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Quiz 3
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Q.1
Eye bolts are used for
Foundation purposes
Absorbing shock and vibrations
Transmission of power
Lifting and transportation of machines and cubicles
Q.2
When a shaft is subjected to combined twisting moment (T) and bending moment (M), then the equivalent twisting moment is equal to
(1/2) × √(M² + T²)
√(M² + T²)
(1/2) × [M + √(M² + T²)]
M + √(M² + T²)
Q.3
A transmission shaft includes
Over head shaft
Counter shaft
Line shaft
All of these
Q.4
Lewis form factor for 14½° composite and full depth involute system is (where T = Number of teeth)
0.124 - (0.684/T)
0.154 - (0.912/T)
0.175 - (0.841/T)
None of these
Q.5
The speed of the sprocket reduces as the chain pitch __________ for a given number of teeth.
Increases
Decreases
Remain same
None of these
Q.6
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
2.5
2.8
3.0
3.5
Q.7
The stiffness of a closely coiled helical spring subjected to an axial load W is equal to (where G = Modulus of rigidity, and n = Number of active coils)
Gd⁴/ 8D3n
Gd3/ 8D3n
Gd⁴/ 4D3n
Gd⁴/ 8D²n
Q.8
For longitudinal joint in boilers, the type of joint used is
Butt joint with single cover plate
Butt joint with double cover plate
Lap joint with one ring overlapping the other
Any one of the above
Q.9
The number of slots in a 25 mm castle nut is
8
6
4
2
Q.10
According to I.B.R., the thickness of the boiler shell should not be less than
7 mm
4 mm
5 mm
6 mm
Q.11
According to I.B.R., the factor of safety of riveted joint should not be less than
1
2
3
4
Q.12
According to I.B.R., the distance between the rows of rivets, for equal number of rivets in more than one row for lap joint or butt joint (chain riveting) shall not be less than
d
1.5 d
2 d
2.5 d
Q.13
The draw of cotter should not be more than
3 mm
6 mm
8 mm
12 mm
Q.14
Auto frettage is the method of
Joining thick cylinders
Calculating stresses in thick cylinders
Pre-stressing thick cylinders
Increasing the life of thick cylinders
Q.15
A feather key is generally
Loose in shaft and tight in hub
Tight in shaft and loose in hub
Tight in both shaft and hub
Loose in both shaft and hub
Q.16
In leaf springs, the longest leaf is known as
Master leaf
Lower leaf
Upper leaf
None of these
Q.17
The pipe joint mostly used for pipes carrying water at low pressures is
Socket joint
Nipple joint
Union joint
Spigot and socket joint
Q.18
Belt slip may occur due to
Heavy load
Loose belt
Driving pulley too small
All of the above
Q.19
According to Indian standards, a bolt thread of 6 mm size of coarse pitch and with allowance on the threads and normal tolerance grade is designated as
M6
M8
M6 - 8d
M8 - 6d
Q.20
A connecting rod is designed as a
Long column
Short column
Strut
All of these
Q.21
The sleeve or muff coupling is designed as a
Dun cylinder
Hollow shaft
Solid shaft
Thick cylinder
Q.22
When the fulcrum is in between the load and effort, the lever is said to be of
First type
Second type
Third type
Any one of these
Q.23
In block brakes, the ratio of shoe width to wheel diameter is taken between
0.1 and 0.25
0.25 and 0.50
0.50 and 0.75
0.75 and 1
Q.24
In Vickers hardness testing, the pyramid indentor apex is
40°
122°
136°
152°
Q.25
Wahl's stress factor __________ very rapidly as the spring index decreases.
Increases
Decreases
Remain same
None of these
Q.26
In the levers of first type, the mechanical advantage is ________ one.
