Test: Solid Mechanics


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25 Questions MCQ Test GATE Civil Engineering (CE) 2023 Mock Test Series | Test: Solid Mechanics

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Test: Solid Mechanics - Question 1

According to Euler's column theory, the crippling load of a column is given by p = π2 EI/Cl2 In this equation, the value of C for a column with both ends hinged, is​

Detailed Solution for Test: Solid Mechanics - Question 1

In the formula l is the critical length. If both the end is fixed l= l/2 if both the end is hanged l= l if one end is fixed and other is hinged l= l/root2 if one end fixed other is free l= 2l Hence, in your question, option c is right.

Test: Solid Mechanics - Question 2

A strut 2.5m long is 60mm in diameter. One end of the strut is fixed while its other end is hinged. Using factor of safety 3.5, the safe compressive load for the member is:
E = 2.1 × 105 N/mm2

Detailed Solution for Test: Solid Mechanics - Question 2

Step 1: Data
Length of the column = 2500mm
Diameter of the column = 60mm
Condition = one end hinged and other end fixed
Crippling load =??
FOS=3.5
E=2.1x105N/mm2

Step 2: Calculation of moment of inertia
I = π d 4 / 64
I= π (60)4 / 64
I = 0.636X106mm4

Step 3: Calculation of  crippling load
Condition = one end hinged and other end fixed
P = 2 Π 2E I/ L2
P = 2 Π 2(2.1x105) (0.636X106) / (2500)2
P = 421.81 KN

Step 4: Calculation of safe load
Safe load = crippling load /FOS
Safe load = 421.81/3.5

Safe load = 120.52KN

Test: Solid Mechanics - Question 3

Figure shows a slender bar of area A and length pinned to immovable supports. Rise in temperature required to produce buckling of bar is

Detailed Solution for Test: Solid Mechanics - Question 3

Test: Solid Mechanics - Question 4

A solid circular compression member 50mm in diameter is to be replaced by a hollow circular section of the same material. Find the size of hollow section if internal diameter is 0.6 times external diameter.

Detailed Solution for Test: Solid Mechanics - Question 4

Test: Solid Mechanics - Question 5

A hollow alloy tube 5m with external and internal diameters equal to 40mm and 25mm respectively was found to extend by 6.4mm under a tensile load of 60kN. When tube is used as column with both ends pinned, find safe compressive load for tube. (FOS = 4)

Detailed Solution for Test: Solid Mechanics - Question 5

Test: Solid Mechanics - Question 6

Young's modulus is defined as the ratio of

Detailed Solution for Test: Solid Mechanics - Question 6

Young's modulus is a measure of the stiffness of an elastic material, and it is defined as the ratio of stress to strain. Rocks with low Young's modulus tend to be ductile and rocks with high Young's modulus tend to be brittle.

Test: Solid Mechanics - Question 7

Hollow C.I. column whose outside diameter is 200mm has thickness of 20mm. It is 7.5m long and is fixed at both ends. Find the ratio of Euler’s and Rankine’s critical loads. For C.I., σc = 550N/mm2, α = 1/1600, E = 8 × 104 N/mm2

Detailed Solution for Test: Solid Mechanics - Question 7



Test: Solid Mechanics - Question 8

Common data for 8 & 9

Beam 8m long fixed at both ends carries a UDL over whole span. Take EI = 9.5 × 109 kNmm. Find load intensity on beam:-
Q. When maximum Bending Moment should not exceed 40 kN-m.

Detailed Solution for Test: Solid Mechanics - Question 8

Test: Solid Mechanics - Question 9

Common data for 8 & 9

Beam 8m long fixed at both ends carries a UDL over whole span. Take EI = 9.5 × 109 kNmm. Find load intensity on beam:-
Q. When maximum deflection should not exceed 1/400 of the span.

Detailed Solution for Test: Solid Mechanics - Question 9

Max deflection =(1/400)×8000 => 20mm. For fixed beam with entire UDL ,Max deflection = wl'4/(384EI)= (20×384× 9.5×10'9)/(8000)'4 => 0.0178 KN /mm => 17.8 KN/m

Test: Solid Mechanics - Question 10

Vessel in the shape of spherical shell 800mm in diameter, 10mm shell thickness is completely filled with a fluid at atmospheric pressure. Additional fluid is then pumped in till pressure increases by 5 N/mm2. Find volume of this additional fluid.
μ= 0.25, E = 2 × 105 N/mm2

Detailed Solution for Test: Solid Mechanics - Question 10

Test: Solid Mechanics - Question 11

A solid shaft of 200mm diameter has the same cross-sectional area as that of hollow shaft of same material with inside diameter of 150mm. Find ratio of power transmitted by two shafts at same speed.

