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 : 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 : The thick shell is made from laminations to get (a) Increased stresses (b) Decreased stresses (c) Uniform stresses (d) None
Last Answer : (c) Uniform stresses
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 : 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 : 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 : 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 : 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 : 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 : In a thin shell which stress is negligible a) σh b) σl c) σr d) None
Last Answer : c) σr
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 : Longitudinal strain in a thin shell is a) σh /E b) σl /E c) σr /E d) None
Description : Hoop strain in a thin shell is a) σh /E b) σl /E c) 3 σh /E d) None
Description : Which is most predominant type of failure in a thin shell? a. Bearing failure b. Compression failure c. Crushing failure d. None
Last Answer : d. None
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 : A thin cylindrical shell under internal pressure can fail by a. Shear b. Compression c. Tension d. None
Last Answer : c. Tension
Description : Radial stress in a thin shell is given by a. pD/2t b. pD/4t c. pD/3t d. None
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 : 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 : 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 : Propagation of fatigue failure is always due to compressive stresses. (a) Due to bending (b) Due to tensile (c) Due to fatigue (d) None of the listed
Last Answer : (b) Due to tensile
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 close coiled spring under axial load produces (a) Bending stresses (b) Shear stresses (c) Tensile stresses (d) None
Last Answer : (b) Shear stresses
Description : Keeping loading same but increasing the length, normal stresses in a long column will (a) Increase (b) Decrease (c) No change (d) None
Last Answer : (b) Decrease
Description : Keeping loading same but increasing the length, shear stresses in a beam will (a) Increase (b) Decrease (c) No change (d) None
Last Answer : (c) No change
Description : Keeping loading same but increasing the length, normal stresses in a beam will (a) Increase (b) Decrease (c) No change (d) None
Last Answer : (a) Increase
Description : Nature of stresses produced in buckling and bending are (a) Same (b) Different (c) Only tensile (d) None
Last Answer : (a) Same
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 : 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 : Tensile and compressive stresses in a beam of symmetrical section are (a) σt = σc (b) σt > σc (c) σt < σc (d) None
Last Answer : (a) σt = σc
Description : Variation of bending stresses in a beam have (a) Parabolic variation (b) Linear variation (c) Cubical variation (d) None
Last Answer : (b) Linear variation
Description : Tensile and compressive stresses in a beam of un-symmetrical section are (a) σt = σc (b) σt =0 (c) σc =0 (d) None
Last Answer : (d) None
Description : Five coulombs of charge are placed on a thin-walled conducting shell. Once the charge has come to rest, the electric potential inside the hollow conducting shell is found to be: w) zero x) uniform ... sphere y) smaller than the electric potential outside the sphere z) varying as one over r squared.
Last Answer : ANSWER: X -- UNIFORM INSIDE THE SPHERE AND EQUAL TO THE ELECTRIC OTENT
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
Description : Which stress is constant in a thick shell a) σh b) σl c) σr d) None
Last Answer : b) σl
Description : Maximum shear stress in a thick shell is a) (σh+ σl)/2 b) (σh+ σr)/2 c) (σh– σl)/2 d) None
Last Answer : b) (σh+ σr)/2
Description : In a thick shell which stress is negligible a) σh b) σl c) σr d) None
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 : 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 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 : Hoop stress in a thin vessel is a. pD/2t b. pD/4t c. pD/3t d. None
Last Answer : a. pD/2t
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 : The laminated springs are given initial curvature (a) To have uniform strength (b) To make it more economical (c) So that plates may become flat, when subjected to design load (d) None of these
Last Answer : (c) So that plates may become
Last Answer : (c) So that plates may become flat, when subjected to design load
Description : The length of a column, having a uniform circular cross-section of 7.5 cm diameter and whose endsare hinged, is 5 m. If the value of E for the material is 2100 tonnes/cm2, the permissible maximumcrippling load will be (a) 1.288 tonnes (b) 12.88 (c) 128.8 tonnes (d) 288.0
Last Answer : (b) 12.88
Description : A beam of uniform rectangular section 200 mm wide and 300mm deep is simply supported at its ends.It carries a uniformly distributed load of 9KN/m run over the entire span of 5m.If E=1×104 N/mm2, what is the maximum deflection? a.14.26 mm b.17.28 mm c.18.53 mm d.16.27 mm.
Last Answer : d.16.27 mm.
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 : The shear stress varies from centre to the surface of the shaft with (a) Uniform rate (b) Varying rate (c) Remains same (d) None of these
Last Answer : (a) Uniform rate
Description : The variation of shear stress in a circular shaft subjected to torsion is a. Linear b. Parabolic c. Hyperbolic. d. Uniform
Last Answer : a. Linear