Description : Radial stress in a thin shell is given by a. pD/2t b. pD/4t c. pD/3t d. None
Last Answer : d. None
Description : Value of σr in a thin shell is a) pD/2t b) pD/4t c) pD/3t d) None
Last Answer : d) None
Description : If is the internal pressure in a thin cylinder of diameter and thickness , the developed hoop stress, is (A) pd/2t (B) pd/4t (C) pd/t (D) 2pd/t
Last Answer : (A) pd/2t
Description : Longitudinal stress in a cylinder is given by [symbols have their usual meanings]. a) PD/2t b) 2PD/t c) PD/4t d) 4PD/t
Last Answer : c) PD/4t
Description : Tangential stress in a cylinder is given by [symbols have their usual meanings]. a) PD/2t b) 2PD/t c) PD/4t d) 4PD/t
Last Answer : a) PD/2t
Description : Design of a thin shell under pressure is done on the basis of a. Radial stress b. Longitudinal stress c. Hoop stress d. All the three stresses
Last Answer : c. Hoop stress
Description : Which stress is the least in a thin shell a. Longitudinal stress b. Hoop stress c. Radial stress d. None
Last Answer : c. Radial stress
Description : A spherical pressure vessel is made of thin magnesium plate 0.25 cm thick. The main diameter of the sphere is 600 cm and allowable stress in tension is 900 kg/cm2. The safe internal gas pressure for the vessel would be a) 0.5 kg/cm2 b) 1.5 kg/cm2 c) 4.5 kg/cm2 d) 5.7 kg/cm2
Last Answer : b) 1.5 kg/cm2
Description : Hoop strain in a thin shell is a) σh /E b) σl /E c) 3 σh /E d) None
Description : The ratio of maximum bending stress to maximum shear stress on the cross section when a shaft is simultaneously subjected to a torque T and bending moment M, a. T/M b. M/T c. 2T/M d. 2M/T
Last Answer : d. 2M/T
Description : A thick cylinder is subjected to an internal pressure of 60 MPa. If the hoop stress on the outer surface is 150 MPa, then the hoop stress on the internal surface is a) 105 MPa b) 180 MPa c) 210 MPa d) 135 MPa.
Last Answer : c) 210 MPa
Description : In a thick-cylinder pressurized from inside, the hoop stress is maximum at a) The center of the wall thickness b) the outer radius c) the inner radius d) both the inner and the outer radii
Last Answer : c) the inner radius
Description : If a curve is represented parametrically by the equations `x=4t^(3)+3` and `y=4+3t^(4)` and `(d^(2)x)/(dy^(2))/((dx)/(dy))^(n)` is constant then the v
Last Answer : If a curve is represented parametrically by the equations `x=4t^(3)+3` and `y=4+3t^(4)` and `(d^(2) ... (dy))^(n)` is constant then the value of n, is
Description : Vessel is said to be thin if a. D/t =20 b. D/t=10 c. D/t >20 d. D/t >10
Last Answer : c. D/t >20
Description : A vessel is said to be thin if a. Its wall has less thickness b. Stresses are uniform over the entire thickness c. Stresses vary at inner and at outer radius d. None of the above
Last Answer : b. Stresses are uniform over the entire thickness
Description : If G is the specific gravity of particles of diameter d, the velocity of settlement V in still water at T°C, according to Stoke's law, is (A) V = 418 (G - 1) d² [(3T + 70)/100] (B) V = 418 (G - 1) d [(3T - ... 1) d² [(2T + 70)/100] (D) V = 418 (G - 1) d 4 [(3T + 70)/100]
Last Answer : (A) V = 418 (G - 1) d² [(3T + 70)/100]
Description : Power transmitted by shaft is equal to a. Tw b. T/w c. w/T d. 2T/w
Last Answer : a. Tw
Description : Hoop shrinking in thick cylinders is done to achieve (a) Increased stresses (b) Decreased stresses (c ) Uniform stresses (d) None
Last Answer : Hoop shrinking technique is used to make the stresses on the cylinder walls evenly distributed around the circumference of the cylinder, which results in a uniform stress distribution. This is important for ... under load. It also makes sure that the cylinder can withstand the pressure inside it.
