Related Questions
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4
Buttress threads are usually found on
C. Spindles of bench vices
D. Railway carriage couplings
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4
Coaxing is the procedure of increasing
A. Metal strength by cycling
B. Metal hardness by surface treatment
C. Metal resistance to corrosion by coating
D. Fatigue limit by overstressing the metal by successively increasing loadings
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4
The arms of the pulleys for flat belt drive have
A. Elliptical cross-section
B. Major axis in plane of rotation
C. Major axis twice the minor axis
D. All the three characteristics
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4
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
A. Increasing the length of bar
B. Decreasing the cross-sectional area of the bar
C. Decreasing the modulus of elasticity of the bar
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4
The yield point in static loading is __________ as compared to fatigue loading.
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4
Antifriction bearings are
C. Thin lubricated bearings
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4
Two shafts will have equal strength, if
A. Diameter of both the shafts is same
B. Angle of twist of both the shafts is same
C. Material of both the shafts is same
D. Twisting moment of both the shafts is same
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4
Cast iron pipes are mainly used
B. In water and sewage systems
C. In pressure lubrication systems on prime movers
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4
The circumferential and longitudinal strains in a cylindrical boiler under internal steam pressure are εc and εl respectively. The change in volume of the boiler cylinder per unit volume will be
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4
In standard taper roller bearings, the angle of taper of outer raceway is
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4
Stress concentration factor is defined as the ratio of
A. Maximum stress to the endurance limit
B. Nominal stress to the endurance limit
C. Maximum stress to the nominal stress
D. Nominal stress to the maximum stress
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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 form factor of a helical gear __________ with the increase in the helix angle.
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4
The smallest diameter of an external or internal screw thread is known as
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4
The initial tension (in newtons) in a bolt used for making a fluid tight joint like steam engine cover joints, is calculated by the relation (where d = Nominal diameter of bolt in mm)
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4
When the belt is transmitting maximum power,
A. The tension in tight side is twice the centrifugal tension
B. The tension in slack side is equal to the centrifugal tension
C. The tension in tight side is thrice the centrifugal tension
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4
The washer is generally specified by its
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4
The draw of cotter need not exceed
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4
Maximum principal stress theory is applicable for
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4
Two rigid plates are clamped by means of bolt and nut with an initial force F. After tightening, a separating force P (P < F) is applied to the lower plate, which in turn acts on the nut. The tension in the both after this is
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4
Wire ropes as compared to cotton ropes
B. Offer silent operation
C. Can withstand shock loads
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4
The pitch of threads on a Jock nut in comparison to pitch of nut is
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4
The ratio of circumferential stress to longitudinal stress in a thin cylinder subjected to an internal pressure is
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4
A compound cylinder with inner radius 50 mm and outer radius 70 mm is made by shrinking one cylinder on to the other cylinder, the junction radius is 60 mm and the junction pressure is 1.1 N/mm². The maximum hoop stress developed in the inner cylinder is
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4
The coefficient of friction in belt drive depends upon
C. Materials of belt and pulley
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4
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 steel containing __________ 0.8% carbon is known as hypoeutectoid steel.
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4
In a gear, having Involute teeth, the normal to the Involute is a tangent to the
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4
Allen bolts are
B. Designed for shock load
C. Used in aircraft application
D. Provided with hexagonal depression in head
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4
The resistance to fatigue of a material is measured by
B. Ultimate tensile strength