# Be-e Mechanical System Design MCQ Test April-20

30 Questions | Total Attempts: 117  Settings Create your own Quiz TOTAL MARKS-30 TOTAL TIME: 1 HOUR

• 1.
A cylinder is considered as thin cylinder when the ratio of inner diameter to the wall thickness is,
• A.

More than 15

• B.

Less than 15

• C.

Equal to 15

• D.

None of these criteria

• 2.
A cylinder is considered as thick cylinder when the ratio of inner diameter to the wall thickness is,
• A.

More than 15

• B.

Less than 15

• C.

Equal to 15

• D.

None of these criteria

• 3.
In thin cylinders, the longitudinal stress is,
• A.

2(circumferential stress)

• B.

1/2(circumferential stress)

• C.

1/4(circumferential stress)

• D.

4(circumferential stress)

• 4.
In thick cylinders, the axial stress across the thickness of cylinder
• A.

Remains uniform throughout

• B.

varies from internal pressure at the inner surface to zero at the outer surface

• C.

Varies from maximum value at the inner surface to minimum value at the outer surface

• D.

varies from maximum value at the outer surface to minimum value at  the inner surface

• 5.
The thickness of thick cylindrical shell with closed ends and made of brittle material is determined by
• A.

Lame’s equation

• B.

Clavarino’s equation

• C.

Birnie’s equation

• D.

Barlow’s equation

• 6.
The ratio of length of stroke to cylinder bore (l/D) is usually,
• A.

1/2

• B.

5

• C.

1.5

• D.

1/4

• 7.
Connecting rod is made of,
• A.

aluminium

• B.

medium carbon steel

• C.

cast iron

• D.

babbits

• 8.
The function of piston skirt is
• A.

to provide bearing surface for side thrust

• B.

to support gas load

• C.

to support gudgeon pin

• D.

to seal the cylinder and prevent leakage of oil past piston

• 9.
The design of piston head is based on,
• A.

strength and rigidity considerations

• B.

bending and torsional moments

• C.

buckling consideration

• D.

strength and heat transfer considerations

• 10.
Cylinder thickness is calculated on the basis of
• A.

• B.

residual stress

• C.

whipping stress

• D.

circumferential hoop stress

• 11.
Automotive crankshafts are made by,
• A.

casting process

• B.

machining from rolled stock

• C.

Drop forging process

• D.

welding process

• 12.
The bolts for the cap of big end of connecting rod are subjected to
• A.

only gas force

• B.

only inertia force

• C.

only side thrust

• D.

inertia force, gas force and side thrust

• 13.
The condition for connecting rod to be equally strong in plane of motion  (XX) and a plane perpendicular to plane of motion (YY) is,
• A.

Ixx =  Iyy

• B.

Ixx = 4 Iyy

• C.

4 Ixx =  Iyy

• D.

Ixx = 2 Iyy

• 14.
Autofrettage is,
• A.

a surface coating process of cylinders for corrosion resistance

• B.

a heat treatment process for cylinders to relieve residual stresses

• C.

A process of pre-stressing the cylinder to develop residual compressive stress at the inner surface

• D.

A surface hardening process of cylinder to improve wear resistance

• 15.
Class 3 pressure vessels are to be designed according to ‘Code for unfired vessel IS-2825’ when,
• A.

operating pressure is less than 17.5 kgf/cm2

• B.

Operating temperature is more than 00C and less than 2500C

• C.

thickness of shell is less than 16 mm

• D.

Any one of the above

• 16.
The end-closure for tall vertical pressure vessel is
• A.

• B.

• C.

• D.

• 17.
The end-closure for tankers of milk, petrol or diesel is
• A.

• B.

• C.

• D.

• 18.
Weld joint efficiency is maximum when the pressure vessel is welded by
• A.

single-welded butt joint with backing strip

• B.

single-welded butt joint without backing strip

• C.

double-welded butt joint with full penetration

• D.

none of the above

• 19.
While designing pressure vessels according to ‘Code for unfired vessel IS-2825’, the design pressure is taken as
• A.

1.05(maximum operating pressure)

• B.

1.5(maximum operating pressure)

• C.

2(maximum operating pressure)

• D.

1.3(maximum operating pressure)

• 20.
The design of piston head is based on
• A.

Strength and rigidity considerations

• B.

Bending and torsional moments

• C.

buckling consideration

• D.

strength and heat transfer considerations

• 21.
Select a functional requirement Parameter from the options given
• A.

Size

• B.

Cost

• C.

Weight

• D.

Energy  Storing Capacity

• 22.
Adequate design is the design which fulfills the main.................... requirements
• A.

Cost

• B.

Concept

• C.

Dimensional

• D.

Functional

• 23.
Optimum design is...................of adequate design
• A.

Exclusive

• B.

Inclusive

• C.

Concept

• D.

None of the Above

• 24.
An optimum design means the best or most suitable of all the feasible............designs
• A.

Available

• B.

Aesthetic

• C.

Conceptual

• D.

None of these

• 25.
For a Component there can be .........adequate designs,but there is only........optimum design
• A.

No.of, Few

• B.

Many, Some

• C.

Several, One

• D.

None of these

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