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Quiz 11
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Q.1
The maximum efficiency of a square threaded screw is
(1 - sinφ)/ (1 + sinφ)
(1 + sinφ)/ (1 - sinφ)
(1 - sinφ)/ (1 + cosφ)
(1 + cosφ)/ (1 - sinφ)
Q.2
In order to have a connecting rod equally strong in buckling about X-axis and Y-axis, the moment of inertia about X-axis should be __________ the moment of inertia about Y-axis.
Equal to
Twice
Three times
Four times
Q.3
In a marine flange coupling, the thickness of flange is taken as
d/2
d/3
3d/4
d/4
Q.4
In a full journal bearing, the angle of contact of the bearing with the journal is
120°
180°
270°
360°
Q.5
If a bearing is designated by the number 305, it means that the bearing is of
Medium series whose bore is 5 mm
Medium series whose bore is 25 mm
Light series whose bore is 25 mm
Light series whose bore is 5 mm
Q.6
When bevel gears connect two shafts whose axes intersect at an angle greater than a right angle and one of the bevel gears has a pitch angle of 90°, then they are known as
Crown bevel gears
Angular bevel gears
Mitre gears
Internal bevel gears
Q.7
The connecting rod bolts are tightened up so that tightening stress
Is just sufficient to hold parts together
Approaches yield point
Is 50% of yield point
Is about yield point divided by safety factor
Q.8
In a flat belt drive, if the slip between the driver and belt is 1 %, between the belt and follower is 3% and driver and follower pulley diameters are equal, then velocity ratio of the drive will be
0.96
0.97
0.98
0.99
Q.9
The static tooth load should be __________ the dynamic load.
Equal to
Less than
Greater than
None of these
Q.10
The wear load should be __________ the dynamic load.
Equal to
Less than
Greater than
None of these
Q.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)
Less than 20d
Greater than 30d
Between 20d and 30d
Equal to inside diameter of pipe
Q.12
The diameter of the rivet hole is usually __________ the nominal diameter of the rivet.
Equal to
Less than
More than
None of these
Q.13
In designing a flange coupling, the pitch circle diameter of bolts is taken as (where d = Diameter of the shaft)
2 d
3 d
4 d
5 d
Q.14
In designing a sleeve coupling, length of the sleeve is taken as (where d = Diameter of the shaft)
d + 17 mm
2d + 13 mm
2d + 20 mm
3.5 d
Q.15
For a square key made of mild steel, the shear and crushing strength are related as
Shear strength is equal to crushing strength
Shear strength is greater than crushing strength
Shear strength is less than crushing strength
None of the above
Q.16
The dynamic tooth load is due to
Inaccuracies of tooth spacing
Irregularities in tooth profiles
Deflections of teeth under load
All of these
Q.17
In designing a sleeve coupling, outer diameter of the sleeve is taken as (where d = Diameter of the shaft)
d + 17 mm
2d + 13 mm
2d + 20 mm
3.5d
Q.18
When the material of key and shaft is same, and the width of key is one-fourth of the diameter of shaft (d), then length of key will be
0.8 d
1.2 d
1.57 d
1.8 d
Q.19
The permissible stress in the fillet weld is 100 N/mm². The fillet weld has equal leg lengths of 15 mm each. The allowable shearing load on the weldment per cm length of the weld is
7.5 kN
10.6 kN
15 kN
22.5 kN
Q.20
A shaft is subjected to
Bending stresses
Shear stresses
Combined bending and shear stresses
All of these
Q.21
When the belt speed increases
Power transmitted increases
Power transmitted decreases
Power transmitted increases to a maximum value and then decreases
Power transmitted remains the same
Q.22
In a partial journal bearing, the angle of contact of the bearing with the journal is
120°
180°
270°
360°
Q.23
If a spring is cut down into two springs, the stiffness of cut springs will be
Half
Same
Double
None of the above
Q.24
In worm, gears, pitch lead angle is
Half the angle between two inclined faces in axial plane
The angle between the tangent to the pitch helix and the plane of rotation
The angle between the tangent to the pitch helix and an element of the cylinder
None of the above
Q.25
In helical bevel gearing, the axes of shafts are __________ and the teeth are curved.