Description : What is the ratio of hoop stresses in a spherical vs cylindrical shell of same diameter, thickness and under same pressure? a. 4:1 b. 2:1 c. 1:2 d. 1:4
Last Answer : c. 1:2
Description : In a thin shell which stress is negligible a) σh b) σl c) σr d) None
Last Answer : c) σr
Description : A thin spherical shell under internal pressure will fail under a. Maximum shear stress b. Principal compressive stress c. Principal tensile stress d. None
Last Answer : c. Principal tensile stress
Description : Pick up the correct statement from the following: (A) Hoop strain of the walls of a cylinder due to liquid is (pd/2tE) (1 - 1/2m) (B) Longitudinal strain in the walls of a cylinder due to liquid is ... change in the cylinder due to liquid is (pd/2tE) (5/2 - 2/m) (D) All the above
Last Answer : (D) All the above
Description : Lame's theory is associated with a) thick cylindrical shells b) thin cylindrical shells c) direct and bending stresses d) none of these
Last Answer : a) thick cylindrical shells
Description : When a thin cylindrical shell is subjected to an internal pressure, there will be a) a decrease in diameter and length of the shell b) an increase in diameter and length of the shell c) an ... and decrease in length of the shell d) a decrease in diameter and increase in length of the shell
Last Answer : b) an increase in diameter and length of the shell
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 : Longitudinal strain in a thin shell is a) σh /E b) σl /E c) σr /E d) None
Description : Which one is most important in a thin shell? a) d/t 10 c) Stresses are uniform d) None
Last Answer : c) Stresses are uniform
Description : Which is most predominant type of failure in a thin shell? a. Bearing failure b. Compression failure c. Crushing failure d. None
Description : Stresses in a thin cylindrical shell under internal pressure is independent of a. Diameter b. Thickness c. Length d. Diameter and thickness
Last Answer : c. Length
Description : A thin cylindrical under internal pressure can fail along the a. Longitudinal joint b. Circumferential joint c. Longitudinal as well as circumferential joint d. None
Last Answer : c. Longitudinal as well as circumferential joint
Description : A thin cylindrical shell under internal pressure can fail by a. Shear b. Compression c. Tension d. None
Last Answer : c. Tension
Description : Among the cylindrical and spherical thin vessels of same material, diameter and pressure which has the lesser thickness a. Cylindrical shell b. Spherical shell c. Cylindrical shell with semi spherical heads d. None
Last Answer : b. Spherical shell
Description : The property of a material by which it can be beaten or rolled into thin sheets, is called (a) Elasticity (b) Plasticity (c) Ductility (d) Malleability
Last Answer : (d) Malleability
Description : What will happen if stresses induced due to surge in the spring exceeds the endurance limit stress of the spring. (a) Fatigue Failure (b) Fracture (c) None of the listed (d) Nipping
Last Answer : (a) Fatigue Failure
Description : Maximum bending stress in a leaf spring is (a) 3WL/4nbt2(b) 3WL/8nbt2(c) 3WL/2nbt2(d) None
Last Answer : (c) 3WL/2nbt2
Description : Wahl suggested the correction in the stress factor to account for a. the additional transverse shear stress b. stress concentration c. fatigue stress d. axial stress
Last Answer : b. stress concentration
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 : Compute the maximum shearing stress developed in a phosphor bronze spring having mean diameter of 200 mm and consisting of 24 turns of 20-mm diameter wire when the spring is stretched 100 mm. and G = 42 GPa. a. 51 MPa b. 31.89 MPa c. 80 MPa d. 70 MPa
Last Answer : b. 31.89 MPa
Description : A helical spring is fabricated by wrapping wire 19.05 mm in diameter around a forming cylinder 203.2 mm in diameter. Compute the number of turns required to permit an elongation of 101.6 mm. without exceeding a shearing ... G = 82737 N/mm2. a. 10 turns b. 20 turns c. 25 turns d. 30 turns
Last Answer : a. 10 turns
Description : Determine the maximum shearing stress and elongation in a helical steel spring composed of 20 turns of 20-mm-diameter wire on a mean radius of 90 mm when the spring is supporting a load of 1.5 kN. and G = 83 GPa. a. 200 mm b. 105.4 mm c. 150 mm d. 250 mm
Last Answer : b. 105.4 mm
Description : Value of Wahl’s stress concentration factor is always (a) > 1 (b) = 1 (c) < 1 (d) None
Last Answer : (a) > 1
Description : Wahl’s stress concentration factor is used in close coiled springs under axial load to account for (a) Shear effect (b) Bending effect (c) Compression effect (d) none
Last Answer : (b) Bending effect
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 : When two helical springs of equal lengths are arranged to form a cluster spring, then a. Shear stress in each spring will be equal b. Load taken by each spring will be half the total load c. Only A is correct d. Both A and B is correct
Last Answer : d. Both A and B is correct
Description : 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
Last Answer : b) 468.6N/mm²
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 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 : Shear stress in a close coiled helical spring is (a) 16WD/π d3 (b) 32WD/π d3 (c) 8WD/π d3 (d) None
Last Answer : (c) 8WD/π d3
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 : In a thick cylindrical shell subjected to an internal pressure (p), the radial stress across the thickness of a cylinder is a) maximum at the outer surface and minimum at the inner surface b) maximum ... and zero at the outer surface d) maximum at the outer surface and zero at the inner surface
Last Answer : c) maximum at the inner surface and zero at the outer surface