Engineering Questions with Answers - Multiple Choice Questions
Strength of Materials MCQs Deflection of Fixed Beam
1 - Question
In fixed beams, the maximum deflection at __________ is reduced.
a) Centre
b) Supports
c) At point of loading
d) Through out
View Answer
Answer: a
Explanation: In fixed beams, the maximum bending moment developed at the centre is reduced. Hence it results in the reduction of deflection of a beam at its centre considerably.
2 - Question
Fixing couples means _____
a) End moments
b) Support couples
c) Support moments
d) End supports
View Answer
Answer: c
Explanation: If the ends are built in, end moments are automatically developed. These moments are called as fixing couples or fixing moments or support moments.
3 - Question
Calculate the maximum bending moment in fixed beam for the following figure.<br/>
a) 17 kN-m<br/>
b) 12.5 kN-m<br/>
c) 15.625 kN-m<br/>
d) 18 kN-m
View Answer
Answer: c
Explanation: For a fixed beam, the maximum bending moment is w×l / 8.
Maximum bending moment (M) = 25 × 5 / 8
= 15.625 kNm.
4 - Question
_________ is provided to prevent the debris from entering into the penstock.
a) Tash rack
b) Surge tank
c) Anchor blocks
d) Power house
View Answer
Answer: a
Explanation: Trash rack is a structure which is provided to prevent the debris from entering into the penstock. The trash racks are usually located ahead of the gates. The debris which is collected on the trash rack may be removed either manually or with the help of automatic power driven racks.
5 - Question
__________ regulates the speed of turbine.
a) Tail race
b) Anchor blocks
c) Power house
d) Surge tank
View Answer
Answer: d
Explanation: The surge tank controls the pressure variations in a penstock. Thereby the penstock is protected from effects of water hammer pressure. The surge tank is provided on large penstock to regulate the speed of the turbine.
6 - Question
The sheet of water flowing through a notch is called ________
a) Sill
b) Crest
c) Scour
d) Nappe
View Answer
Answer: d
Explanation: The sheet of water flowing through notch or weir is called as the nappe or vein. The bottom of the notch or the top of the weir over which the water flows is known as the sill.
7 - Question
Which of the following is empirical formula coined by Francis?
a) 2.36 LH3/2
b) 1.84 LH3/2
c) 3.34 LH3/2
d) 1.96 LH3/2
View Answer
Answer: b
Explanation: Francis proposed the following formula for discharge over rectangular weir by assuming Cd = 0.623
Q = 1.84 LH3/2
Where Q = discharge in m3/ s.
8 - Question
Calculate discharge of a weir 2 metre long with a water flow over a head of 250 mm use Francis formula.
a) 0.34 m3/s
b) 0.46 m3/s
c) 0.25 m3/s
d) 0.65 m3/s
View Answer
Answer: b
Explanation: Given that:
Length of weir = L = 2m.
Head over the weir = 0.25 m
Using Francis formula; Q =1.84 LH3/2 = 1.84 × 2×(0.25)3/2.
Q = 0.46 m3/s.
9 - Question
1 litre = ____________ m3.
a) 104
b) 103
c) 10-3
d) 10-4
View Answer
Answer: c
Explanation: 1 litre = 10-3m3.
For example, Q = 40 lit/min = 40/60 lit/sec = 0.67 × 10-3m3/sec.
10 - Question
In cipoletti weir, the side slopes are _______________
a) 1 in 3
b) 1 in 2
c) 1 in 5
d) 1 in 4
View Answer
Answer: d
Explanation: A trapezoidal weir, which has side slopes of 1 horizontal to 4 vertical, is called as cipoletti weir. The discharge over a cipolletti weir is equal to the discharge over a rectangular Weir without end contractions.
11 - Question
The flow of thick oil through a small tube is an example for _________
a) Laminar flow
b) Turbulent flow
c) Rotational flow
d) Steady flow
View Answer
Answer: a
Explanation: A flow is said to be laminar when the paths taken by the individual particles do not cross one another. It is also called as streamline flow. The flow of thick oil through a small tube is an example for laminar flow.
