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Machine Design

Machine Design
Aircraft body is usually fabricated by

Pre-casting
Welding
Riveting
Casting

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Machine Design
A column of length l is fixed at both ends. The equivalent length of the column is

l/√2
l
2 l
l/2

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Machine Design
18/8 steel contains

18% nickel and 8% chromium
18% nickel and 8% vanadium
18% chromium and 8% nickel
18% vanadium and 8% nickel

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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.d.σt
(p - d) t.σt
p.t.σt

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Machine Design
In worm gears, the pressure angle is __________ the angle between two inclined faces in axial plane.

None of these
Twice
Half
Thrice

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Machine Design
The notch sensitivity q is expressed in terms of fatigue stress concentration factor Kf and theoretical stress concentration factor Kt as

(Kf + 1)/ (Kt + 1)
(Kf - 1)/ (Kt - 1)
(Kt + 1)/ (Kf + 1)
(Kt - 1)/ (Kf - 1)

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