The maximum shear stress theory is used for
A. Brittle materials
B. Ductile materials
C. Plastic materials
D. Nonferrous materials
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The maximum normal stress theory is used for
A. Plastic materials
B. Brittle materials
C. Non-ferrous materials
D. Ductile materials
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Rankine's theory is used for
A. Brittle materials
B. Ductile materials
C. Elastic materials
D. Plastic materials
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Guest's theory is used for
A. Brittle materials
B. Ductile materials
C. Elastic materials
D. Plastic materials
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In a turnbuckle, if one of the rods has left hand threads, then the other rod will have
A. Right hand threads
B. Left hand threads
C. Multiple threads
D. Pointed threads
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The gears are termed as medium velocity gears, if their peripheral velocity is
A. 1 - 3 m/s
B. 3 - 15 m/s
C. 15 - 30 m/s
D. 30 - 50 m/s
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For hardening alloy steels and high speed steels, they are heated to
A. 1100 to 1300°C
B. 1300 to 1500°C
C. 500 to 600°C
D. 700 to 900°C
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In order to avoid tearing of the plate at edge, the distance from the center line of the rivet hole to the nearest edge of the plate in terms of dia. of rivet d should be equal to
A. 1 d
B. 1.25 d
C. 1.5 d
D. 1.75 d
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If shearing stress in nut is half the tensile stress in a bolt, then nut length should be equal to
A. Diameter of bolt
B. 0.75 × diameter of bolt
C. 1.25 × diameter of bolt
D. 1.5 × diameter of bolt
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The maximum stress due to stress concentration in a bar having circular transverse hole, as compared to its static stress without hole will be
A. Same in both cases
B. 2 times more
C. 3 times more
D. 4 times more
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The largest diameter of an external or internal screw thread is known as
A. Minor diameter
B. Major diameter
C. Pitch diameter
D. None of these
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The smallest diameter of an external or internal screw thread is known as
A. Minor diameter
B. Major diameter
C. Pitch diameter
D. None of these
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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 τ u = Ultimate shear strength of the material of the plate)
A. dt τ u
B. π dt τ u
C. 4 π × d 2 τ u
D. 4 π × d 2 × t τ u
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The algebraic difference between the maximum limit and the basic size is called
A. Lower deviation
B. Upper deviation
C. Actual deviation
D. Mean deviation
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Which of the following spring is used in mechanical wrist watch?
A. Helical compression spring
B. Spiral spring
C. Torsion spring
D. Belleville spring
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The elasticity is the property of a material which enables it to
A. Regains its original shape after deformation when the external forces are removed
B. Draw into wires by the application of a tensile force
C. Resists fracture due to high impact loads
D. Retain deformation produced under load permanently
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The plasticity is the property of a material which enables it to
A. Regain its original shape after deformation when the external forces are removed
B. Draw into wires by the application of a tensile force
C. Resist fracture due to high impact loads
D. Retain deformation produced under load permanently
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Taper usually provided on cotter is
A. 1 in 5
B. 1 in 10
C. 1 in 24
D. 1 in 40
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The included angle between the sides of V-belt is
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The width of the pulley should be __________ width of the belt.
A. Equal to
B. Less than
C. Greater than
D. None of these
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