12 - Question
Flow in rivers is an example of __________ flow.
a) Rotational
b) Laminar
c) Compressible
d) Turbulent
View Answer
Answer: d
Explanation: A flow is said to be turbulent when the liquid particles move in a zig-zag way and their paths also cross each other. The flow in rivers at the time of floods is a perfect example of turbulent flow.
13 - Question
What is the point of contraflexure in a fixed beam of span 5m?
a) 3m
b) 2.75 m
c) 3.75 m
d) 4 m
View Answer
Answer: c
Explanation: The point of contraflexure from any support be 3×l / 4.
From support A = 3l/4 = 3×5/4 = 3.75 m.
From support B = 3l/4 = 3×5/4 = 3.75 m.
14 - Question
Water table should be at least __________ m below subgrade.
a) 1.5m
b) 3 m
c) 1.2 m
d) 2.5 m
View Answer
Answer: c
Explanation: The top level of water table should be below the level of subgrade. Water table should be at least 1.2 metres below subgrade. If the soil is impermeable, the longitudinal and transverse drains have to be provided to lower the water table.
15 - Question
Torsteel is an example of _______
a) Elasticity
b) Plasticity
c) Malleability
d) Ductility
View Answer
Answer: d
Explanation: Ductility is one of the mechanical properties of materials. It is defined as the property possessed by the material by which material can be drawn into thin wires after undergoing deformation without any rupture. Torsteel is an example of ductility property.
16 - Question
Strength of Materials MCQs Analyse Indeterminate Beam
A beam which is supported on more than two supports is called as______
a) Fixed beam
b) Continuous beam
c) Cantilever beam
d) Simply supported beam
View Answer
Answer: b
Explanation: A beam which is supported on more than two supports is known as a continuous beam. The intermediate supports of a continuous beam are always subjected to some bending moment.
17 - Question
Which of the following them is also known as multi span beam _______
a) Cantilever beam
b) Simply supported beam
c) Fixed beam
d) Continuous beam
View Answer
Answer: d
Explanation: A continuous beam is a beam which is supported on more than two supports. It is also known as multi span beam. The degree of indeterminacy depends upon the number of supports and nature of supports.
18 - Question
In deflection of a continuous beam, when loaded there will be convexity upwards over _________ supports.
a) End
b) Alternate
c) Intermediate
d) Every
View Answer
Answer: c
Explanation: When a continuous beam is loaded, the deflection of the beam takes place along the intermediate supports with convexity upwards.
19 - Question
The _________ is more over the supports then at midspan in continuous beams.
a) Slope
b) Bending moment
c) Deflection
d) Shear force
View Answer
Answer: b
Explanation: The bending moment is more over the supports then at midspan in case of continuous beams and hence the weight of the beam does not materially affect the stresses in the beam.
20 - Question
Moment distribution method is also known as __________
a) Hardy Cross method
b) Macaulay’s method
c) Mohr’s Theorems method
d) Kennedy’s theory
View Answer
Answer: a
Explanation: The moment distribution method is evolved by professor Hardy cross in 1932 and can be used with advantage to analyse statically indeterminate structures and frames with rigid joint this method is simple and involves a process of relaxation.
21 - Question
Which of the following device is not based on Bernoulli’s equation?
a) Venturimeter
b) Orificemeter
c) Hydraulic lift
d) Pitot tube
View Answer
Answer: c
Explanation: Bernoulli’s equation is applied to incompressible liquid flow where energy consideration is involved. Some of the hydraulic devices which are based on Bernoulli’s equation are venturimeter, orificemeter, Pitot tube.
22 - Question
Pascal’s law is applied in ____________
a) Pitot tube
b) Hydraulic lift
c) Orificemeter
d) Venturimeter
View Answer
Answer: b
Explanation: Hydraulic lift is an example of Pascal’s law. According to Pascal’s law the “At a given point, the force is applied in all directions” and the rest are the examples of Bernoulli’s equation.
23 - Question
Which of the following devices measures the velocity of flow?
a) Pitot tube
b) Venturimeter
c) Orificemeter
d) Hydraulic jacks
View Answer
Answer: a
Explanation: A pitot tube is a device which is used for measuring the velocity of flow at any point in a pipe or channel. It is based on the principle that if the velocity of flow at any point becomes zero, the pressure there is increased due to the conversion of kinetic energy into pressure energy.
