Machine Design Quiz | Machine Design Objective Type Questions & Answers

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Questions
21 The value of stress concentration factor depends upon
A material of the part
B geometry of the part
C material and geometry of the part
D none of these

Answer: material and geometry of the part
22 In order to avoid tearing of the plate at an edge, the distance from the centre line of the rivet hole to the nearest edge of the plate should be equal to (where d = Diameter of rivet hole)
A d
B 1.5 d
C 2 d
D 2.5 d

Answer: 1.5 d
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23 According to Unwin’s formula, the relation between the diameter of rivet hole (d) and the thickness of plate (t) is given by (where d and t are in mm)
A d = t
B d = 1.6 t
C d = 2 t
D d = 6 t

Answer: d = 6 t
24 In radial cams, the follower moves
A in a direction perpendicular to the cam axis
B in a direction parallel to the cam axis
C in any direction irrespective of cam axis
D along the cam axis

Answer: in a direction perpendicular to the cam axis
25 When screw threads are to be used in a situation where power is being transmitted in one direction only, then the screw threads suitable for this will be
A square threads
B acme threads
C knuckle threads
D buttress threads

Answer: buttress threads
26 The ball bearings are provided with a cage
A to facilitate slipping of balls
B to reduce friction
C to maintain the balls at a fixed distance apart
D to prevent the lubricant from flowing out

Answer: to maintain the balls at a fixed distance apart
27 A column is known as a long column if the slenderness ratio is
A 100
B 40
C 50
D 70

Answer: 100
28 The velocity of sliding __________ the distance of the point of contact from the pitch point.
A is directly proportional to
B is inversely proportional to
C is equal to cos φ multiplied by
D does not depend upon

Answer: is directly proportional to
29 According to Indian standard specifications, 100 H6/g5 means that the
A actual size is 100 mm
B basic size is 100 mm
C difference between the actual size and basic size is 100 mm
D none of the above

Answer: basic size is 100 mm
30 Slenderness ratio is the ratio of
A maximum size of column to minimum size of column
B width of column to depth of column
C effective length of column to least radius of gyration of the column
D effective length of column to width of column

Answer: effective length of column to least radius of gyration of the column
31 A locking device in which the bottom cylindrical portion is recessed to receive the tip of the locking set screw, is called
A castle nut
B jam nut
C ring nut
D sawn nut

Answer: ring nut
32 A transmission shaft includes
A counter shaft
B line shaft
C over head shaft
D all of these

Answer: all of these
33 In a flange coupling, the flanges are coupled together by means of
A bolts and nuts
B studs
C headless taper bolts
D none of these

Answer: bolts and nuts
34 Soderberg relation is based on __________ of the material whereas all other failure relation for dynamic loading are based on ultimate strength of the material.
A elastic strength
B yield strength
C shear strength
D None

Answer: yield strength
35 In second type of levers,
A load is in between the fulcrum and effort
B effort is in between the fulcrum and load
C fulcrum is in between the load and effort
D none of these

Answer: load is in between the fulcrum and effort
36 For unequal width of butt straps, the thickness of butt straps are
A 0.75 t for wide strap on the inside and 0.625 t for narrow strap on the outside
B 0.75 t for narrow strap on the inside and 0.625 t for wide strap on the outside
C 0.75 t for both the straps on the inside and outside
D 0.625 t for both the straps on the inside and outside

Answer: 0.75 t for wide strap on the inside and 0.625 t for narrow strap on the outside
37 The application of third type levers is found in
A handle of a hand pump
B hand wheel of a punching press
C lever of a loaded safety valve
D a pair of tongs

Answer: a pair of tongs
38 A screw is said to be over hauling screw, if its efficiency is
A less than 50%
B more than 50%
C equal to 50%
D none of these

Answer: more than 50%
39 The number of slots in a 25 mm castle nut is
A 2
B 4
C 6
D 8

Answer: 6
40 When bevel gears connect two shafts whose axes intersect at an angle greater than a right angle and one of the bevel gears has a pitch angle of 90°, then they are known as
A angular bevel gears
B crown bevel gears
C internal bevel gears
D mitre gears

Answer: crown bevel gears

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