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Machine Design

Machine Design
Taper usually provided on cotter is

1 in 24
1 in 5
1 in 40
1 in 10

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Machine Design
In the levers of third type, the mechanical advantage is __________ one.

More than
Less than
Equal to
None of these

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Machine Design
For a shoe brake, the equivalent coefficient of friction is equal to (where μ = Actual coefficient of friction, and θ = Semi-block angle)

4μ sinθ/(2θ + sin 2θ)
4μ sinθ/(θ + sinθ)
μ sinθ/(2θ + sin 2θ)
2μ sinθ/(θ + sinθ)

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Machine Design
Tearing resistance required to tear off the plate per pitch length is (where p = Pitch of rivets, d = Dia. of rivet hole, and σt = Permissible tensile stress for plate material)

p.t.σt
(p - d) t.σt
p.d.σt

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Machine Design
The modulus of elasticity for mild steel is approximately equal to

210 kN/mm²
80 kN/mm²
110 kN/mm²
100 kN/mm²

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Machine Design
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

2050 N-m
2100 N-m
2136 N-m
2000 N-m

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