Description : The torque transmitted by a hollow shaft of outer diameter (D) and inner diameter (d) (a)π/4fs(D2-d2)/D (b) π/4fs(D3-d3)/D (c) π/4fs(D4-d4)/D (d) π/4fs(D4-d4)/D
Last Answer : (c) π/4fs(D4-d4)/D
Description : A hollow prismatic beam of circular section is subjected to a torsional moment. The maximum shear stress occurs at (a) inner wall of cross section (b) middle of thickness (c) outer surface of shaft (d) none of these
Last Answer : (c) outer surface of shaft
Description : For a solid or a hollow shaft subject to a twisting moment T, the torsional shearing stress t at a distance r from the centre will be (a) t = Tr/J (b) t = Tr (c) t = TJ/r (d) none of these
Last Answer : (a) t = Tr/J
Description : Maximum shear stress in a hollow shaft subjected to a torsional moment is at the a. Middle of thickness. b. At the inner surface of the shaft. c. At the outer surface of the shaft. d. At the middle surface of the shaft.
Last Answer : c. At the outer surface of the shaft.
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 : Strain energy in a close coiled helical spring is (a) τ2/8G (b) τ2/16G (c) τ2/4G (d) None
Last Answer : (c) τ2/4G
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 : When the shaft is subjected to pure torsional moment, the torsional stress is given by? a) None of the listed b) 32M/πdᵌ c) 16M/πdᵌ d) 8M/πdᵌ
Last Answer : c) 16M/πdᵌ
Description : Torsional rigidity of a shaft is given by a. Gl/θ b. Tθ c. Tl/θ d. T/l
Last Answer : c. Tl/θ
Description : For the same material, length and given torque, a hollow shaft weighs……………… a solid shaft. (a) Less than (b) More than (c) Equal to (d) None of these
Last Answer : (a) Less than
Description : The polar moment of inertia of a hollow shaft of outer diameter (D) and inner diameter (d) is given by. (a)π/16(D3-d3) (b) π/16(D4-d4) (c) π/16(D4-d4) (d) π/16(D4-d4/d)
Last Answer : (b) π/16(D4-d4)
Description : The strain energy will be higher in which shaft under the same torque (a) Solid shaft (b) Hollow shaft (c) Same in Solid as well as hollow shaft (d) None
Last Answer : (b) Hollow shaft
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 : The product of the tangential force acting on the shaft and radius of shaft known as (a) Torsional rigidity (b) Flexural rigidity (c) Bending moment (d) Twisting moment
Last Answer : (d) Twisting moment
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 said to be in pure torsion if a. Turning moment is applied at one end and other end is free b. Turning force is applied at one end and other end is free c. Two opposite turning moments are applied to the shaft d. Combination of torsional load and bending load is applied to the shaft
Last Answer : c. Two opposite turning moments are applied to the shaft
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 : Torsional rigidity of a shaft is defined as a. G/J b. GJ c. TJ d. T/J
Last Answer : a. G/J
Description : Solid shaft is ----------than hollow shaft of same weight. a) cheaper b) costlier c) not costlier d) not cheaper
Last Answer : b) costlier
Description : The strength of hollow shaft is more than the strength of solid shaft of ---------weight. a) same b) different c) equal d) not equa
Last Answer : a) same
Description : The stiffness of solid shaft is---------- than the stiffness of hollow shaft with same weight. a) less b) more c) equal d) not equal
Last Answer : b) more
Description : A hollow shaft has an inner diameter of 3.7 cm and an outer diameter of 4.0 cm. A 1 kN-m torque is applied to this shaft. What is the shear stress at the mid-radius of this shaft? (a) 117Mpa (b) 178 Mpa (c) 286 Mpa (d) 363 Mpa
Last Answer : (c) 286 Mpa
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 : From strength point of view, whether hollow or solid shaft will be preferable (a) Solid shaft (b) Hollow shaft (c) Both solid as well as hollow shaft (d) None
Last Answer : b) Hollow shaft
Description : What is the shear stress acting on the outer surface of a hollow shaft subjected to a torque of 100 Nm?(The inner and outer diameter of the shaft is 15 mm and 30 mm respectively.) a. 50.26 N/mm2 b. 40.24 N/mm2 c. 20.120 N/mm2 d. 8.74 N/mm2
Last Answer : c. 20.120 N/mm2
Description : The strength of a hollow shaft is ……… for the same length, material and weight of a solid shaft. (a) More (b) Less (c) Equal (d) None of these
Last Answer : (b) Less
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 : 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 : Which of the following is incorrect? a. In a solid shaft maximum shear stress occurs at radius = radius of shaft b. In a solid shaft maximum shear stress occurs at center c. In a hollow ... maximum shear stress occurs at outer radius d. In a hollow shaft minimum shear stress occurs at inner radius
Last Answer : b. In a solid shaft maximum shear stress occurs at center
Description : The strength of a hollow shaft for the same length, material and weight is ---------- a solid shaft. a. less than. b. more than. c. equal to. d. not equal to.
