General Mechanical Engineering, Question Paper of B.Tech AE (D) 4th Semester, Download Previous Years Question Paper 4

Roll no. 

GENERAL MECHANICAL ENINEERING

4^th Exam/Auto/9308/Dec’10

Duration :03 Hrs.

Note : Attempt any five questions. Question no. 1 is compulsory.

1.     Fill in the blanks

a.     The ratio of lateral strain to linear strain is known as ___

b.     Factor of safety = ____

c.      A beam supported on more than two supports is known as _---

d.     The negative B.M is also known as ____

e.      The unit of M.O.I is _____

f.       The bending stress on the neutral axis if ____

g.     In case of a cantilever tensile stress are induced _____ the neutral axis.

h.     Maximum bending stress in a beam is at the ____ fibers.

i.       The circumferential stress in as ___ the longitudinal stress.

j.       Torque produces _____ stress in the shaft. 

2.       

a.     Explain the terms:- young’s Modulus, Passion ratio, Modulus of rigidity and Hooke’s law.

b.     A rod 20mm in diameter &   2m long is subjected to an axial pull of  35KN. If the young modulus of elasticity of the material of the rod  is 210GN/M,

                                                             i.      Stress

                                                           ii.      Strain.

                                                        iii.      Elongation of the rod.

3.      

a.     Write assumption used in bending in beams

b.     A rectangular beam 300mm deep & 150 mm wide is simply supported over a span of 8m find the max. U.D.L that the beam can carry, if the bending stress is not to exceed 120N/mm2.

4.       

a.     Explain the sign convention used in B.M

b.     Draw the S.F & B.M diagram for the beam shown in fig.

5.       

a.     Write assumption used in tensional equation and define tensional rigidity.

b.     A solid shaft of 100mm diameter is to transmit 160KW at 100  rpm find the angle of twist for a length of 6m if the max. torque exceeds the mean by 40% take C = 8X10 N/mm2

6.       

a.     Write difference between wheel and governor

b.     What do you mean by higher pair & lower pair. Write example of each.

c.      What are the causes of vibration.

7.     Explain any three of the followings:

a.     Static balancing.

b.     Inversion of mechanism

c.      Helical springs.

d.     Laminated springs. 

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General Mechanical Engineering, Question Paper of B.Tech AE (D) 4th Semester, Download Previous Years Question Paper 3

Roll no. 

GENERAL MECHANICAL ENINEERING

4^th Exam/Auto/9308/May’10

Duration :03 Hrs.

Note : Attempt any five questions. Question no. 1 is compulsory.

1.       

a.     ___ spring is made up of wire coiled into a helix.

b.     Maximum B.M occurs when S.F _____

c.      Hooks law holds good up to ____

d.     The units of moment of inertia of a plane area is in _____

e.      _____ is a beam whose both ends are fixed

f.       The unit of section modulus is _____

g.     Torque produces __________ stress in the shaft

h.     Spring is used to absorb energy due to __

i.       In a kinematics chain, when one of its link is ____ it is called a mechanism.

j.       The governors are broadly classified as _____ governors and ___ governors.

2.       

a.     Explain the harmful effect of vibrations?

b.     What are the causes of vibrations?

3.      

a.     Differentiate between static and dynamic balancing?

b.     Explain balancing of single rotating mass by a single mass rotating in same plane?

4.        

a.     Explain the principle and working of porter governor?

b.     Compare fly wheel and governor.

5.       

a.     Define the following

                                                             i.      Shear force

                                                           ii.      Bending moment

                                                        iii.      Point of contra flexure

b.     A cantilever of length 4cm carries of uniformly distributed load of 3KN/m length over a whole length and a point load of 4kn at he free end. Draw the shear force and bending moment diagram

6.       

a.     What do you mean by radius of gyration?

b.     Find the moment of inertia of a retrungular section shown in fig. about the axis xx passing through centroiod G . Calculate radius of gyration and section modulus Z,xx also calculate moment of inertia about base

7.     An air drum is made of 10 mm thick plate. The diameter of shell is 3m. the efficiency of longitudinal and circumferential joints are 80% and 45 % respectively. If the tensile stress in the plate is limited to 100N/mm2, find the maximum safe air pressure

a.     Define the following

b.     Factor of safety

c.      Working stress   

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General Mechanical Engineering, Question Paper of B.Tech AE (D) 4th Semester, Download Previous Years Question Paper 2

Roll no. 

GENERAL MECHANICAL ENINEERING

4^th Exam/Auto/9308/May’07

Duration :03 Hrs.

Note : Attempt any five questions. Question no. 1 is compulsory.

