
(A) room temperature
(B) near melting point
(C) between 1400°C and 1539°C
(D) between 910°C and 1400°C
Answer: - between 910°C and 1400°C
030. The unique property of cast iron is its high
(A) malleability
(B) ductility
(C) surface finish
(D) damping characteristics
Answer: - damping characteristics
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