Engineering Questions with Answers - Multiple Choice Questions
Strength of Materials MCQs Deflection of Cantilever
The ratio of maximum deflection of a beam to its ___________ is called stiffness of the beam.
d) Reaction at the support
Explanation: The stiffness of a beam is a measure of it’s resistance against deflection. The ratio of the maximum deflection of a beam to its span can be termed as stiffness of the beam.
Stiffness of the beam is inversely proportional to the _____ of the beam.
b) Support reaction
Explanation: Stiffness of a beam is inversely proportional to the deflection. Smaller the deflection in a beam due to given external load, greater is its stiffness.
The maximum ____ should not exceed the permissible limit to the span of the beam.
dl Bending moment
Explanation: The maximum deflection of a loaded beam should not exceed the permissible limit in relation to the span of a beam. While designing the beam the designer should be keep in mind that both strength and stiffness criteria.
In cantilever beam the deflection occurs at ______
a) Free end
b) Point of loading
c) Through out
d) Fixed end
Explanation: Deflection can be defined as the perpendicular displacement of a point on straight access to the curved axis. In cantilever beams, the maximum deflection occurs at free end.
The maximum deflection in cantilever beam of span “l”m and loading at free end is “W” kN.<br/>
Explanation: Maximum deflection occurs at free end distance between centre of gravity of bending moment diagram and free end is x = 2l/3.
As deflection is equal to the slope × “x”. The slope = Wl2/2EI radians
Maximum deflection (y) = Ax/EI = Wl3/3EI.
In an ideal fluid, the ____________ stresses are pretend to be absent.
Explanation: An ideal fluid is a fluid where there is no resistance to the deformation. Ideal Fluids are those Fluids which have no viscosity surface tension. The shear stress is also absent. This fluid is also called as perfect fluid.
Air and water are the examples of ___________
a) Non Newtonian fluids
b) Vortex fluids
c) Real fluids
d) Ideal fluids
Explanation: The ideal Fluids are imaginary fluids in nature, they are incompressible. These fluids possess low viscosity. Air and water are considered as ideal fluids.
_______ fluids are practical fluids
Explanation: These fluids possess properties such as viscosity, surface tension. They are compressible in nature. The certain amount of resistance is always offered by the fluids, they also possess shear stress. They are also known as practical fluids.
Specific weight of water at 4°C is ____________ N/m3.
Explanation: The specific weight (weight density) of a fluid is weight per unit volume. It is represented by symbol w & it is expressed in Newton per metre cube (N/m3). The specific weight of water at 4 degree centigrade is 9810 N/m3or 9.81 kN/m3.
The inverse of specific weight of a fluid is __________
a) Specific gravity
b) Specific Volume
Explanation: Specific volume is the volume of the fluid by Unit Weight it is the reciprocal of specific weight is denoted by “v”. SI units are m3/N.
v= 1/specific weight.
Calculate the specific gravity of mercury.
Explanation: The specific gravity of any fluid is the ratio of the specific weight of fluid by specific weight of water. For mercury, the specific weight is 133416 N/m3. For water, w = 9810 N/m3.
S = 133416/9810
Specific gravity of water is __________
Explanation: The specific gravity is also called as relative density. It is dimensionless quantity and it has no units. The specific gravity of water is the ratio of specific weight of fluid to specific weight of water, as both the numerator and denominator are same. The value is 1.
Compute the maximum deflection at free end of a cantilever beam subjected to udl for entire span of l metres.
Explanation: The slope at free end = A/EI = wl3/6EI
Maximum deflection at free end is Ax/EI; [x= ¾ l] y= wl3/6EI × ¾ l = wl4/8EI.
Calculate the maximum deflection of a cantilever beam with udl on entire span of 3m the intensity of you udl be 25 kN/m. Take EI as 4000 kN/m2.
Explanation: For cantilever beams with udl on entire span, the maximum deflection = wl4/8EI
y = wl4/8EI = 25 × 34/ 8 × 4000 = 0.063m.
Which of the following is not an example of Malleability?
a) Wrought Iron
b) Ornamental silver
d) Ornamental gold
Explanation: Torsteel is an example of mechanical property ductility. The ductility is a property of a material by which material can be fractured into thin wires after undergoing a considerable deformation without any rupture.
Strength of Materials MCQs Deflection of Simply Supported
__________ of a beam is a measure of its resistance against deflection.
d) Maximum bending
Explanation: The ratio of maximum deflection of a beam to its corresponding span is termed as the stiffness of the beam. It is the measure of resistance against the deflection.
