Q.no 31. In a flange coupling, the flanges are coupled together by means of
A : bolts and nuts
B : studs
C : headless taper bolts
D : pin
Q.no 32. When helical compression spring is cut into halves, the stiffness of the resulting spring will be
A : same
B : double
C : one-half
D : one-fourth
Q.no 33. While designing shaft on the basis of torsional rigidity, angle of twist is given by?
A : Ml/Gd⁴
B : 584Ml/Gd⁴
C : 292 Ml/Gd⁴
D : None of the mentioned
Q.no 34. Which factor is used to consider the effects of direct shear stress and torsional shear stress when curvature effect stress is not considered?
A : Shear stress concentration factor
B : Wahl shear stress concentration factor
C : Both a. and b.
D : None of the above
Q.no 35. According to ASME code, maximum allowable shear stress is taken as X% of yield strength or Y% of ultimate strength.
A : X=30 Y=18
B : X=30 Y=30
C : X=18 Y=18
D : X=18 Y=30
Q.no 36. When two concentric coil springs made of the same material, having same length and compressed equally by an axial load, the load shared by the two springs will be ……………………… to the square of the diameters of the wires of the two springs.
A : directly proportional
B : inversely proportional
C : equal to
D : equal to & greater than
Q.no 37. For a double threaded screw, what will be the tangent of helix angle if nominal diameter and pitch are 100mm and 12mm respectively?
A : 045
B : 081
C : 094
D : 023
Q.no 38. The deflection of a spring with 20 active turns under a load of 1000 N is 10 mm. The spring is made into two pieces each of 10 active coils and placed in parallel under the same load. The deflection of the system is
A : 20mm
B : 10mm
C : 5mm
D : 2.5mm
Q.no 39. A right angled bell-crank is designed to raise a load of 5kN at short arm whose length is 100mm. Also longer arm is of length 500mm. If permissible bearing pressure on pin is 10N/mm² and diameter of the 20mm, find the length of the pin.
A : 35.5 mm
B : 25.5 mm
C : 20 mm
D : 30 mm
Q.no 40. If bending stress in a screw is of magnitude 95N/mm² and torsional shear stress of magnitude 15N/mm², then what is the principal shear stress?
A : 48.7N/mm²
B : 54.3 N/mm²
C : 51.4 N/mm²
D : 49.8 N/mm²
Answer for Question No 31. is a
Answer for Question No 32. is b
Answer for Question No 33. is b
Answer for Question No 34. is a
Answer for Question No 35. is a
Answer for Question No 36. is a
Answer for Question No 37. is b
Answer for Question No 38. is d
Answer for Question No 39. is b
Answer for Question No 40. is d
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