Q.no 51. If allowable shear stress in the shaft is 48MPa and torsional moments is 254 kNm, find the diameter of the shaft.
A : 300 mm
B : 200 mm
C : 400 mm
D : 250 mm
Q.no 52. Find the shear stress in the spring wire used to design a helical compression sprig if a load of 1200N is applied on the spring. Spring index is 6, and wire diameter 7mm.
A : 452.2N/mm²
B : 468.6N/mm²
C : 512.2N/mm²
D : None of the listed
Q.no 53. A right angled bell-crank lever is to be designed to raise a load of 5 kN by applying 3kN Effort. Determine the reaction force acting on fulcrum
A : 8kN
B : 5.83kN
C : 1.66kN
D : 15kN
Q.no 54. A railway wagon moving with a speed of 1.5m/s is brought to rest by bumper consisting of two springs. Mass of wagon is 100kg. The springs are compressed by 125mm. Calculate the maximum force acting on each spring.
A : 1200N
B : 1500N
C : 1800N
D : 2000N
Q.no 55. What is the output from differential screws when pitch of the two screws is 12mm and 8mm? Also the nut is rotated by applying a force of 120N at a radius of 300mm and the two screws remain stationary. The torque of raising and lowering for the two screws is 5k N mm and 2.5k N-mm where k is the effective axial weight on the screw.
A : 13200 N-mm
B : 15200 N-mm
C : 19200 N-mm
D : 17200 N-mm
Q.no 56. Find the mean coil diameter of a helical compression sprig if a load of 1200N is applied on the spring. Spring index is 6, and wire diameter 7mm.
A : 7/6mm
B : 42mm
C : 1200×6/7 mm
D : None of the listed
Q.no 57. If shaft diameter is 40mm, calculate the diameter of hub in flange coupling.
A : 100
B : 120
C : 80
D : 60
Q.no 58. Two close-coiled helical springs are equal in all respects except the number of turns. If the number of turns are in the ratio of 2:3, then the stiffness of the spring will be in the ratio of
A : 08541666666666665
B : 0.1729166666666667
C : 0.12638888888888888
D : 0.37777777777777777
Q.no 59. Two spring having stiffness constants of 22N/mm and 25N/mm are connected in parallel. They are to be replaced by a single spring to have same effect. The stiffness of that spring will be?
A : None of the mentioned
B : 3N/mm
C : 47N/mm
D : 11.7N/mm
Q.no 60. A weighing machine consists of a 2 kg pan resting on a spring in this condition, with the pan resting on the spring, the length of the spring is 200 mm. When a mass of 20 kg is placed on the pan, the length of the spring becomes 100 mm. For the spring, the un-deformed length L and the spring constant K (stiffness) are
A : L=200mm, 1862N/m
B : L=200mm, 1960N/m
C : L=200mm, 19860N/m
D : L=200mm, 2156N/m
Answer for Question No 51. is a
Answer for Question No 52. is a
Answer for Question No 53. is b
Answer for Question No 54. is a
Answer for Question No 55. is c
Answer for Question No 56. is b
Answer for Question No 57. is c
Answer for Question No 58. is c
Answer for Question No 59. is c
Answer for Question No 60. is b
Leave a comment