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Quiz 6
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Q.1
A bolt of M 24 × 2 means that
The pitch of the thread is 24 mm and depth is 2 mm
Cross-sectional area of the threads is 24 mm²
The nominal diameter of bolt is 24 mm and pitch is 2 mm
The effective diameter of bolt is 24 mm and there are 2 threads per cm
Q.2
The following type of nut is used with alien bolt
Hexagonal nut
Slotted nut
Castle nut
Any one of the above
Q.3
According to I.B.R., when the thickness of boiler shell (t) is greater than 8 mm, then the diameter of rivet hole (d) is obtained by
Equating tearing resistance of the plate to the shearing resistance of the rivets
Equating tearing resistance of the plate to the crushing resistance of the rivets
Equating shearing resistance to the crushing resistance of the rivets
None of the above
Q.4
According to I.B.R., when the thickness of the boiler shell (t) is less than 8 mm, then the diameter of the rivet hole (d) is obtained by
Equating tearing resistance of the plate to the shearing resistance of the rivets
Equating tearing resistance of the plate to the crushing resistance of the rivets
Equating shearing resistance to the crushing resistance of the rivets
None of the above
Q.5
Shaft coupling is used in machinery to
Introduce mechanical flexibility
Introduce protection against over loads
Reduce the transmission of shock loads
All of these
Q.6
The stress induced in the belt is,
Tensile stress
Compressive stress
Direct shear stress
Torsional shear stress
Q.7
A connecting rod subjected to an axial load may buckle with
X-axis as neutral axis
Y-axis as neutral axis
X-axis or Y-axis as neutral axis
Z-axis
Q.8
Wire ropes as compared to cotton ropes
Are lighter in weight
Offer silent operation
Can withstand shock loads
All of these
Q.9
In the calculation of induced shear stress in helical springs, the Wahl's stress factor is used to take care of
Combined effect of transverse shear stress and bending stress in the wire
Combined effect of bending stress and curvature of the wire
Combined effect of transverse shear stress and curvature of wire
Combined effect of torsional shear stress and transverse shear stress in the wire
Q.10
Which of the following statement is correct, for two shafts connected in parallel?
Torque in each shaft is the same
Shear stress in each shaft is the same
Angle of twist of each shaft is the same
Torsional stiffness of each shaft is the same
Q.11
The value of stress concentration factor depends upon
Material and geometry of the part
Geometry of the part
Material of the part
None of these
Q.12
A hollow saddle key is
A taper key which fits half in the key way of hub and half in the key way of shaft
A taper key which fits in a key way of the hub and is flat on the shaft
A taper key which fits in a key way of the hub and the bottom of the key is shaped to fit the curved surface of the shaft
Provided in pairs at right angles and each key is to withstand torsion in one direction only
Q.13
If d is the normal diameter of a bolt in mm, then the initial tension in kg in a bolt used for making a fluid tight joint as for steam engine cover joint is calculated by the relation
124 d
138 d
151 d
168 d
Q.14
Cold working
Increases the fatigue strength
Decreases the fatigue strength
Has no influence on fatigue strength
Alone has no influence on fatigue strength
Q.15
A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is τ. The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be
τ/2
τ
2 τ
4 τ
Q.16
The shock resistance of steel is increased by adding
Nickel
Chromium
Nickel and chromium
Cobalt and molybdenum
Q.17
While designing a screw in a screw jack against buckling failure, the end conditions for the screw are taken as
Both the ends fixed
Both the ends hinged
One end fixed and the other end hinged
One end fixed and the other end free
Q.18
At low temperatures (say 75°C) the notched bar impact value of steel
Increases markedly
Decreases markedly
Remain same
Depends on heat treatment carried out
Q.19
Cap screws are
Similar to small size tap bolts except that a greater variety of shapes of heads are available
Slotted for a screw driver and generally used with a nut
Used to prevent relative motion between parts
Provided with detachable caps
Q.20
All stresses produced in a belt are
Compressive stresses
Tensile stresses
Both tensile and compressive stresses
Shear stresses
Q.21
The included angle for the British Association thread is
29°
55°
47.3°
60°
Q.22
The difference between the tooth space and the tooth thickness as measured on the pitch circle, is called
Working depth
Clearance
Backlash
Face width
Q.23
In nitrated parts, the origins of the fatigue cracks will occur at
Surface
Just below the surface
Within the core
None of the above
Q.24
The process extensively used for making bolts and nuts is
Hot piercing
Extrusion
Cold peening
Cold heading
Q.25
In a marine flange coupling, the pitch circle diameter of bolts is taken as
1.2 d
1.6 d
2 d
2.5 d
Q.26
A sliding bearing in which although lubricant is present, the working surfaces __________ contact each other at least part of the time, is called boundary lubricated bearing.
