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) 15/15
Last Answer : (D) 15/15
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 : 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 : 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 : 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 : Flexible shafts have ___ rigidity in torsion making them flexible. a) Low b) High c) Very high d) Infinitely small
Last Answer : b) High
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 : A short, hollow cast iron cylinder with a wall thickness of 1 cm is to carry a compressive load of 10 tonnes. If the working stress in compression is 800 kg/cm2, the outside diameter of the cylinder should not be less than a) 0.5cm b) 5 cm c) 2.5cm d) 4.5 cm
Last Answer : b) 5 cm
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 : 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 : 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 : 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 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 : Which of the following is not designed under torsion equation? a. Spindle b. Axle c. Low cost shaft d. Shaft with variable diameter
Last Answer : b. Axle
Description : What is the maximum shear stress induced in a solid shaft of 50 mm diameter which is subjected to both bending moment and torque of 300 kN.mm and 200 kN.mm respectively? a. 9.11 N/mm2 b. 14.69 N/mm2 c. 16.22 N/mm2 d. 20.98 N/mm2
Last Answer : b. 14.69 N/mm2
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 : Solid shafts are used in epicyclic gearboxes. a) True b) False
Last Answer : b) False
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 : The polar moment of inertia of a solid circular shaft of diameter (d) is (a)πd2/16 (b) πd3/32 (c) πd4/32 (d) πd4/64
Last Answer : (c) πd4/32
Description : Cylinder having inner diameter to wall thickness ratio less than 15 are a) Thin cylinders b) Thick Cylinders c) Moderate cylinders d) none of the above
Last Answer : b) Thick Cylinders
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 : 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 : 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 : 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 : 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 : 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 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 : 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 : 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 : Hollow shafts can be made as strong as solid shafts by making the twisting moments of both the shafts same. Shafts made by __________ have residual stresses. (A) Forging (B) Cold rolling (C) Hot rolling (D) Casting
Last Answer : (B) Cold rolling
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 : A member subjected to couple produces rotational motion about its longitudinal axis called as ________ a. torsion b. twisting moment c. both a. and b. d. bending moment
Last Answer : c. both a. and b.
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 : .The shafts are designed on the basis of (a) Rigidity (b) Strength (c) Both of these (d) Either of these
Last Answer : (c) Both of these
Description : What is the maximum principle stress induced in a solid shaft of 40 mm diameter which is subjected to both bending moment and torque of 300 kN.mm and 150 kN.mm respectively? a. 21.69 N/mm2 b. 28.1 N/mm2 c. 50.57 N/mm2 d. 52.32 N/mm2
Last Answer : c. 50.57 N/mm2
Description : The type of spring used to achieve any linear and non-linear load-deflection characteristics is (a)spiral spring (b) non-ferrous spring (c)Belleville spring (d) torsion spring
Last Answer : (c)Belleville spring
Description : The material used for making torsion bar is (a) Steel (b) Cast iron (c) High carbon steel (d) All of the above
Last Answer : (a) Steel
Description : When a close-coiled helical spring is subjected to an axial load, it is said to be under. (a) Bending (b) Shear (c) Torsion (d) Crushing
Last Answer : (c) Torsion
Description : Which of the following loading is considered for the design of axles ? (a) Bending moment only (b) Twisting moment only (c) Combined bending moment and torsion (d) Combined action of bending moment, twisting moment and axial thrust
Last Answer : (a) Bending moment only
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
Description : Which of the following assumptions are made in torsion theory? a. Shaft is perfectly straight b. Material of the shaft is heterogeneous c. Twist cannot be uniform along the length of the shaft d. Shaft is perfectly curve v
Last Answer : a. Shaft is perfectly straight b. Material of the shaft is heterogeneous
Description : A shaft a. Is always subjected to pure torsion b. Combination of M & T but no end thrust c. Combination of torque & end thrust but no bending moment d. May be subjected to a combination of M, T and end thrust
Last Answer : d. May be subjected to a combination of M, T and end thrust
Description : In combined bending and torsion equivalent bending moment is a. Me = (M^2 + T^2)^1/2 b. Me = ½(M^2 + T^2)^1/2 c. Me = M+(M^2 + T^2)^1/2 d. Me = 1/2 [M+(M^2 + T^2)^1/2]
Last Answer : d. Me = 1/2 [M+(M^2 + T^2)^1/2]
Description : Equivalent torque in combined bending and torsion is given by a. Te = (M^2 + T^2)^1/2 b. Te = ½(M^2 + T^2)^1/2 c. Te = M + T d. Te = 1/2 [M+(M^2 + T^2)^1/2]
Last Answer : a. Te = (M^2 + T^2)^1/2
Description : Which of the following is not an assumption in derivation of torsion equation? a. Circular shaft remains circular after twisting b. Plane section of the shaft remain plane after twisting c. Material of shaft is isotropic d. Angle of twist is proportional to radius
Last Answer : d. Angle of twist is proportional to radius