Machine Design Quiz | Machine Design Short Questions & Answers

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Questions
41 The sleeve or muff coupling is designed as a
A dun cylinder
B thick cylinder
C solid shaft
D hollow shaft

Answer: hollow shaft
42 Screws used for power transmission should have
A Low efficiency
B high efficiency
C very fine threads
D strong teeth

Answer: high efficiency
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43 A sliding bearing which operates without any lubricant present, is called
A zero film bearing
B boundary lubricated bearing
C hydrodynamic lubricated bearing
D hydrostatic lubricated bearing

Answer: zero film bearing
44 The difference between the tooth space and the tooth thickness as measured on the pitch circle, is called
A backlash
B face width
C working depth
D clearance

Answer: backlash
45 A locking device extensively used in marine type connecting rod ends is a
A ring nut
B sawn nut
C jam nut
D castle nut

Answer: ring nut
46 When a nut is tightened by placing a washer below it, the bolt will be subjected to
A tensile stress
B compressive stress
C shear stress
D none of these

Answer: tensile stress
47 When two non-intersecting and non-coplaner shafts are connected by gears, the arrangement is known as
A spiral gearing
B bevel gearing
C spur gearing
D helical gearing

Answer: spiral gearing
48 The maximum normal stress theory is used for
A brittle materials
B plastic materials
C ductile materials
D non-ferrous materials

Answer: brittle materials
49 The rolling contact bearings as compared to sliding contact bearings have
A small overall dimensions
B accuracy of shaft alignment
C low starting and low running friction except at very high speeds
D all of the above

Answer: all of the above
50 When the bearing is subjected to large fluctuations of load and heavy impacts, the bearing characteristic number should be __________ the bearing modulus.
A 5 times
B 10 times
C 15 times
D 20 times

Answer: 15 times
51 Which of the following screw thread is used for power transmission in one direction only.
A Acme threads
B Square threads
C Buttress threads
D Multiple threads

Answer: Buttress threads
52 A screw will be self locking, if
A friction angle is less than helix angle
B friction angle is more than helix angle
C friction angle is equal to helix angle
D efficiency of screw is 100%

Answer: friction angle is more than helix angle
53 The expression 0.175 – 0.841/T is the Lewis form factor for
A 2°composite and full depth involute system
B 20° full depth involute system
C 20° stub system
D none of the above

Answer: 20° stub system
54 The longitudinal stress is __________ of the circumferential stress.
A one-half
B two-third
C three-fourth
D double

Answer: one-half
55 A shaft is subjected to a maximum bending stress of 80 N/mm2 and maximum shearing stress equal to 30 N/mm2 at a particular section. If the yield point in tension of the material is 280 N/mm2 and the maximum shear stress theory of failure is used, then the factor of safety obtained will be
A 2.5
B 2.8
C 3.0
D 3.5

Answer: 2.8
56 When spring index increases, the value of Wahl’s stress factor
A increases linearly
B decreases linearly
C remains same
D increases exponentially

Answer: increases exponentially
57 Idler pulley is used for
A increasing velocity ratio
B for applying tension
C changing the direction of motion of belt
D all of these

Answer: for applying tension
58 In worm gears, the angle between the tangent to the pitch helix and an element of the cylinder, is known as
A helix angle
B pressure angle
C pitch lead angle
D none of these

Answer: helix angle
59 The cross-section of the arm of a bell crank lever is
A I-section
B elliptical
C rectangular
D any one of these

Answer: any one of these
60 In designing a sleeve coupling, length of the sleeve is taken as (where d = Diameter of the shaft)
A 3.5 d
B 2 d + 20 mm
C d + 17 mm
D 2 d + 13 mm

Answer: 3.5 d

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