Engineering Questions with Answers - Multiple Choice Questions

MCQs on Deflection of Cantilever

1 - Question

The ratio of maximum deflection of a beam to its ___________ is called stiffness of the beam.
b) Slope
c) Span
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.

2 - Question

Stiffness of the beam is inversely proportional to the _____ of the beam.
a) Slope
b) Support reaction
c) Deflection

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.

3 - Question

The maximum ____ should not exceed the permissible limit to the span of the beam.
a) Slope
b) Deflection
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.

4 - Question

In cantilever beam the deflection occurs at ______
a) Free end
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.

5 - Question

The maximum deflection in cantilever beam of span “l”m and loading at free end is “W” kN.

a) Wl3/2EI
b) Wl3/3EI
c) Wl3/4EI
d) Wl2/2EI

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.

6 - Question

In an ideal fluid, the ____________ stresses are pretend to be absent.
a) Bending
b) Shearing
c) Tensile
d) Compressive

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.

7 - Question

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.

8 - Question

_______ fluids are practical fluids
a) Ideal
b) Real
c) Vortex
d) Newtonian

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.

9 - Question

Specific weight of water at 4°C is ____________ N/m3.
a) 9810
b) 9760
c) 9950
d) 9865

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.

10 - Question

The inverse of specific weight of a fluid is __________
a) Specific gravity
b) Specific Volume
c) Compressibility
d) Viscosity

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.

11 - Question

Calculate the specific gravity of mercury.
a) 12.5
b) 14.7
c) 13.6
d) 11.8

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
S= 13.6.

12 - Question

Specific gravity of water is __________
a) 0.8
b) 1
c) 1.2
d) 1.5

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.

13 - Question

Compute the maximum deflection at free end of a cantilever beam subjected to udl for entire span of l metres.
a) wl4/8EI
b) wl4/4EI
c) wl3/8EI
d) wl2/6EI

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.

14 - Question

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.
a) 0.052m
b) 0.063m
c) 0.076m
d) 0.09m

Explanation: For cantilever beams with udl on entire span, the maximum deflection = wl4/8EI
y = wl4/8EI = 25 × 34/ 8 × 4000 = 0.063m.

15 - Question

Which of the following is not an example of Malleability?
a) Wrought Iron
b) Ornamental silver
c) Torsteel
d) Ornamental gold