Description : The shafts are designed on the basis of a. strength and rigidity. b. ductility. c. malleablility. d. resilience.
Last Answer : a. strength and rigidity.
Description : The shafts will have same strength on the basis of torsional rigidity, if (a) diameter and length of both shafts is same (b) material of both shafts is same (c) angle of twist for both shafts is same (d) all of above conditions are satisfied
Last Answer : (d) all of above conditions are satisfied
Description : Which of the following is incorrect? a. In torsion equation, we use mean torque b. In torsion equation, we use maximum torque c. Many shafts are designed under combined bending and torsion load d. Shafts are also designed for torsional rigidity
Last Answer : a. In torsion equation, we use mean torque
Description : Flexible shafts have ______ rigidity in bending moment. a) High b) Low c) Very high d) Extremely low
Last Answer : b) Low
Description : Flexible shafts have ___ rigidity in torsion making them flexible. a) Low b) High c) Very high d) Infinitely small
Last Answer : b) High
Description : The shafts will have same strength on the basis of torsional rigidity, if (A) Diameter and length of both shafts is same (B) Material of both shafts is same (C) Angle of twist for both shafts is same (D) All of above conditions are satisfied
Last Answer : (D) All of above conditions are satisfied
Description : Two shafts will have equal strength, if (a) diameter of both the shafts is same (b) angle of twist of both the shafts is same (c) material of both the shafts is same (d) twisting moment of both the shafts is same
Last Answer : d) twisting moment of both the shafts is same
Description : For same weight, same material, same length a. Solid shaft is always stronger than a hollow shaft b. Solid shaft is always weaker than a hollow shaft and strength ratio will depend upon Do/Di of ... of a solid shaft is always weaker and the strength ratio will depend upon Do/Di of hollow shaft
Last Answer : b. Solid shaft is always weaker than a hollow shaft and strength ratio will depend upon Do/Di of hollow shaft
Description : A transmission shaft subjected to bending loads must be designed on the basis of (a) maximum normal stress theory (b) maximum shear stress theory (c) maximum normal stress and maximum shear stress theories (d) fatigue strength
Last Answer : (a) maximum normal stress theory
Description : A hollow shaft of 1 m length is designed to transmit a power of 30 kW at 700 rpm. The maximum permissible angle of twist in the shaft is 1o. The inner diameter of the shaft is 0.7 times the outer diameter. The modulus of ... shaft is _______. (a) 43 to 45 (b) 50to 60 (c) 70 to 80 (d) 85 to 100
Last Answer : (a) 43 to 45
Description : Calculate the shaft diameter on rigidity basis if torsional moment is 196000N-mm, length of shaft is 1000mm. Permissible angle of twist per meter is 0.5’ and take G=79300N/mm². a) None of the listed b) 41.2mm c) 35.8mm d) 38.8mm
Last Answer : b) 41.2mm
Description : While designing shaft on the basis of torsional rigidity, angle of twist is given by? a) 100Ml/Gd⁴ b) 584Ml/Gd⁴ c) 292 Ml/Gd⁴ d) 300 Ml/Gd⁴
Last Answer : b) 584Ml/Gd⁴
Description : Two shafts in torsion will have equal strength if a. Only diameter of the shafts is same b. Only angle of twist of the shaft is same c. Only material of the shaft is same d. Only torque transmitting capacity of the shaft is same
Last Answer : d. Only torque transmitting capacity of the shaft is same
Description : Strength of a shaft a. Is equal to maximum shear stress in the shaft at the time of elastic failure b. Is equal to maximum shear stress in the shaft at the time of rupture c. Is equal to torsional rigidity d. Is ability to resist maximum twisting moment
Last Answer : d. Is ability to resist maximum twisting moment
Description : A shaft is designed for (a) Strength alone (b) Stiffness alone (c) Both for strength and stiffness (d) None
Last Answer : (c) Both for strength and stiffness
Description : The ratio of strengths of solid to hollow shafts, both having outside diameter D and hollow having inside diameter D/2, in torsion, is a.1/4 b. 1/2 c. 1/16 d. 15/16
Last Answer : d. 15/16
Description : Which of the following act on shafts? a) Torsional moment b) Bending Moment c) Both torsional and bending d) None of the mentioned
Last Answer : c) Both torsional and bending
Description : eaf springs are designed on the basis of (a) Maximum bending stresses (b) Maximum deflection (c) Maximum bending as well as maximum deflection (d) None
Last Answer : (c) Maximum bending as well as maximum deflection
Description : A open helical spring under axial torque is designed on the basis of (a) Shear (b) Compression (c) Bending (d) None
Last Answer : d) None
Description : A closed helical spring under axial torque is designed on the basis of (a) Shear (b) Compression (c) Bending (d) None
Last Answer : (c) Bending
Description : A closed helical spring under axial load is designed on the basis of (a) Shear (b) Compression (c) Bending (d) None
Last Answer : (a) Shear
Description : A carriage spring is designed on the basis of (a) Shear (b) Compression (c) Bending (d) None
Description : A beam is designed on the basis of a. Maximum bending moment b. Minimum shear force. c.Maximum bending moment as well as for maximum shear force d. None.
Last Answer : c.Maximum bending moment as well as for maximum shear force
Description : A beam is designed on the basis of a. Maximum deflection. b.Minimum deflection c.Maximum slope d.None.
Last Answer : a. Maximum deflection.
