MACHINE DESIGN MOCK TEST

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MACHINE DESIGN MOCK TEST - II

This Test series useful for who are preparing for various technical examinations like TRB Mechanical, TNEB-AE, TNPSC-AE, SSC-JE, NLC GET, GATE, ESE and State PSC and entrance exams like TANCET.

For marking a leak proof joint, the bolts or studs are screed up tightly along with metal gasket or asbestos packing. The minimum diameter of the bolt or stud (used for this purpose) should be atleast

1 point

5 mm

16 mm

24 mm

10 mm

Clear selection

Which of the following is correct for self-locking screw?

1 point

The co-efficient of friction is half of the tangent of the helix angle

The co-efficient of friction is less than the tangent of the helix angle.

The co-efficient of friction is equal to or greater than tangent of the helix angle

The co-efficient of friction is twice of the tangent of the helix angle

Clear selection

2 points

1 and 3

2, 3 and 4

1,2, 3 and 4

2 and 3

Clear selection

When the deformation of a machine number is due to bending only, the maximum bending moment is given by M = fZ in which

1 point

f is the maximum shear stress and Z is polar modulus of section

f is the maximum compressive stress and Z is polar modulus of section

f is the maximum tensile stress and Z is modulus of section

f is the maximum compressive or tensile stress and Z is modulus of section

Clear selection

Which one of the curves shown below in fig. represents the characteristic of hydro-dynamically lubricated journal bearing?

1 point

Clear selection

In case of flanged pipe joint to make the joint leak proof the circumferential pitch of the bolts should be Where d = diameter of the bolt hole

1 point

More than 30√d and diameter of bolt less than 16 mm

Between 20√d and 30√d and diameter of bolt more than 16 mm

More than 20√d and diameter of bolt less than 16 mm

Less than 20√d and diameter of bolt less than 16 mm

Clear selection

Stress concentration in a machine component of a ductile material is not so harmful as it is an brittle material because

1 point

In ductile material local yielding may distribute stress concentration

Poisson’s ratio is larger in ductile materials

Modulus of rigidity is larger in ductile materials

Ductile material has larger Young’s material

Clear selection

Which one of the following sets of parameters should be monitored for determining safe operation of journal bearing?

1 point

Oil Pressure, Bearing metal temperature and bearing vibration

Bearing metal temperature and oil pressure

Oil pressure and bearing vibrations

Bearing vibration, Oil Pressure and speed of shaft

Clear selection

Which of the following pair is correctly matched?

1 point

Sunk key – made from a cylindrical disc having segmental cross-section

Wood-ruff key - which is flat on the shaft and fits in a key way in the hub

Saddle key – which fits half in the key way of the hub and half in the key way of the shaft

None of the above.

Clear selection

The permissible stress in a fillet weld is 100N/mm^2. The fillet weld has equal leg lengths of 15 mm each. The allowable shearing load on weldment per cm length of the weld is

1 point

15.0 kN

7.5 kN

10.6 kN

22.5 kN

Clear selection

Which of the bearing given below should not be subjected to a thrust load?

1 point

Angular contact ball bearing

Cylindrical (straight) roller bearing

Deep groove ball bearing

Single row tapered roller bearing

Clear selection

A locking device, in which slots are cut in a cylindrical collar provided on the top of the nut on opposite faces and a split pin passes through the two slots in the nut and a hole in the bolt, is known as

1 point

Slotted nut

Castle nut

Sawn nut

Ring nut

Clear selection

Match the List – I with List – II and select the correct answer using codes given below the lists

2 points

A – 2; B – 4; C – 5; D – 3;

A – 1; B – 5; C – 2; D – 3;

A – 2; B – 4; C – 1; D – 3;

A – 1; B – 4; C – 2; D – 3;

Clear selection

A 60 mm long and 6 mm thick fillet weld carries a steady load of 15 kN along the weld. The shear strength of the weld material is equal to 200 Mpa. The FOS is

2 points

3.4

6.8

4.8

2.4

Clear selection

The torque required to tighten the bolt comprises of the

1 point

Torque required in inducing the pre-load only

Torque required in overcoming circumferential hoop stress

Torque required in overcoming thread friction only

Torque required in overcoming thread friction and inducing pre-load and also the torque required to overcome collar friction between the nut and the washer

Clear selection

Efficiency of joint is

1 point

(Strength of joint)/(Strength of solid plate)

(Strength of solid plate)/(Strength of joint)

(Strength of joint)/(Strength of fastener)

None of the above

Clear selection

An allen bolt is

1 point

Provided with counter sunk head

Provided with hexagonal depression in head

Self-locking bolt

High speed bolt

Clear selection

A machine component is subjected to a flexural stress, which fluctuates between 300 MN/m^2 and -150 MN/m^2. Taking the yield strength = 0.55 of the ultimate strength, endurance strength = 0.5 of the ultimate strength and factor of safety to be 2, the value of the minimum ultimate strength according to modified Goodman relation will be

2 points

1075 MN/m^2

1100 MN/m^2

1025 MN/m^2

1050 MN/m^2

Clear selection

The percentage improvement in power capacity of a flat belt drive, when the wrap angle at the driving pulley is increased from 150° to 210° by an idler arrangement for a friction coefficient of 0.3 is

2 points

33.92

25.21

67.85

40.17

Clear selection

If the dynamic load capacity of a ball bearing is increased to 1.5 times its earlier value without changing its equivalent load the life of the bearing increases to

1 point

4.2 times its earlier life

6.4 times its earlier life

5.2 times its earlier life

3.4 times its earlier life

Clear selection

Choose the correct statement

1 point

Stress concentration factor is independent of the geometry of the machine component

Endurance limit of material subjected to fatigue loading depends on the surface finish and ultimate tensile strength of material

For a mirror polished material, the surface finish factor is 0.5

Fatigue is the failure of a material above the yield point

Clear selection

Which of the following has threads at both ends?

1 point

Bolt

Stud

Screw

Tap bolt

Clear selection

The circumferential stress induced in the material of a thick cylinder, subjected to an internal pressure of intensity p, is

1 point

Having maximum stress at the outer radius and minimum stress at the inner radius

Having maximum stress at the inner radius and minimum stress at the outer radius

Uniformly distributed across the thickness of the wall

None of the above

Clear selection

In a multiple disc clutch, the axial intensity of pressure is not to exceed 0.2 MPa the inner radius of the discs is 100 mm and is half the outer radius. The axial force per pair of contact surface in N is

1 point

2000π

4000π

3000π

6000π

Clear selection

Ball bearing type screws are found in following applications

1 point

Crane

Aeroplane engines

Steering mechanism

Screw jack

Clear selection

Submit

Clear form

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