Last Answer : b. more than.
Description : The ratio of strength of a hollow shaft to that of a solid shaft subjected to torsion if both are of the same material and of the same outer diameters, the inner diameter of hollow shaft being half of the outer diameter is a. 15/16 b. 16/15 c. 7/8 d. 8/7
Last Answer : a. 15/16
Description : A solid shaft of same cross sectional area and of same material as that of a hollow shaft can resist a. Less torque. b. More torque. c. Equal torque. d. Unequal torque.
Last Answer : a. Less torque.
Description : The shear stress concentration factor (Ks) in mechanical springs is given as _____ a. (1 + 0.5 / C) b. 0.615 / C c. (1 + 0.615 / C) d. [(4C – 1) / (4C + 1)] + [0.615 / C]
Last Answer : a. (1 + 0.5 / C)
Description : In the relation ( T/J = Gθ/L = τ/ R), the letter G denotes modulus of ______ a. elasticity b. plasticity c. rigidity d. resilience
Last Answer : c. rigidity
Description : Length of open belt is given by formula a. L=[2C+( 2) (DI+D2)] + [ /4C] b. L=[2C+( 2) (DI+D2)] + [ /4C] c. L=[2C+( 2) (DI+D2)] + [ ] d. L=[2C+( 2) (DI D2)] + [ ]
Last Answer : a. L=[2C+( 2) (DI+D2)] + [ /4C]
Description : 18.The total extension of a taper rod of length ‘L’ and end diameters ‘D1’ and ‘D2’, subjected to a load (P), is given of a. 4PL/ΠE. D1D2 b. 3PL/ΠE. D1D2 c. 2PL/ΠE. D1D2 d. PL/ΠE.D1D2 Where E=Young’s modulus of elasticity
Last Answer : a. 4PL/ΠE. D1D2
Description : If the strain energy stored per unit volume in a hollow shaft subjected to a pure torque when t attains maximum shear stress fs the ratio of inner diameter to outer diameter, is 17/64 (fs/N) (A) 1/2 (B) 1/3 (C) 1/4 (D) 1/5
Last Answer : (C) 1/4
Description : What is the S.I. unit of torsional rigidity? a. Nm b. N.m2 c. Nm/ radian d. None of the above
Last Answer : b. N.m2
Description : Wahl’s stress concentration factor is (a) (4C – 1)/ (4C – 3) + 0.615/C (b) (4C – 1)/ (4C – 2) + 0.615/C (c) (4C – 1)/ (4C – 4) + 0.615/C (d) None
Last Answer : (c) (4C – 1)/ (4C – 4) + 0.615/C
Description : Wahl’s stress concentration factor is (a) [(4C—1)/(4C—4)] +0.615/C (b) [(4C—1)/(4C—4)] +0.625/C (c) [(4C—1)/(4C—4)] +0.635/C (d) None
Last Answer : a) [(4C—1)/(4C—4)] +0.615/C
Description : Spring index is (a) D – d (b) D/d (c) D2 –d2 (d) None
Last Answer : (b) D/d
Description : The type of stress induced in a closed coiled helical tension spring is a. tensile b. compressive c. torsional shear d. tensile and compressive
Last Answer : c. torsional shear
Description : 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
Last Answer : a. Shear stress concentration factor
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 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 : Which of the following relation represents torsional flexibility? a. GJ b. GL c. GJ / L d. L / GJ
Last Answer : d. L / GJ
Description : Torsional rigidity is defined as a. T/θ b. Cθ c. CIp d. = θ
Last Answer : c. CIp
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 : Power in watts in a shaft having N RPM is given by the equation (a) Power = 2π NT/60 (b) Power = 2π N T (c) Power = 2000 π N T/60 (d) None
Last Answer : (a) Power = 2π NT/60