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
Answer
Correct Answer:
M6 - 8d
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Stress concentration is caused due to
Answer
Correct Answer:
All of the above
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In the levers of the first type, the mechanical advantage is ________ one.
Answer
Correct Answer:
More than
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Wahl's stress factor __________ very rapidly as the spring index decreases.
Answer
Correct Answer:
Increases
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In Vickers hardness testing, the pyramid indenter apex is
Answer
Correct Answer:
136°
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When a machine member is subjected to torsion, the torsional shear stress set up in the member is
Answer
Correct Answer:
Zero at the centroidal axis and maximum at the outer surface of the member
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The suitable material for belt used in flour mill is
Answer
Correct Answer:
Canvas or cotton duck
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According to Indian standard specifications, 100 H6/g5 means that
Answer
Correct Answer:
Tolerance grade for the hole is 6 and for the shaft is 5
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The longitudinal joint in boilers is used to get the required
Answer
Correct Answer:
Diameter of boiler
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The face angle of a bevel gear is equal to
Answer
Correct Answer:
Pitch angle + addendum angle
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The root angle of a bevel gear is equal to
Answer
Correct Answer:
Pitch angle - dedendum angle
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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
Answer
Correct Answer:
Buttress threads
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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
Answer
Correct Answer:
2136 N-m
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The buckling load will be maximum for a column, if
Answer
Correct Answer:
Both ends of the column are clamped
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The yield point in static loading is __________ as compared to fatigue loading.
Answer
Correct Answer:
Higher
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In designing thick cylinders, the equation used is
Answer
Correct Answer:
All of these
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A double strap butt joint (with equal straps) is
Answer
Correct Answer:
Always in double shear
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The valve rod in a steam engine is connected to an eccentric rod by
Answer
Correct Answer:
Knuckle joint
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The groove angle of the pulley for rope drive is usually
Answer
Correct Answer:
45°
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Which one of the following loading is considered for the design of axles?
Answer
Correct Answer:
Bending moment only
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The coefficient of friction between the belt and pulley depends upon the
Answer
Correct Answer:
All of these
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In a horizontal flat belt drive, it is customary to use
Answer
Correct Answer:
Top side of belt as slack side
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The shearing stresses in the inner face as compared to outer face of the wire in a heavy close coiled spring is
Answer
Correct Answer:
Larger
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The size of a cam depends upon
Answer
Correct Answer:
Base circle
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The objective of 'crowning' of the flat pulleys of belt drive is to
Answer
Correct Answer:
Prevent the belt from running off the pulley
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The objective of idler pulley in belt drive is to
Answer
Correct Answer:
All the above objectives
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When the shaft rotates in anticlockwise direction at high speed in a bearing, it will
Answer
Correct Answer:
Move towards right of the bearing making no metal to metal contact
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When the shaft rotates in anticlockwise direction at slow speed in a bearing, it will
Answer
Correct Answer:
Move towards left of the bearing making metal to metal contact
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When the bearing is subjected to large fluctuations of load and heavy impacts, the bearing characteristic number should be _________ the bearing modulus.
Answer
Correct Answer:
15 times
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A V-belt designated as B 4430 LP has
Answer
Correct Answer:
4430 mm as nominal pitch length
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In a flange coupling, the bolts are subjected to
Answer
Correct Answer:
Shear stress
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Transverse fillet welded joints are designed for
Answer
Correct Answer:
Tensile strength
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The edges of the plates for cylindrical vessels are usually bevelled to an angle of 80° for
Answer
Correct Answer:
Fullering and caulking
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In a boundary lubricated bearing, there is a __________ of lubricant between the journal and the bearing.
Answer
Correct Answer:
Thin film
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In a gear, having Involute teeth, the normal to the Involute is a tangent to the
Answer
Correct Answer:
Base circle
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The bending stress in a curved beam is
Answer
Correct Answer:
Zero at the point other than centroidal axis
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The rated life of a bearing varies
Answer
Correct Answer:
Inversely as cube of load
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A cotter joint is used to connect two __________ rods.
Answer
Correct Answer:
Co-axial
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Which of the following line is the safest?
Answer
Correct Answer:
Soderberg line
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Which of the following forms of thread can transmit power in only one direction?
Answer
Correct Answer:
Buttress threads
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Which of the following bearings cannot take radial loads?
Answer
Correct Answer:
Thrust ball bearing
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Which of the following coupling consists of only sleeve and a key?
Answer
Correct Answer:
Muff coupling
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Which of the following mechanical devices transfers or multiplies load with an application of small effort?
Answer
Correct Answer:
Levers
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Which of the following is not true for a good coupling?
Answer
Correct Answer:
If there is small misalignment between the shafts, the coupling cannot transmit power
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Which of the following materials are subjected to the most severe stress concentration?
Answer
Correct Answer:
Brittle materials under static and fluctuating load
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Which of the following is not the function of a spring?
Answer
Correct Answer:
They are used to measure displacement
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Which of the following is not a type of sunk key?
Answer
Correct Answer:
Hollow saddle key
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Which of the following is not the method to reduce stress concentration?
Answer
Correct Answer:
Usage of sharp corners
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Which of the following shaft are the integrals or equally spaced lines made on a shaft?
Answer
Correct Answer:
Spline shaft
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Which of the following straight-line joins endurance limit(Se) on the stress amplitude axis and yield strength (Syt) on the mean stress axis?
Answer
Correct Answer:
Soderberg line
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Which of the following is not the cause of stress concentration?
