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Machine Design

Machine Design
The groove angle of pulleys for V-belt is

More than 400
340 to 360
300 to 320
420 to 450

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Machine Design
Applications in which stresses are encountered in one direction only uses following type of threads

Buttress
Acme
Metric
Square

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Machine Design
The efficiency of a square threaded screw is maximum if the helix angle is equal to(Where φ = Angle of friction)

45° - φ
90° - φ
45° - φ/2
45° + φ/2

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Machine Design
In a steam engine, the piston rod is usually connected to the cross-head by means of a

Cotter joint
Oldham coupling
Knuckle joint
Universal joint

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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

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

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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

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

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