Less than
Equal to
More than
None of these
Q.27
For standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in tension, if the height of nut (h) is approximately
0.4 times
0.6 times
0.7 times
0.8 times
Q.28
Stress concentration is caused due to
Variation in properties of material from point to point in a member
Pitting at points or areas at which loads on a member are applied
Abrupt change of section
All of the above
Q.29
The longitudinal joint in boilers is used to get the required
Length of boiler
Diameter of boiler
Length and diameter of boiler
Efficiency of boiler
Q.30
According to Indian standard specifications, 100 H6/g5 means that
Tolerance grade for the hole is 6 and for the shaft is 5
Tolerance grade for the shaft is 6 and for the hole is 5
Tolerance grade for the shaft is 4 to 8 and for the hole is 3 to 7
Tolerance grade for the hole is 4 to 8 and for the shaft is 3 to 7
Q.31
The usual proportion for the width of key is (where d = Diameter of shaft or diameter of hole in the hub)
d/8
d/6
d/4
d/2
Q.32
A shaft is subjected to fluctuating loads for which the normal torque (T) and bending moment (M) are 1000 N-m and 500 N-m respectively. If the combined shock and fatigue factor for bending is 1.5 and combined shock and fatigue factor for torsion is 2, then the equivalent twisting moment for the shaft is
2000 N-m
2050 N-m
2100 N-m
2136 N-m
Q.33
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
Knuckle threads
Square threads
Acme threads
Buttress threads
Q.34
The suitable material for belt used in flour mill is
Leather
Rubber
Canvas or cotton duck
Balata gum
Q.35
When a machine member is subjected to torsion, the torsional shear stress set up in the member is
Zero at both the centroidal axis and outer surface of the member
Maximum at both the centroidal axis and outer surface of the member
Zero at the centroidal axis and maximum at the outer surface of the member
Maximum at the centroidal axis and zero at the outer surface of the member
Q.36
The valve rod in a steam engine is connected to an eccentric rod by
Cotter joint
Bolted joint
Knuckle joint
Universal coupling
Q.37
A double strap butt joint (with equal straps) is
Always in single shear
Always in double shear
Either in single shear or double shear
Any one of these
Q.38
The property of a material which enables it to be drawn into wires with the application of a tensile force, is called
Plasticity
Elasticity
Ductility
Malleability
Q.39
The root angle of a bevel gear is equal to
Pitch angle - addendum angle
Pitch angle + addendum angle
Pitch angle - dedendum angle
Pitch angle + dedendum angle
Q.40
The face angle of a bevel gear is equal to
Pitch angle - addendum angle
Pitch angle + addendum angle
Pitch angle - dedendum angle
Pitch angle + dedendum angle
Q.41
In designing thick cylinders, the equation used is
Lame's equation
Birnie's equation
Clavarinos' equation
All of these
Q.42
The yield point in static loading is __________ as compared to fatigue loading.
Higher
Lower
Same
None of these
Q.43
The buckling load will be maximum for a column, if
One end of the column is clamped and the other end is free
Both ends of the column are clamped
Both ends of the column are hinged
One end of the column is hinged and the other end is free
Q.44
The coefficient of friction between the belt and pulley depends upon the
Material of belt and pulley
Slip of belt
Speed of belt
All of these
Q.45
Which one of the following loading is considered for the design of axles?
Bending moment only
Twisting moment only
Combined bending moment and twisting moments
Combined action of bending moment, twisting moment and axial thrust
Q.46
Which one of the following loading is considered for the design of axles?
Bending moment only
Twisting moment only
Combined bending moment and twisting moments
Combined action of bending moment, twisting moment and axial thrust
Q.47
A thin spherical shell of internal diameter d is subjected to an internal pressure p. If V is the storage capacity of shell, then its diameter will be
(6V/ π)1/2
(6V/ π)1/3
(6V/ π)2
(6V/ π)3
Q.48
The groove angle of the pulley for rope drive is usually
20°
35°
45°
60°
Q.49
The objective of 'crowning' of the flat pulleys of belt drive is to
Prevent the belt from running off the pulley
Increase the power transmission capacity
Increase the belt velocity
Prevent the belt joint from damaging the belt surface
Q.50
If T₁ and T₂ are the tensions on the tight and slack sides of the belt respectively, and Tc is the centrifugal tension, then initial tension in the belt is equal to
T₁ - T₂ + Tc
T₁ + T₂ + Tc
(T₁ - T₂ + Tc)/2
(T₁ + T₂ + Tc)/2
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