A lift of weight W is lifted by a rope with an acceleration f. If the area of cross-section of the rope
is A, the stress in the rope is
(A) [W (1 + f/G)]/A
(B) (1 - g/f)/A
(C) [W (2 + f/G)]/A
(D) [W (2 + g/f)]/A
Description : If At is the area of steel cross-section, t is working stress, L is width of road and W is weight of slab per square metre, the spacing of the tie bars for a longitudinal joint, is (A) (100 At × t)/WL (B) 100 At/tWL (C) (100 WAt × t)/tL (D) 100 WL/At t
Last Answer : Answer: Option D
Description : A 5 kilogram mass is lifted at constant velocity from a shop floor by a rope that passes through a pulley attached to the shop's ceiling. Neglecting the mass of the rope and friction in the pulley, what is the approximate tension in the rope? w) 100 newtons x) 50 newtons y) 25 newtons z) 5 newtons
Last Answer : ANSWER: X -- 50 NEWTONS
Description : is the pre-stressed force applied to the tendon of a rectangular pre-stressed beam whose area of cross section is and sectional modulus is . The maximum stress in the beam, subjected to a maximum bending moment , is (A) f = (P/A) + (Z/M) ... ) + (M/Z) (C) f = (P/A) + (M/Z) (D) f = (P/A) + (M/6Z)
Last Answer : Answer: Option C
Description : is the pre-stressed force applied to tendon of a rectangular pre-stressed beam whose area of cross section is and sectional modulus is . The minimum stress on the beam subjected to a maximum bending moment is (A) f = (P/A) - (Z/M) (B) f = (A/P) - (M/Z) (C) f = (P/A) - (M/Z) (D) f = (P/A) - (M/6Z)
Description : During turning the traction while operating MB plough a) Plough should be lifted b) Plough should not be lifted c) Stop the tractor and lift the plough d) Unable to lift Ans. a
Last Answer : ans a
Description : If a concrete column 200 200 mm in cross-section is reinforced with four steel bars of 1200 mm2 total cross-sectional area. Calculate the safe load for the column if permissible stress in concrete is 5 N/mm2 ... 15 Ec (A) 264 MN (B) 274 MN (C) 284 MN (D) 294 MN
Last Answer : (C) 284 MN
Description : Strain energy of a member may be equated to (A) Average resistance × displacement (B) ½ stress × strain × area of its cross-section (C) ½ stress × strain × volume of the member (D) ½ (stress)2 × volume of the member + Young's modulus E
Last Answer : (D) ½ (stress)2 × volume of the member + Young's modulus E
Description : Viscous force is the __________ of shear stress due to viscosity and cross-section area of flow. (A) Sum (B) Different (C) Product (D) Ratio
Description : The maximum magnitude of shear stress due to shear force F on a rectangular section of area A at the neutral axis, is (A) F/A (B) F/2A (C) 3F/2A (D) 2F/3A
Last Answer : (C) 3F/2A
Description : Pick up the incorrect statement from the following. The intensity of horizontal shear stress at the elemental part of a beam section, is directly proportional to (A) Shear force (B) Area of the section ... . of the area from its neutral axis (D) Moment of the beam section about its neutral axis
Description : In a beam, the neutral plane (A) May be its centre (B) Passes through the C.G. of the area of cross-section (C) Does not change during deformation (D) None of these
Last Answer : (C) Does not change during deformation
Description : A bar L metre long and having its area of cross-section A, is subjected to a gradually applied tensile load W. The strain energy stored in the bar is (A) WL/2AE (B) WL/AE (C) W²L/AE (D) W²L/2AE
Last Answer : (D) W²L/2AE
Description : The tension in the wire rope supporting a lift moving with a uniform velocity a.Is more when the lift is moving upwards b.Is more when the lift is moving downwards c.Is less when the lift ... down-wards d.Is less when the lift is moving upwards e.Remains constant irrespective of the lift movement
Last Answer : e. Remains constant irrespective of the lift movement
Description : How do you calculate the distance the rope needs to be pulled to lift the load?