Detailed Solution for Test: Solid Mechanics - Question 11

 

Test: Solid Mechanics - Question 12

A hollow shaft is to transmit 300kW at 80rpm. If shear stress is not to exceed 60 N/mm2 and internal diameter is 0.6 of the external diameter, find external and internal diameters assuming maximum torque is 1.4 times the
mean torque.

Detailed Solution for Test: Solid Mechanics - Question 12

Test: Solid Mechanics - Question 13

A cast iron test beam 20mm × 20mm in section and 1m long and supported at the end fails when a central load of 640 N is applied. 
What uniformily distributed load will break a cantilever of the same material 50mm wide, 100mm deep and 2m long?

Detailed Solution for Test: Solid Mechanics - Question 13

Test: Solid Mechanics - Question 14

An I-section beam as shown, is simply supported over a span of 10m. If the maximum permissible bending stress is 80 N/mm2. What concentrated load can be carried at a distance of 3.5m from one support.

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Test: Solid Mechanics - Question 15

A 3m high pole stands as a vertical cantilever fixed at its base. It has to support a horizontal load of 10kN at its top. Find the minimum diameter required if the pole is of wood, if the permissible bending stress is  15N/mm2

Detailed Solution for Test: Solid Mechanics - Question 15

Test: Solid Mechanics - Question 16

A steel beam of solid circular section 25mm in diameter and length 1m is simply supported at both ends, and is loaded by its own weight only. If steel weights at 77000 N/m3, what is the length of the beam at which it just starts yeilding. Take Yeild stress = 207N/mm2

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Test: Solid Mechanics - Question 17

Two planes AB and BC which are at right angles carry shear stresses of intensity 17.5 N/mm2 while these
planes also carry tensile stress of 70 N/mm2 and compressive stress of 35N/mm2 respectively. Position of
principal planes is given as:- 

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Test: Solid Mechanics - Question 18

Consider 2 - D state of stress as shown:-

Coordinates of centre of Mohr’s circle is:-

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Test: Solid Mechanics - Question 19

At a point in a 2D stress system, σx = 100 N/mm, σxy 40 N/mm2. What is the radius of Mohr’s circle 
for stress drawn with scale 1cm = 10 N/mm2 ?

Detailed Solution for Test: Solid Mechanics - Question 19

Test: Solid Mechanics - Question 20

A steel bar 15mm in diameter is pulled axially by a force of 10 kN. If the bar is 250mm long, calculate the strain energy per unit volume stored by bar in (N-mm/mm3

(Esteel = 2 × 105 N/mm2)

Detailed Solution for Test: Solid Mechanics - Question 20

Test: Solid Mechanics - Question 21

Rod with coefficient of linear expansion 0.000012 per oC and E = 1 × 105 N/mm2 is 2m long at 10 oC. Expansion of rod when temperature is raised to 800C is :-

Detailed Solution for Test: Solid Mechanics - Question 21

Test: Solid Mechanics - Question 22

Brass rod 20mm in diameter is subjected to tensile load of 40 kN. Extension of rod measured with extension meter is found to be 254 divisions in 200mm. If each  division is equal to 0.001mm, the elastic modulus of brass is :-

Detailed Solution for Test: Solid Mechanics - Question 22

Test: Solid Mechanics - Question 23

The bend ABC shown in the figure carries a concentrated vertical load P at A. The horizontal deflection at A is


[Assume uniform flexural rigidity]

Detailed Solution for Test: Solid Mechanics - Question 23

Differentiating strain energy w.r.t Q will give horizontal deflection of A

 

Test: Solid Mechanics - Question 24

For the frame shown in the figure, find the horizontal deflection of the roller end D

Detailed Solution for Test: Solid Mechanics - Question 24

Test: Solid Mechanics - Question 25

Consider a beam with circular cross-section of diameter d. The ratio of the second moment of area about the neutral axis to the section modulus of the area is

Detailed Solution for Test: Solid Mechanics - Question 25

For circular cross-section,
Second moment of area of beam –πd4/64  

section modulus = πd3/32
dividing ( I ) and (2),
we get
 :. Ratio = d /2 

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