Machine Design Quiz | Machine Design Multiple Choice Questions(MCQs) & Answers

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Questions
1 The taper on cotter varies from
A 1 in l5 to 1 in 10
B 1 in 24 to 1 in 20
C 1 in 32 to 1 in 24
D 1 in 48 to 1 in 24

Answer: 1 in 48 to 1 in 24
2 In leaf springs, the longest leaf is known as
A master leaf
B upper leaf
C lower leaf
D none of these

Answer: master leaf
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3 The bearings of heavy series have capacity __________ over the medium series.
A 20 to 30%
B 40 to 50%
C 10 to 20%
D 30 to 40%

Answer: 20 to 30%
4 The size of a gear is usually specified by
A pressure angle
B pitch circle diameter
C circular pitch
D diametral pitch

Answer: pitch circle diameter
5 The rolling contact bearings are known as
A thin lubricated bearings
B antifriction bearings
C thick lubricated bearings
D plastic bearings

Answer: antifriction bearings
6 Which of the following statement is wrong ?
A 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
B The V-belt drive is used with large centre distance
C The V-belt may be operated in either direction with tight side of the belt at the top or bottom
D The ratio of driving tensions in V-belt drive is more than flat belt drives

Answer: The V-belt drive is used with large centre distance
7 Two shafts A and B under pure torsion are of identical length and identical weight and are made of the same material. The shaft A is solid and the shaft B is hollow. We can say that
A shaft B is better than shaft A
B shaft A is better than shaft B
C both the shafts are equally good
D None of these

Answer: shaft B is better than shaft A
8 The load cup of a screw jack is made separate from the head of the spindle to
A enhance the load carrying capacity of the jack
B reduce the effort needed for lifting the working load
C prevent the rotation of load being lifted
D reduce the value of frictional torque

Answer: prevent the rotation of load being lifted
9 The resistance to fatigue of a material is measured by
A endurance limit
B ultimate tensile strength
C elastic limit
D Young’s modulus

Answer: endurance limit
10 Stress concentration is caused due to
A variations in properties of materials in a member
B abrupt change of cross-section
C variations in load acting on a member
D all of these

Answer: abrupt change of cross-section
11 A flanged pipe joint will be a leak-proof joint, if the circumferential pitch of the bolts is (where d = Diameter of bolt hole)
A less than 20 d
B greater than 30 d
C between 20 d and 30 d
D equal to inside diameter of pipe

Answer: between 20 d and 30 d
12 Which of the following statement is correct for gears?
A The pitch circle is always greater than the base circle
B The pitch circle diameter is equal to the product of module and number of teeth
C The addendum is less than dedendum
D all of the above

Answer: all of the above
13 In a hydrodynamic lubricated bearing
A there is a thick film of lubricant between the journal and the bearing
B there is a thin film of lubricant between the journal and the bearing
C there is no lubricant between the journal and the bearing
D the lubricant is forced between the journal and the bearing, by external pressure

Answer: there is a thick film of lubricant between the journal and the bearing
14 Surface endurance limit of gear material is dependent upon its
A elastic strength
B yield strength
C brinell hardness number
D toughness

Answer: brinell hardness number
15 The pipe joint mostly used for pipes carrying water at low pressures is
A socket joint
B nipple joint
C union joint
D spigot and socket joint

Answer: socket joint
16 The constant factor in case of R10 series of preferred numbers is
A 1.06
B 1.12
C 1.26
D 1.58

Answer: 1.26
17 In unilateral system of tolerance, the tolerance is allowed on
A one side of the actual size
B one side of the nominal size
C both sides of the actual size
D both sides of the nominal size

Answer: one side of the nominal size
18 An open belt drive is used when
A shafts are arranged parallel and rotate in the opposite directions
B shafts are arranged parallel and rotate in the same directions
C shafts are arranged at right angles and rotate in one definite direction
D driven shaft is to be started or stopped whenever desired without interferring with the driving shaft

Answer: shafts are arranged parallel and rotate in the same directions
19 When a bolt is subjected to shock loading, the resilience of the bolt should be considered in order to prevent breakage at the
A head
B shank
C thread
D middle

Answer: thread
20 Which of the following material has the maximum ductility?
A Mild steel
B Copper
C Zinc
D Aluminium

Answer: Mild steel

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