Last Answer : Need answer
Description : A body whose true weight is 14 kg appears to weigh 15 kg when weighed with the help of a spring balance in a moving lift. The acceleration of the lift at the time was a.1 m/sec2 b.0.7 m/sec2 c.0.5 m/sec2 d.1.4 m/sec2 e.0.35 m/sec2
Last Answer : b. 0.7 m/sec2
Description : Our weight will be zero under all of the following conditions EXCEPT a.107 dynes b.We are at the centre of the earth c.When we are ascending in a lift with acceleration of 4.9 m/s2 d.We are orbiting in a satellite e.When we are freely faling
Last Answer : c. When we are ascending in a lift with acceleration of 4.9 m/s2
Description : The apparent weight of a person in a lift which is moving down with uniform acceleration is _______. (1) greater than the weight when the person is stationary (2) twice the weight when the person ... than the weight when the person is stationary (4) same as the weight when the person is stationary
Last Answer : (3) less than the weight when the person is stationary
Description : The apparent weight of a man in a lift is less the real weight when – (1) the lift is going up with an acceleration (2) the lift is going down with uniform speed (3) the lift is going up with uniform speed (4) the lift is going down with an acceleration
Last Answer : (4) the lift is going down with an acceleration Explanation: If the lift accelerates downwards with acceleration a, then the apparent weight of the man standing in the lift will be less than the ... upwards with acceleration, then the apparent weight of the man will be greater than his true weight.
Description : If lift is going up with acceleration, the apparent weight of a body is - (1) may be more or less than true weight (2) equal to the true weight (3) less than the true weight (4) more than the true weight
Last Answer : (4) more than the true weight Explanation: If lift is going up with acceleration, the apparent weight of a body is more than the true weight.
Description : If a lift is going up with acceleration, the apparent weight of a body is - (1) More or less the true weight (2) Equal to the true weight (3) Less than the true weight (4) More than the true weight
Last Answer : (4) More than the true weight Explanation: If a lift is going up with acceleration, the apparent weight of a body is more than the true weight.
Description : The apparent weight of a man in a lift is less the real weight when : (1) the lift is going up with an acceleration (2) the lift is going down with uniform speed (3) the lift is going up with uniform speed (4) the lift is going down with an acceleration
Last Answer : the lift is going down with an acceleration
Description : If V is speed of a moving vehicle, r is radius of the curve, g is the acceleration due to gravity, W is the width of the carriageway, the super elevation is (A) WV/gr (B) W²V/gr (C) WV²/gr (D) WV/gr²
Description : Shear deflection of a cantilever of length L, cross sectional area A and shear modulus G, under a concentrated load W at its free end, is (A) (2/3) (WL/AG) (B) (1/3) (WL²/EIA) (C) (3/2) (WL/AG) (D) (3/2) (WL²/AG
Last Answer : (C) (3/2) (WL/AG
Description : Shear deflection of a cantilever of length L, cross sectional area A and shear modulus G, subjected to w/m u.d.l., is (A) (3/4) (L²w/GA) (B) (3/2) (L²w/GA) (C) (2/3) (L3w/GA) (D) (3/2) (Lw/GA²)
Last Answer : (A) (3/4) (L²w/GA)
Description : The yield moment of a cross section is defined as the moment that will just produce the yield stress in (A) The outer most fibre of the section (B) The inner most fibre of the section (C) The neutral fibre of the section (D) The fibre everywhere
Last Answer : (A) The outer most fibre of the section
Description : If the stress in each cross-section of a pillar is equal to its working stress, it is called (A) Body of equal (B) Body of equal section (C) Body of equal strength (D) None of these
Last Answer : (C) Body of equal strength
Description : The region of the cross-section of a column in which compressive load may be applied without producing any tensile stress, is known as the core of the cross-section. In circular columns the radius of the core, ... One-third of the radius (C) One-quarter of the radius (D) One-fifth of the radius
Last Answer : (C) One-quarter of the radius
Description : When a rectangular beam is loaded transversely, the maximum compressive stress develops on (A) Bottom fibre (B) Top fibre (C) Neutral axis (D) Every cross-section
Last Answer : (B) Top fibre
Description : A simply supported wooden beam 150 cm long and having a cross section 16 cm × 24 cm carries a concentrated load, at the centre. If the permissible stress ft = 75 kg/cm2 and fs= 10 kg/cm2 the safe load is (A) 3025 kg (B) 3050 kg (C) 3075 kg (D) 3100 kg
Last Answer : (C) 3075 kg
Description : The intensity of direct longitudinal stress in the cross-section at any point distant r from the neutral axis, is proportional to (A) r (B) 1/r (C) r2 (D) 1/r²
Last Answer : (A) r
Description : In a bar of large length when held vertically and subjected to a load at its lower end, its ownweight produces additional stress. The maximum stress will be (A) At the lower cross-section (B) At the built-in upper cross-section (C) At the central cross-section (D) At every point of the bar