Answer
Correct Answer:
Point load applied on the component
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In which of the following type of lever the effort is located between the load and fulcrum?
Answer
Correct Answer:
Third type
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Which of the following is the function of rebound clips in a multi-leaf spring?
Answer
Correct Answer:
Helps to share the load from master leaf to graduated leaves
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Which of the following is not a type of welding joint?
Answer
Correct Answer:
Single strap joint
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Which of the following correctly symbolizes a fillet joint?
Answer
Correct Answer:
A right angled triangle
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Which of the following is true about the roller bearing in comparison with ball bearing?
Answer
Correct Answer:
Power lost in friction is more
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Which is not a possible type of failure in a riveted joint?
Answer
Correct Answer:
Shear failure of plate
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In machine design, which of the following is not true for rigid and flexible couplings?
Answer
Correct Answer:
Rigid couplings are expensive than flexible couplings
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Which of the following is not a type of transmission shaft?
Answer
Correct Answer:
Crankshaft
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Which of the following expression is not correct for designing a shaft according to rigidity?
Answer
Correct Answer:
L = GθT / J
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Which of the following line is the most economical?
Answer
Correct Answer:
Gerber parabola
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Which of the following joins two rotating shafts to each other?
Answer
Correct Answer:
Coupling
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Which of the following elements transfers torque and is only subjected with the bending moment?
Answer
Correct Answer:
Axle
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What is the maximum shear stress for a material of ultimate tensile strength (Sut) with keyway effect according to ASME code?
Answer
Correct Answer:
0.135 Sut
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Which of the following is a dominance of power screw?
Answer
Correct Answer:
Large load carrying capacity
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Which of the following in power screws is the correct equation for torque if the load is lowered while designing a machine? ( W: Weight in N, θ: Angle of inclination, ϕ: Friction angle)
Answer
Correct Answer:
W tan (θ – ϕ)
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The shock absorbing capacity of a bolt can be increased by
Answer
Correct Answer:
Making shank diameter equal to core diameter of thread
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When a bolt is subjected to shock loading, the resilience of the bolt should be considered in order to prevent breakage at
Answer
Correct Answer:
At the thread
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If an application calls for stresses on screw threads in one direction only, then the following type of thread would be best suited
Answer
Correct Answer:
Buttress
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The connecting rod bolts are tightened up with initial tension greater than the external load so that
Answer
Correct Answer:
The resultant load on the bolt would not be affected by the external cyclic load
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The connecting rod bolts are tightened up so that tightening stress
Answer
Correct Answer:
Approaches yield point
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The resultant axial load on a bolt depends on
Answer
Correct Answer:
(a), and above
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Allen bolts are
Answer
Correct Answer:
Provided with hexagonal depression in head
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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
Answer
Correct Answer:
0.4 times
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I.S. specifies following total number of grades of tolerances
Answer
Correct Answer:
18
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Basic hole is one
Answer
Correct Answer:
Whose lower deviation is zero
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Basic shaft is one
Answer
Correct Answer:
Whose upper deviation is zero
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If shearing stress in nut is half the tensile stress in a bolt, then nut length should be equal to
Answer
Correct Answer:
Diameter of bolt
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Whether any core is required in wire ropes
Answer
Correct Answer:
Yes
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In composite or reverse laid ropes
Answer
Correct Answer:
Wires in two adjacent strands are twisted in opposite direction
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The number of rivets in shear shall be equal to the number of rivets in crushing.
Answer
Correct Answer:
Correct
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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
Answer
Correct Answer:
Crown bevel gears
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The cam follower extensively used in air-craft engines is
Answer
Correct Answer:
Roller follower
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Screws used for power transmission should have
Answer
Correct Answer:
High efficiency
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The value of stress concentration factor depends upon
Answer
Correct Answer:
Material and geometry of the part
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An open belt drive is used when
Answer
Correct Answer:
Shafts are arranged parallel and rotate in the same directions
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The property of a material which enables it to be drawn into wires with the application of a tensile force, is called
Answer
Correct Answer:
Ductility
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In order to avoid tearing of the plate at an edge, the distance from the centre line of the rivet hole to the nearest edge of the plate should be equal to (where d = Diameter of rivet hole)
Answer
Correct Answer:
1.5 D
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The resistance to fatigue of a material is measured by
Answer
Correct Answer:
Endurance limit
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A crankshaft is a __________ shaft.
Answer
Correct Answer:
Machine
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Lewis equation in gears is used to find the
Answer
Correct Answer:
Compressive stress in bending
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Which of the following statement is correct for gears?
Answer
Correct Answer:
All of these
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A transmission shaft includes
Answer
Correct Answer:
All of these
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In a hydrodynamic lubricated bearing
Answer
Correct Answer:
There is a thick film of lubricant between the journal and the bearing
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A screw is said to be over hauling screw, if its efficiency is
Answer
Correct Answer:
More than 50%
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Circumferential joint in boilers is used to get the required length of a boiler.
Answer
Correct Answer:
True
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According to Indian standards, the diameter of rivet hole is made larger than the basic size of rivet by
Answer
Correct Answer:
2 mm for rivet diameter from 39 mm to 48 mm
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Slenderness ratio is the ratio of
Answer
Correct Answer:
Effective length of column to least radius of gyration of the column
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All stresses produced in a belt are
Answer
Correct Answer:
Tensile stresses
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In second type of levers,
Answer
Correct Answer:
Load is in between the fulcrum and effort
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