24 - Question
Which of the following is the coefficient of pitot tube?
a) 0.96
b) 0.98
c) 0.97
d) 0.95
View Answer
Answer: b
Explanation: The velocity (V) = Cv (2gh)1/2.
Where Cv = coefficient of pitot tube = 0.98
h= difference between liquid levels in the pitot tube and piezometer.
25 - Question
Bernoulli’s equation is applicable only for ___________ flow.
a) Rotational
b) Steady
c) Compressible
d) Unsteady
View Answer
Answer: b
Explanation: The Bernoulli’s equation has been derived on the assumption that the velocity is uniform over the section. The Bernoulli’s equation is applicable only for steady, incompressible and irrotational flows.
26 - Question
Flow of water when a tap is just open is an example of __________ flow.
a) Uniform
b) Steady
c) Un steady
d) Turbulent
View Answer
Answer: c
Explanation: The flow is said to be unsteady if at any point in flowing liquid any one or all flow characteristics change with time liquid that is flowing at a changing rate as in the case. The flow in the tap is just opened is a perfect example for unsteady flow.
27 - Question
A Straight cantilever of uniform area carries a udl over its entire length. If the free end of a cantilever is now prop at the level of the fixed end, the vertical force required at the prop be __________
a) 3/4 W
b) 3/8 W
c) 5/8 W
d) W
View Answer
Answer: b<br/>
Explanation: Where, total load on beam = W = wl
Wl3/8EI = B×l3 / 3EI
Reaction at B = 3W/8.
28 - Question
____________ is used to empty a tank of water having no outlet.
a) Venacontracta
b) Syphon
c) Summit
d) Dyne
View Answer
Answer: b
Explanation: A syphon is used to connect two different elevations separated by a mountain
They alsoFind out the elongation of a tie of 2m long, if the axial rigidity is 5000 × 104 mm2. The axial pull be 20 kN.
a) 0.8 mm
b) 0.6 mm
c) 0.5 mm
d) 1mm used to supply water to a town over a ridge and supply type of water having an outlet.
29 - Question
Find out the elongation of a tie of 2m long, if the axial rigidity is 5000 × 104 mm2. The axial pull be 20 kN.
a) 0.8 mm
b) 0.6 mm
c) 0.5 mm
d) 1mm
View Answer
Answer: a
Explanation: Axial pull 20000N.
Elongation : Pl/ AE
Change in length = PL/ AE
= 20×10/500×11÷103.
30 - Question
Glass is an example of _________
a) Elastic
b) Brittle
c) Toughness
d) Hardness
View Answer
Answer: b
Explanation: Brittleness is a property of a material by which It Breaks without much deformation produce his property generally considered to be highly objectionable in engineering.
31 - Question
Strength of Materials MCQs Deflection of Continuous Beam
The maximum negative bending moment in fixed beam carrying udl occurs at ________
a) Mid span
b) 1/3 of the span
c) Supports
d) Half of the span
View Answer
Answer: c
Explanation: In case of fixed beam subjected to gravity loads maximum hogging or negative bending moment develops at the supports. At centre, the maximum bending moment is reduced.
32 - Question
A fixed beam of the uniform section is carrying a point load at the centre, if the moment of inertia of the middle half portion is reduced to half its previous value, then the fixed end moments will ______
a) Increase
b) Remains constant
c) Decrease
d) Change their direction
View Answer
Answer: a
Explanation: The flexural rigidity value is reduced in middle half portion of the second case fixed end moments which have developed in a beam section will be increases.
33 - Question
In propped cantilevers, the prop reaction is 3/8 wl.
a) True
b) False
View Answer
Answer: a
Explanation: In propped cantilever beam net deflection at fixed end is zero therefore Rl3/3EI = wl4/8EI
R= 3wl/8.
34 - Question
A propped cantilever beam carrying total load “W” distributed evenly over its entire length calculate the vertical force required in the prop.
a) 3/4 W
b) W
c) 5/8 W
d) 3/8 W
View Answer
Answer: d<br/>
Explanation: Therefore Total load on beam = W = wl
Rl3/3EI = Wl3/ 8EI.
R = 3W/8.
The vertical force required at the prop is 3W/8.
