Related Questions
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4
In an oil lubricated journal bearing, the coefficient of friction between the journal and the bearing
A. Remains constant at all speeds
B. Is minimum at zero speed and increases monotonically with increase in speed
C. Is maximum at zero speed and decreases monotonically with increase in speed
D. Becomes minimum at an optimum speed and then increases with further increase in speed
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4
Stress concentration is caused due to
A. Variation in properties of material from point to point in a member
B. Pitting at points or areas at which loads on a member are applied
C. Abrupt change of section
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4
A steel containing upto 0.15% carbon is known as
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4
The cold working of metals is carried out __________ the recrystallisation temperature.
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4
A key capable of tilting in a recess milled out in a shaft is known as
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4
The radial distance of a tooth from the pitch circle to the top of the tooth is called
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4
Rankine's theory is used for
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4
The material used for brake lining should have __________ coefficient of friction.
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4
The pipe joint mostly used for pipes carrying water at low pressures is
D. Spigot and socket joint
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4
A circular shaft can transmit a torque of 5 kN-m. If the torque is reduced to 4 kN-m, then the maximum value of bending moment that can be applied to the shaft is
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4
When a hole of diameter d is punched in a metal of thickness 't', then the force required to punch a hole is equal to (where τu = Ultimate shear strength of the material of the plate)
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4
Which one of the following is a positive drive?
C. Crossed flat belt drive
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4
When the belt is transmitting maximum power, the belt speed should be
D. √(3m /Pmax) Where m = mass of belt per metre (kg/m) Pmax = maximum permissible tension in belt (N)
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4
If a spring is cut down into two springs, the stiffness of cut springs will be
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4
The most important dimension in the design of a nut is
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The shock absorbing capacity of a bolt may be increased by
A. Increasing its shank diameter
B. Decreasing its shank diameter
C. Tightening the bolt properly
D. Making the shank diameter equal to core diameter of thread
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4
A spring is used to
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4
Stress concentration is caused due to
A. Variations in load acting on a member
B. Variations in properties of materials in a member
C. Abrupt change of cross-section
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4
Spring stiffness is
A. Ratio of coil diameter to wire diameter
B. Load required to produce unit deflection
C. Its capability of storing energy
D. Its ability to absorb shocks
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4
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)
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4
The temperature at which the new grains are formed in the metal is known as
A. Lower critical temperature
B. Upper critical temperature
C. Recrystallisation temperature
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4
For unequal width of butt straps, the thicknesses of butt straps are
A. 0.75 t for narrow strap on the inside and 0.625 t for wide strap on the outside
B. 0.75 t for wide strap on the inside and 0.625 t for narrow strap on the outside
C. 0.75 t for both the straps on the inside and outside
D. 0.625 t for both the straps on the inside and outside
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4
Soderberg relation is based on __________ of the material whereas all other failure relation for dynamic loading are based on ultimate strength of the material.
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4
The ratio of endurance limit in shear to the endurance limit in flexure is
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4
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
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4
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
A. Equating tearing resistance of the plate to the shearing resistance of the rivets
B. Equating tearing resistance of the plate to the crushing resistance of the rivets
C. Equating shearing resistance to the crushing resistance of the rivets
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4
In worm gears, the angle between the tangent to the pitch helix and an element of the cylinder, is known as
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4
The permissible stress for carbon steel under static loading is generally taken as
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4
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
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4
According to I.B.R., the efficiency of a triple riveted butt joint with double straps of unequal width (5 rivets per pitch length) should be