Last Answer : (B) At the built-in upper cross-section
Description : According to the principle of buoyancy a body totally or partially immersed in a fluid will be lifted up by a force equal to (A) The weight of the body (B) More than the weight of the body (C) Less than the weight of the body (D) Weight of the fluid displaced by the body
Description : When a body is immersed wholly or partially in a liquid, it is lifted up by a force equal to the weight of liquid displaced by the body. This statement is called (A) Pascal's law (B) (C) Principle of floatation (D) Bernoulli's theorem
Last Answer : Answer: Option B
Description : If M, I, R, E, F, and Y are the bending moment, moment of inertia, radius of curvature, modulus of elasticity stress and the depth of the neutral axis at section, then (A) M/I = R/E = F/Y (B) I/M = R/E = F/Y (C) M/I = E/R = E/Y (D) M/I = E/R = Y/F
Last Answer : (C) M/I = E/R = E/Y
Description : The breaking strength of a rope is 400 N. A fireman weighing 60 kg slides down the rope. The rope will break if a.107 dynes b.the acceleration is 7.5 m/s2 c.the acceleration is 1.2 m/s2 d.the acceleration is 3.1 m/s2 e.the slides with an acceleration of 15 m/s2
Last Answer : c. the acceleration is 1.2 m/s2
Description : A block of mass m is pulled along a surface as shown. The coefficient of kinetic friction between the block and the surface is m and the tension in the rope is T. The acceleration of the block is (a) a = T cos q/mg (b) a = T cos q/mgm (c) a = T cos q/m + mmg (d) None of the above
Last Answer : Ans:(d)
Description : Bending stress will be least at the extreme fibres for (a) Maximum area of cross section (b) Maximum moment of inertia (c) Maximum section modulus (d) None
Last Answer : (c) Maximum section modulus
Description : Real stress after load application is based on (a) Original area of cross section (b) Changing area of cross section (c) Final area of cross section under maximum load (d) None
Last Answer : b) Changing area of cross section
Description : Unit stress after load application is based on (a) Original area of cross section (b) Changing area of cross section (c) Final area of cross section under maximum load (d) None
Last Answer : (a) Original area of cross section
Description : The greatest eccentricity which a load W can have without producing tension on the cross-section of a short column of external diameter D and internal diameter d, is (A) 4W/ (D² - d²) (B) (D² - d²)/32D (C) (D² + d²)/8D (D) (D² - d²)/8D
Last Answer : (C) (D² + d²)/8D
Description : Elongation of a bar of uniform cross section of length ‘L’, due to its own weight ‘W’ is given by a. 2WL/E b. WL/E c. WL/2E d. WL/3E Where, E=Young’s modulus of elasticity of material
Last Answer : c. WL/2E
Description : To pump water from a water reservoir 3 m deep and maximum water level at 135 m, a pump is installed to lift water up to R.L. 175 m at a constant rate of 36,00,000 litres per hour. If the length of the ... the water horse power of the pump is (A) 400 (B) 450 (C) 500 (D) 600
Last Answer : (D) 600
Description : While testing a cast iron beam (2.5 cm × 2.5 cm) in section and a metre long simply supported at the ends failed when a 100 kg weight is applied at the centre. The maximum stress induced is: (A) 960 kg/cm2 (B) 980 kg/cm2 (C) 1000 kg/cm2 (D) 1200 kg/c
Last Answer : (A) 960 kg/cm
Description : An R.C.C. beam of 25 cm width and 50 cm effective depth has a clear span of 6 metres and carries a U.D.L. of 3000 kg/m inclusive of its self weight. If the lever arm constant for the section is 0.865, the maximum intensity ... , is (A) 8.3 kg/cm2 (B) 7.6 kg/cm2 (C) 21.5 kg/cm2 (D) 11.4 kg/cm2
Last Answer : Answer: Option A
Description : Water rises in a capillary tube to a height h. It will rise to a height more than h. a.in a lift moving up with an acceleration b.in all the above cases c.107 dynes d.at the poles e.on the surface of moon
Last Answer : e. on the surface of moon
Description : A man is standing on a weighing machine in a lift which is moving. The weighing machine will show minimum reading when, the lift is moving A. In a free fall due to failure of the lift mechanism B. Upward with uniform acceleration C. Downward with uniform acceleration D. Upward with uniform speed
Last Answer : ANSWER: A
Description : A man is standing on a weighing machine in a lift which is moving. The weighing machine will slow MINIMUM reading when, the lift is moving? A. Upward with uniform speed B. Downward with uniform acceleration C. In a free fall due to failure of the lift mechanism (Answer) D. None of these
Last Answer : C. In a free fall due to failure of the lift mechanism (Answer)
Description : If flaps are lowered during the take-off run: a. The lift would not change until the aircraft is airborne b. The lift would increase when the flaps are lowered c. The lift would decrease d. The acceleration would increase
Last Answer : b. The lift would increase when the flaps are lowered
Description : The Modulus of Elasticity for a material refers to: w) the ability of a material to resist corrosion x) the ratio of stress over strain y) the maximum load over the cross sectional area z) none of the above
Last Answer : ANSWER: X -- THE RATIO OF STRESS OVER STRAIN