Machine Design MCQ Questions & Answers

51

A spring of stiffness 1000 N/m is stretched initially by 100 mm from the undeformed position. The work required to stretch it by another 100 mm is

A) 5 N-m B) 7 N-m C) 10 N-m D) 15 N-m

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Answer & Solution

Answer: Option D

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52

A steel containing up to 0.15% carbon is known as

A) Mild steel B) Dead mild steel C) Medium carbon steel D) High carbon steel

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Answer & Solution

Answer: Option B

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53

A steel containing 0.8% carbon is known as

A) Eutectoid steel B) Hypereutectoid steel C) Hypo-eutectoid steel D) None of these

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Answer & Solution

Answer: Option A

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54

The rocker arms in internal combustion engines are of __________.

A) First type levers B) Second type levers C) Third type levers D) None of these

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Answer & Solution

Answer: Option A

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55

Gears are casted by

A) Sand mould casting B) Slush casting C) Permanent mould casting D) Centrifugal casting

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Answer & Solution

Answer: Option C

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56

Basic shaft is one

A) Whose upper deviation is zero B) Whose lower deviation is zero C) Whose lower as well as upper deviations are zero D) Does not exist

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Answer & Solution

Answer: Option A

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57

Which of the following statement is wrong?

A) The solid length of a spring is the product of total number of coils and the diameter of the wire B) The spring index is the ratio of mean diameter of the coil to the diameter of the wire C) The spring stiffness is the load required per unit deflection of the spring D) The pitch of the coil is the axial distance between adjacent coils in the compressed state

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Answer & Solution

Answer: Option D

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58

Which of the following statement is wrong?

A) The V-belt may be operated in either direction with tight side of the belt at the top or bottom B) The V-belt drive is used with large center distance C) The power transmitted by V-belts is less than flat belts for the same coefficient of friction, arc of contact and allowable tension in the belts D) The ratio of driving tensions in V-belt drive is more than flat belt drives

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Answer & Solution

Answer: Option B

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59

Which of the following statement is wrong?

A) The pitch of rivets is obtained by equating the tearing resistance of the plate to the shearing resistance of the rivets B) The pitch of rivets should not be less than 2d, where d is the diameter of rivet hole C) The maximum value of the pitch of rivets for a longitudinal joint of a boiler, as per I.B.R., is given by Pmax = C.t + 41.28 mm D) According to I.B.R., the thickness of butt strap shall not be less than 5 mm

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Answer & Solution

Answer: Option D

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60

Which of the following statement is wrong?

A) A key is used as a temporary fastening B) A key is subjected to tensile stresses C) A key is always inserted parallel to the axis of the shaft D) A key prevents relative motion between the shaft and boss of the pulley

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Answer & Solution

Answer: Option B

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Machine Design MCQ Questions & Answers | Mechanical Engineering