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Free download in PDF Machine Design Multiple Choice Questions(MCQs) & Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(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
(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%
(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
(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
(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
(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
(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
(20)
Which of the following material has the maximum ductility?
[A]
Mild steel
[B]
Copper
[C]
Zinc
[D]
Aluminium
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