The maximum induced ___________ stresses should be within the safe permissible stresses to ensure strength of the beam.
Explanation: A beam is said to be strengthy when the maximum induced bending and shear stresses are within the safe permissible stresses of the beam material.
Elastic line is also called as ___________
a) Deflection curve
b) Plastic curve
c) Linear curve
d) Hooke’s curve
Explanation: The deflection curve is defined as the line to which the longitudinal axis of a beam deflects or bends under given load. This curve is also known as elastic line or elastic axis.
In simply supported beams, the slope is _____________ at supports.
Explanation: The slope at any section in the deflected beam is defined as the angle developed in radians which the tangent at the section makes with the actual axis of the proposed beam. In simply supported beams, the slope is maximum at the supports.
In simply supported beam deflection is maximum at ____________
c) Point of loading
d) Through out
Explanation: In simply supported beams, deflection is maximum at the mid span of a symmetrically loaded
Calculate the maximum deflection of a simply supported beam if the maximum slope at A is 0.0075 radians and the distance of centre of gravity of bending moment diagram to support A is 1.33 metres.
a) 9.975 mm
b) 9.5 mm
c) 9.25 mm
d) 9.785 mm
Explanation: The deflection occurs at support A = A/EI = 0.0075 radians
Maximum deflection = Ax/EI = 0.0075 × 1.33
y = 9.975 mm.
____________ is the best example for accelerator (admixture).
a) Sulphonated formaldehyde
b) Calcium chloride
c) Sulphonated naphthalene
Explanation: Calcium chloride is more widely used as an accelerator. By adding two percent (2%) of the weight of cacl2 admixture to the Portland cement the Maximum strength is attained within 1-3 days.
_____________ is used to reduce the time for hardening of concrete.
b) Super plasticizer
d) Air entraining admixture
Explanation: The admixtures (retarders) are generally used to reduce the time for hardening of concrete. They are used in situations like:
i. In hot weather condition, a tendency towards false set is corrected
ii. When concrete is to be placed in difficult positions.
Full form of LEED ________
a) Leadership in Energy and Efficiency Development
b) Leadership in Environmental and Energy Design
c) Leadership in Energy and Environmental Design
d) Leadership in Efflorescence and Energy Demand
Explanation: LEED stands for Leadership in Energy and Environmental Design. The fly ash is environmentally friendly solutions that meet or exceed performance specifications fly ash contributes a lot to LEED.
_____ has a lower heat of hydration.
a) Quarry dust
b) Fly ash
c) Ordinary Portland cement
d) Bulk sand
Explanation: The process that liberates heat when water is added to cement is known as heat of hydration. The process of hydration is not instantaneous. The fly ash is possessing lower heat of hydration.
The factors that influence rate of hydration is _________
a) The fineness of cement
b) Temperature of cement
c) Quality of water
d) Temperature of water
Explanation: The products of hydration are colloidal and increase the surface area of solid paste during hydration and the water is the main ingredient which reacts chemically. The rate of hydration is mainly influenced by temperature of cement.
The steel suits best to reinforcement with concrete.
Explanation: The Steel is be used for reinforcing a concrete for following properties:
i. Steel is about 30 times stronger in compression and 300 times stronger intention compared to concrete.
ii. It develops good bond with concrete
iii. It is highly fire resistant.
The average crushing strength of precast concrete blocks as per CAI is __________
a) 4.5 N/mm2
b) 5 N/mm2
c) 3.5 N/mm2
d) 4 N/mm2
Explanation: Hollow concrete blocks are used in load bearing walls. In the manufacture of these blocks, the light height aggregates are used. The recommended size is 39 × 19 × 30 cm.
The average crushing strength of blocks Shall be 5N/mm2.
A simply supported beam of span as shown in the figure is subjected to a concentrated load w at its metre span and also to a uniformly distributed load equality w what is the total diffraction it its midpoint.
a) 18 Wl3 /384 EI
b) 13 Wl3/ 384 EI
c) 5 Wl3/ 384 EI
d) 18 Wl3/ 384 EI
Explanation: The total deflection at midpoint of a simply supported beam is
y = 5Wl3/ 384 EI + Wl3/ 48 EI
y = 13Wl3/ 384 EI.
Meander ratio is the ratio of meander belt to __________
a) Meander depth
b) Meander width
c) Meander length
d) Meander cross-section
Explanation: When a river departs from its straight course and follows a sinuous winding path, the river is said to be meandering. Meander ratio is the ratio of meander belt to the meander length.