Partially
Fully
Either A or B
None of these
Q.27
In a steam engine, the valve rod is connected to an eccentric rod by means of
Cotter joint
Knuckle joint
Universal joint
Flange coupling
Q.28
An elastic bar is fixed at the upper end and loaded at the lower end by a falling weight. The shock load produced can be reduced by
Increasing the length of bar
Decreasing the cross-sectional area of the bar
Decreasing the modulus of elasticity of the bar
All of the above
Q.29
Basic hole is one
Whose upper deviation is zero
Whose lower deviation is zero
Whose lower as well as upper deviations are zero
Does not exist
Q.30
Tapered roller bearings can take
Axial load only
Both radial and axial loads and the ratio of these being greater than unity
Radial load only
Both radial and axial loads and the ratio of these being less than unity
Q.31
The power transmitted by means of a belt depends upon
Velocity of the belt
Tension under which the belt is placed on the pulleys
Arc of contact between the belt and the smaller pulley
All of the above
Q.32
In a multiple V-belt drive, if one of the belts break, then
Only the broken belt is replaced
The entire set of belts is replaced
The broken belt and the belt on either side of it, is replaced
The broken belt need not to be replaced
Q.33
The resultant axial load on a bolt depends upon
External load applied
Initial tension due to tightening of the bolt
Relative elastic yielding of the bolt and the connected members
All of the above
Q.34
In most machine members, the damping capacity of the material should be
Low
Zero
High
Could be anything
Q.35
Which of the following bearing is preferred for oscillating conditions?
Double row roller bearing
Taper roller bearing
Angular contact single row ball bearing
Needle roller bearing
Q.36
The contact ratio for gears is
Zero
Less than one
Greater than one
None of these
Q.37
Which of the following material has the maximum ductility?
Copper
Mild steel
Aluminium
Zinc
Q.38
In radial bearings, the load acts __________ to the axis of rotation.
Parallel
Perpendicular
Both A and B
None of these
Q.39
Basic shaft is one
Whose upper deviation is zero
Whose lower deviation is zero
Whose lower as well as upper deviations are zero
Does not exist
Q.40
Which of the following statement is wrong?
The solid length of a spring is the product of total number of coils and the diameter of the wire
The spring index is the ratio of mean diameter of the coil to the diameter of the wire
The spring stiffness is the load required per unit deflection of the spring
The pitch of the coil is the axial distance between adjacent coils in the compressed state
Q.41
Which of the following statement is wrong?
The V-belt may be operated in either direction with tight side of the belt at the top or bottom
The V-belt drive is used with large center distance
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
The ratio of driving tensions in V-belt drive is more than flat belt drives
Q.42
Which of the following statement is wrong?
The pitch of rivets is obtained by equating the tearing resistance of the plate to the shearing resistance of the rivets
The pitch of rivets should not be less than 2d, where d is the diameter of rivet hole
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
According to I.B.R., the thickness of butt strap shall not be less than 5 mm
Q.43
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
5 N-m
7 N-m
10 N-m
15 N-m
Q.44
A steel containing up to 0.15% carbon is known as
Mild steel
Dead mild steel
Medium carbon steel
High carbon steel
Q.45
Which of the following statement is wrong?
A key is used as a temporary fastening
A key is subjected to tensile stresses
A key is always inserted parallel to the axis of the shaft
A key prevents relative motion between the shaft and boss of the pulley
Q.46
A steel containing 0.8% carbon is known as
Eutectoid steel
Hypereutectoid steel
Hypo-eutectoid steel
None of these
Q.47
The rocker arms in internal combustion engines are of__________.
First type levers
Second type levers
Third type levers
None of these
Q.48
Gears are casted by
Sand mould casting
Slush casting
Permanent mould casting
Centrifugal casting
Q.49
Which of the following is an anti-friction bearing?
Journal bearing
Pedestal bearing
Collar bearing
Needle bearing
Q.50
The anti-friction bearings
Have low starting and low running friction at moderate speeds
Have high initial cost
Can carry both radial and thrust loads
All of these
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