Description : A power transmitting ductile material shaft under P, T and M will be designed on the basis of (a) Rankine theory (b) Guest Theory (c) Haigh theory (d) None
Last Answer : (b) Guest Theory
Description : A spring is designed for (a) Higher strength (b) Higher deflection (c) Higher stiffness (d) None
Last Answer : (b) Higher deflection
Description : Actual stress in the bolts of a flanged coupling of a shaft will be (a) More than the designed strength (b) Less than the designed strength (c) Neither more nor less than the designed strength (d) None
Last Answer : (b) Less than the designed strength
Description : In shafts with keyways the allowable stresses are usually ------------ proportional to the twisting moment. a.25% b. 50% c. 75% d. 95%
Last Answer : c. 75%
Description : Solid shafts are used in epicyclic gearboxes. a) True b) False
Last Answer : b) False
Description : The design of shafts made of brittle materials is based on (a) Guest’s theory (b) Rankine’s theory (c) St. Venant’s theory (d) Von Mises Theory
Last Answer : (b) Rankine’s theory
Description : Two shafts A and B are made of the same material. The diameter of the shaft A is twice as that of shaft B. The power transmitted by the shaft A will be ........... of shaft B. (a) twice (b) four times (c) eight times (d) sixteen times
Last Answer : (c) eight times
Description : It is a secondary shaft used to counter the direction of main shaft. 81. Shafts are subjected to ______ forces. a) Compressive b) Tensile c) Shear d) twisting
Last Answer : b) Tensile
Description : -For two shafts in parallel or for two concentric shafts a. T = T1 + T2 b. T = T1 = T2 c. T = T1 – T2 d. T = (T1.T2)^1/2
Last Answer : a. T = T1 + T2
Description : For two shafts in series or having different diameters for two parts of length a. T = T1 + T2 b. T = T1 = T2 c. T = T1 – T2 d. T = (T1.T2)^1/2
Last Answer : b. T = T1 = T2
Description : For same length, same material, same length a. Weight of solid shaft is less than weight of hollow shaft b. Weight of solid shaft is more than weight of hollow shaft c. Weight of hollow and solid shafts will be same d. Sometime more sometime less
Last Answer : b. Weight of solid shaft is more than weight of hollow shaft
Description : The following option is correct a. There is neither advantage nor disadvantage in transmitting power at high speed b. There is advantage in transmitting power at high speeds c. There is ... There is advantage in transmitting power at high speed provided shafts are made of high speed steel
Last Answer : b. There is advantage in transmitting power at high speeds
Description : The shafts are made of a. mild steel b. alloy steel c. copper alloys d. cast iron.
Last Answer : d. cast iron.
Description : For two shafts joined in parallel, the --------------- in each shaft is same. a. shear stress. b. Angle of twist c. torque d. torsional stress.
Last Answer : b. Angle of twist
Description : For two shafts joined in series, the --------------- in each shaft is same. a. shear stress. b. Angle of twist c. torque d. torsional stress.
Last Answer : c. torque
Description : Ratio of diameters of two shafts joined in series is 2. If the two shafts have the same material and the same length the ratio of their shear stresses is a. 2 b. 4 c. 8 d. 16
Last Answer : c. 8
Description : Ratio of diameters of two shafts joined in series is 2. If the two shafts have the same material and the same length the ratio of their angles of twist is a. 2 b. 4 c. 8 d. 16
Last Answer : d. 16
Description : The relation governing the torsional torque in circular shafts is a. T/r=τ/l=Gθ/J b. T/J=τ/r=Gθ/l c. T/J=τ/l=Gθ/r d. T/l=τ/r=Gθ/J
Last Answer : b. T/J=τ/r=Gθ/l
Description : Spiral spring is quite rigid. (a) Yes (b) No it is flexible (c) It is of moderate rigidity (d) Rigidity can’t be determined
Last Answer : (b) No it is flexible
Description : The load required to produce a unit deflection in the spring is called (a) Modulus of Rigidity (b) Spring stiffness (c) Flexural rigidity (d) Tensional rigidity
Last Answer : b) Spring stiffness
Description : Find total number coils in a spring having square and ground ends. Deflection in the spring is 6mm when load of 1100N is applied. Modulus of rigidity is 81370N/mm². Wire diameter and pitch circle diameter are 10mm and 50mm respectively. a) 7 b) 6 c) 5 d) 4
Last Answer : a) 7
Description : Determine number of coils in a helical compression spring, if modulus of rigidity is 80 Gpa and spring stiffness is 50 N/ mm. Assume wire diameter and spring index as 8 mm and 5 respectively a. 11.8 turns b. 12.8 turns c. 13.3 turns d. None of the above
Last Answer : b. 12.8 turns
Last Answer : (b) Spring stiffness
Description : In the theorem of three moments in the most general form a.two flexural rigidity are considered b. only one flexural rigidity is considered c.no flexural rigidity is considered d.flexural rigidity is doubled
Last Answer : a.two flexural rigidity are considered
Description : A simply supported beam carries uniformly distributed load of 20 kN/m over the length of 5 m. If flexural rigidity is 30000 kN.m2, what is the maximum deflection in the beam? a. 5.4 mm b. 1.08 mm c. 6.2 mm d. 8.6 mm
Last Answer : a. 5.4 mm
Description : A circular shaft subjected to torsion undergoes a twist of 10in a length of 120 cm. If the maximum shear stress induced is limited to 1000 kg/cm2and if modulus of rigidity G = 0.8 x 106then the radius of the shaft should be (a) p/8 (b) p/27 (c) 18/p (d) 27/p
Last Answer : (d) 27/p