Intersecting
Non-intersecting and non-parallel
Intersecting and non-parallel
None of these
Q.26
A spring is used to
Measure forces
Apply forces
Store energy
All of these
Q.27
Which of the following property is essential for spring materials?
Stiffness
Ductility
Resilience
Plasticity
Q.28
In case of thick cylinders, the tangential stress across the thickness of cylinder is
Maximum at the outer surface and minimum at the inner surface
Maximum at the inner surface and minimum at the outer surface
Maximum at the inner surface and zero at the outer surface
Maximum at the outer surface and zero at the inner surface
Q.29
The ball bearings are, usually, made from
Low carbon steel
High carbon steel
Medium carbon steel
High speed steel
Q.30
When the pulley or other mating piece is required to slide along the shaft, a __________ sunk key is used.
Rectangular
Square
Parallel
None of these
Q.31
When carbon in the cast iron is principally in the form of graphite, the cast iron will be of
Brown colour
Yellow colour
White colour
Grey colour
Q.32
Screws used for power transmission should have
Very fine threads
High efficiency
Low efficiency
Strong teeth
Q.33
Yield point in fatigue loading as compared to static loading is
Same
Higher
Lower
Depends on other factors
Q.34
The arms of the pulleys for flat belt drive have
Elliptical cross-section
Major axis in plane of rotation
Major axis twice the minor axis
All the three characteristics
Q.35
When a bolt is subjected to shock loading, the resilience of the bolt should be considered in order to prevent breakage at the
Thread
Middle
Shank
Head
Q.36
In order to determine the stresses in a thin cylinder due to an internal pressure, it is assumed that
The effect of curvature of the cylinder wall is neglected
The tensile stresses are uniformly distributed over the section of the walls
The effect of the restraining action of the heads at the end of the pressure vessel is neglected
All of the above
Q.37
A rivet is specified by
Shank diameter
Length of rivet
Type of head
Length of tail
Q.38
A shaft coupling should
Be easy to connect or disconnect
Transmit full power of the shaft
Hold the shafts in perfect alignment
All of these
Q.39
Which is correct statement? Stress concentration in static loading is
Very serious in brittle materials and less serious in ductile materials
Very serious in ductile materials and less serious in brittle materials
Equally serious in both types of materials
Seriousness would depend on other factors
Q.40
When two helical springs of equal lengths are arranged to form a cluster spring, then
Shear stress in each spring will be equal
Load taken by each spring will be half the total load
Only A is correct
Both A and B is correct
Q.41
Resilience of a material is important, when it is subjected to
Combined loading
Fatigue
Thermal stresses
Shock loading
Q.42
In testing a material for endurance strength, it is subjected to
Static load
Dynamic load
Impact load
Completely reversed load
Q.43
If two springs are in parallel then their overall stiffness will be
Half
Same
Double
None of the above
Q.44
When two springs are in series (having stiffness K), the equivalent stiffness will be
K
K/2
2K
K/4
Q.45
A thin spherical shell of internal diameter d is subjected to an internal pressure p. If σt is the tensile stress for the shell material, then thickness of shell is equal to
pd/σt
pd/2σt
pd/3σt
pd/4σt
Q.46
The tension on the slack side of the belt is __________ the tension on the tight side of the belt.
Equal to
Less than
Greater than
None of these
Q.47
In order to remove internal stresses produced by hardening the steel, the process usually adopted is
Tempering
Normalizing
Annealing
Spheroidizing
Q.48
When the belt is transmitting maximum power, the belt speed should be
(Where, m = mass of belt per meter (kg/m) and Pmax = maximum permissible tension in belt (N))
√(Pmax / 2m)
√(Pmax / 3m)
√(Pmax / m)
√(3m /Pmax)
Q.49
In order to have smooth operation, the minimum number of teeth on the smaller sprocket, for moderate speeds, should be
15
17
21
25
Q.50
Spring index is
Ratio of coil diameter to wire diameter
Load required to produce unit deflection
Its capability of storing energy
Indication of quality of spring
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