1.       

a.     What do you mean by factor of safety?

b.     MOI of a rectangle about its base is ______

c.      A beam whose both ends are fixed is called ____

d.     A load acting of a point is called a ____

e.      Define radius of gyration.

f.       What is UDL?

g.     Define static balancing.

h.     Define polar modulus of the shaft.

i.       The circumferential stress is ___ the longitudinal stress.

j.       Write torsion equation.

k.     Function of a governor is to control the supply of _______

l.       The ball and socket joint forms a _____ pair.

m.  Define solid length of a spring.

n.     The moment of inertia of a flywheel is _______

o.     In case of free vibration, there is no ______

Section –B

2.       

a.     Explain section modulus for rectangle and for circular section.

b.     Find the dia. Of circular shaft of a simply supported shaft 6 m span which carries an 81 KN weight due to pulley mounted at the centre of span. If permissible bending stress of the shaft materiel is limited to 8.4 mPa.

3.       

a.     Explain different types of beam.

b.     A T section has flange of 200 mm x 12mm, web of 350 mm x 10mm, overall depth 362 mm calculate the moment of inertia about its controidal axis

4.      

a.     What are assumption in the theory of pure torsion?

b.     A solid shaft has to transmit 75 kw at 200 rpm. Taking allowable stress at 70 mN/m2. Find suitable dia of the shaft if the maximum torque transmitted exceeds the mean by 30%

5.       

a.     Define ‘machine’ and ‘mechanism’. Explain how they are different from one another.

b.     What is a kinematic pair? Give example to explain the difference between the lower and higher pair.

6.      

a.     What are centrifugal and inertia types of governors. Which is preferred and why?

b.     Explain the concept of balancing of rotary pats.

7.     Explain

a.     Different types of end supports

b.     Type of stresses 

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General Mechanical Engineering, Question Paper of B.Tech AE (D) 4th Semester, Download Previous Years Question Paper 1

Roll no. 

GENERAL MECHANICAL ENGINEERING

4^th Exam/Auto/9308/May’07

Duration :03 Hrs.

1.     Choose the correct answer.

a.     A piston in cylinder forms a

                                                             i.      Turning pair

                                                           ii.      Sliding pair

                                                        iii.      Rolling pair

                                                        iv.      Spherical pair

1.     The minimum possibly value of Passion’s ratio is as

a.     1

b.     0.5

c.      0.25

d.     033

2.     If diameter of circular beam is doubled, its moment of inertia becomes  

a.     Double

b.     Four times

c.      Eight times

d.     Sixteen times

Fill in the blanks –

1.     At point of contraflexine, the value o bending moment is ________

2.     If aparing is cut into two pieces of equal lengths, the stiffness of each piece becomes ______ the stiffness of original spring.

3.     The ratio of longitudinal and circumferential stresses in a seamless thin cylindrical shell equals ________

4.     In a circular beam , width is kept same and depth in doubled, its moment of inertia will be ______    

5.     If other things remaining same, the diameter of a shaft is doubled, its angle of twist will becomes ________

State true or false

1.     Ball bearing is an example of a lower pair.

2.     Bending stress at neutral axis is always maximum.

3.     Maximum bending moment on a beam reduces if the same concentrated load is distributed uniformly over it.

4.     Section modulus and moment of inertia of a circular shaft have same values.

5.     A flywheel keeps the speed fluctuation minimum by controlling the supply of fuel.

Section-B

1.     Attempt any five questions.

a.     Define : stress, strain, yield point, proof stress, plastic stage, young’s modulus of elasticity.

b.     State what you understand by moment of inertia, radius of gyration and section modulus.

c.      What is movement of resistance? Write bending equation and the meaning and SI units of each term used in this equation.

d.     Give a  comparison of solid shaft with a hollow shaft with regard to their strength and weight.

e.      Give applications of close helical springs and laminated springs. How are the number of plates of a laminated spring determined ?

f.       Give at least three example each of

                                                             i.      Lower pairs

                                                           ii.      Higher Paris

g.     Discuss the effects of moment of inertia, radius of gyration and fluctuation of energy, on the size of a flywheel.

Section –C

2.     Attempt any three questions.

a.     Draw S.F and B.M diagrams for the beam shown in fig.1 indicated all the principal values and point of centraflexture if any.

b.     Two wooden plants 150mm x 50mm each are connected to from a T-section of a beam. If a moment of 3.4 KN-m is applied on this beam inducing tensile street below the neutral axis, find the stresses at the extreme fibers of the cross –section    

c.        

                                                             i.      Write a note on balancing of reciprocating parts.

                                                           ii.      Discuss causes of vibrations, their harmful effects and remedies.

d.     What is the purpose of a governor ? how does it differ from a flywheel? Explain the construction and working of nay one of the governors.

e.      A shaft is transmitting 100 KW at 180 rpm. If the allowable streets is 60N/mm2. Determine suitable diameter for the shaft. The shaft is not to twist more than 1 in length of 3 meters. Take c= 80 Kn/mm²

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