35 - Question
_____ is a small opening made in the bottom or sides of a tank.
a) Mouthpiece
-
- b) Orifice
-
- c) Sill
- d) Sluice
View Answer
Answer: b
Explanation: An orifice is defined as a small opening of any cross sections such as circular, square, triangular& rectangular etc. made in the walls or the bottom of a tank containing liquid in it through which the liquid flows.
36 - Question
A mouthpiece is a short length of a pipe which is not more than __________ times its diameter.
a) 3-4
b) 5-6
c) 1 -2
d) 2-3
View Answer
Answer: d
Explanation: A mouth piece is defined as a short length of a pipe which is not more than two or three times its diameter, fitted to an orifice of same diameter provided especially in a tank containing liquid.
37 - Question
The section which has a minimum cross sectional are in a flow is known as _______
a) Vena contracta
b) Thyrocade
c) Submergent
d) Upstream edge
View Answer
Answer: a
Explanation: The section of the jet, at which the flow in a liquid has a minimum cross sectional area, is known as vena contracta. This is due to the fact that liquid particles do not change their directions abruptly.
38 - Question
Bell mouthed orifices can be categorised in according to ___________
a) Size
b) Shape
c) Shape of upstream
d) Nature of discharge
View Answer
Answer: c
Explanation: The orifices are classified on the basis of their size, shape, shape of upstream edge and discharge conditions. According to shape of the upstream edge, the orifices are classified as sharp edged orifice and Bell mouthed orifice.
39 - Question
Which of the following is not a hydraulic coefficient?
a) Coefficient of contraction
b) Coefficient of discharge
c) Coefficient of viscosity
d) Coefficient of velocity
View Answer
Answer: c
Explanation: Coefficient of viscosity can be defined as the shear stress required producing unit rate of angular deformation. It is also called as dynamic viscosity.
40 - Question
Theorotical velocity = _______
a) (2gh)1/3
b) (2gh)1/2
c) (2gh)1/4
d) 2gh
View Answer
Answer: b
Explanation: The coefficient of velocity the ratio of actual velocity of the liquid to the theoretical velocity. Theoretical velocity = (2gh)1/2.
Where h = liquid head above the centre of orifice.
41 - Question
The value of Cv varies _______ to ________
a) 0.95 – 0.99
b) 0.93 – 0.95
c) 0.97 – 1
d) 0.94 – 0.96
View Answer
Answer: a
Explanation: The value of coefficient of velocity (Cv) vary from 0.95 to 0.99 for different orifices depending on shape, size of the orifices and the head under which floor takes place.
42 - Question
The Cv taken for sharp edged orifice generally is _________
a) 0.97
b) 0.98
c) 0.95
d) 0.99
View Answer
Answer: b
Explanation: The Cv taken for sharp edged orifice generally is 0.98.
Value For Sharp edged orifice Hydraulic coefficient
0.98 Cv
0.64 Ca
0.62 Cd
43 - Question
Coeffecient of discharge varies from ___________ to __________
a) 0.64 to 0.68
b) 0.61 to 0.65
c) 0.63 to 0.67
d) 0.67 to 0.7
View Answer
Answer: b
Explanation: Coefficient of discharge is defined as the ratio between actual discharge from an orifice and its theoretical discharge. It varies from 0.61 to 0.65.Generally, the value for Cd = 0.62 Sir sharp edged orifice.
44 - Question
The relation between hydraulic coefficients is Cd = Cc × Cv.
a) False
b) True
View Answer
Answer: b
Explanation: Cd = Qa / Qth
But Qa = ac V =(Cc a) × Cv × (2gh)1/2.
Qth = a Vth
Cd = Qa Qth = Cc a × Cv (2gh)1/2/a × (2gh)1/2.
Cd = Cc × Cv.
45 - Question
Calculate the actual velocity of jet if the coefficient of velocity is 0.97. The head of water on the orifice of diameter 2 cm is 6 m.
a) 11 m/s
b) 12 m/s
c) 10.5 m/s
d) 13 m/s
View Answer
Answer: c
Explanation: We know that quotient of velocity the ratio of actual velocity to theoretical velocity. The actual velocity of jet Va = Cv × (2gh)1/2.
Va = 0.97 (2× 9.81 ×6 )1/2.
Va = 10.5 m/s.