Strength of Materials MCQs Analyse Slope of Various Beams
A cantilever beam subjected to a point load at free end of span “l” m and possess flexural rigidity (EI).
a) Wl3 / 6EI
b) Wl4/ 8EI
c) Wl2/ 2EI
d) Wl4/ 5EI
Explanation: Area of BMD = A = Wl2/ 2.
According to Mohr’s theorem 1, slope (i) = A/EI = Wl2/ 2EI radians.
Cantilever scaffolding is also known as ____________
a) mason’s scaffolding
b) suspended scaffolding
c) needle scaffolding
d) ladder scaffolding
Explanation: The cantilever scaffolding consists of platform supported by series of cantilever beams passing through window openings. They are used when it is not possible to fix the standards into the ground. It is also known as needle scaffolding.
Scaffolding you generally adopted when the height of structure is above ___________
a) 1.3 m
b) 1.5 m
c) 1.7 m
d) 2.2 m
Explanation: Scaffolding is a temporary platform provided with necessary supports close to the work to provide a limited space for the labours and workers for the construction of masonry work of any structure above 1.5 m.
The horizontal platform in between any two flights of a staircase is called ___________
Explanation: Landing in stair may be defined as the horizontal platform provided in between any two flights landing. Landing which provides 90 degree turn in the layout of a stair is known as quarter space landing.
The ratio of maximum load to the unit area is ________
a) Ultimate bearing capacity
b) Allowable bearing capacity
c) Safe bearing capacity
d) Bearing capacity
Explanation: The term bearing capacity of the soil is defined as the maximum load per unit area which the soil will resist safely without yielding or displacement.
______ is part of a structure which transmits the load to the soil underneath.
Explanation: The lowest artificial built part of structure which transmits the load of the structure to the soil lying underneath. The foundation of a structure is always constructed below ground level. They distribute the load of structure over large bearing area. It increases the stability of the structure as a whole.
Full form of NBC ___________
a) Nominal Building Centre
b) National Building Code
c) National Building Cluster
d) Nominal Buoyance Centre
Explanation: NBC stands for National Building Code. According to NBC, all the buildings existing and in construction are classified into number of groups. The respective crystal details are followed with respective synapses.
The ultimate bearing capacity/factor of safety = ____________
a) Bearing capacity
b) Allowance bearing capacity
c) Safe bearing capacity
d) Soil consolidation capacity
Explanation: The safe bearing capacity of the soil is equal to ultimate bearing capacity divided by certain factor of safety. Roughly a factor of safety of 2 is used for most of the building sites and generally, a factor of safety of 2.5 to 3 is considered for heavy building constructions.
_____ is measured on percentage basis.
b) Formation width
c) Super elevation
Explanation: The rise given to the centre of the carriage way with reference to its edge can be termed as camber. It is expressed as 1 vertical to n horizontal. It is also measured along percentage basis.
______ bridge any opening like a window, door, cupboard etc in a building.
Explanation: Lintel is a horizontal structural member spanning any opening to support loads of the structure coming over it.
i) To facilitate the fixing of doors and windows frames wherever.
ii) They used to receive load from wall constructed over them.
The first solar cooker was developed in the year ____________
Explanation: The Solar cookers have a very relevant place in the present fuel consumption pattern. The first solar cooker was developed in the year 1945 by Mr M K Ghosh. The main reasons for non- acceptance of this device was a cheap availability of cooking fuel.
Solar arrays are defined in terms of ____________
Explanation: The solar arrays are electrically defined in terms of circuits each of which contributes a portion of the total current output at some nominally specified array voltage.
In a cantilever of span “L” subjected to a concentrated load of “W” at a distance of L/3 from free end. The deflection is ________
Explanation: The deflection developed at the
y= W × ( 2L/3)3/ 3EI
y= 8WL3/81 EI.
Calculate the slope in a simply supported beam subjected to point load at centre. Take the EI into consideration.
Explanation: The slope in a beam can be determined by Mohr’s theorem 1: i = A/EI.
The BMD of beam portion will be Wl2/16.
The slope (i) = Wl2/16EI.
Which of the following is a mechanical property of materials?
a) Surface Tension
d) Specific volume
Explanation: The elasticity is the property by which the body returns to its original shape after the removal of external load. If a body regains completely its original shape is said to be a perfectly elastic material. Rubber, mild steel and copper may be considered to be perfectly elastic within certain limits.