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4

Fibrous fracture occurs in

A. Ductile material

B. Brittle material

C. Elastic material

D. Hard material

Correct Answer :

A. Ductile material


Related Questions

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According to Indian standard specifications, a grey cast iron designated by 'FG 200' means that the

A. Carbon content is 2%

B. Maximum compressive strength is 200 N/mm²

C. Minimum tensile strength is 200 N/mm²

D. Maximum shear strength is 200 N/mm²

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4

The belt slip occurs due to

A. Heavy load

B. Loose belt

C. Driving pulley too small

D. Any one of the above

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An open belt drive is used when

A. Shafts are arranged at right angles and rotate in one definite direction

B. Shafts are arranged parallel and rotate in the opposite directions

C. Shafts are arranged parallel and rotate in the same directions

D. Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft

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4

If the size of a standard specimen for a fatigue testing machine is increased, the endurance limit for the material will

A. Have same value as that of standard specimen

B. Increase

C. Decrease

D. None of these

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4

Machine screws are

A. Similar to small size tap bolts except that a greater variety of shapes of heads are available

B. Slotted for a screw driver and generally used with a nut

C. Used to prevent relative motion between two parts

D. Similar to stud

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4

The number of slots in a 25 mm castle nut is

A. 8

B. 4

C. 2

D. 6

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4

Whether any core is required in wire ropes

A. Yes

B. No

C. Sometimes

D. Rarely

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4

The ratio of pitch circle diameter in millimetres to the number of teeth, is called

A. Circular pitch

B. Diametral pitch

C. Module

D. None of these

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4

Stress concentration in static loading is more serious in

A. Ductile materials

B. Brittle materials

C. Equally serious in both cases

D. Depends on other factors

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4

The stiffness of a closely coiled helical spring subjected to an axial load W is equal to (where G = Modulus of rigidity, and n = Number of active coils)

A. Gd⁴/ 8D3n

B. Gd3/ 8D3n

C. Gd⁴/ 4D3n

D. Gd⁴/ 8D²n

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4

Cold working

A. Increases the fatigue strength

B. Decreases the fatigue strength

C. Has no influence on fatigue strength

D. Alone has no influence on fatigue strength

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4

In a butt welded joint, the size of weld is __________ the throat of weld.

A. 0.5 times

B. Equal to

C. 2 times

D. Double

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4

The stress in the threaded part of the bolt will be __________ as compared to the shank.

A. Same

B. Higher

C. Lower

D. None of these

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4

In hydrodynamic bearings

A. The oil film pressure is generated only by the rotation of the journal

B. The oil film is maintained by supplying oil under pressure

C. Do not require external supply of lubricant

D. Grease is used for lubrication

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4

If the centre distance of the mating gears having involute teeth is increased, then the pressure angle

A. Increases

B. Decreases

C. Remains unchanged

D. None of these

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4

The washer is generally specified by its

A. Outer diameter

B. Hole diameter

C. Thickness

D. Mean diameter

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4

A screw is said to be over hauling screw, if the

A. Friction angle is less than helix angle

B. Friction angle is more than helix angle

C. Friction angle is equal to helix angle

D. Efficiency of screw is 100%

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4

A sliding bearing in which although lubricant is present, the working surfaces __________ contact each other at least part of the time, is called boundary lubricated bearing.

A. Partially

B. Fully

C. Either A or B

D. None of these

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4

The stress induced in the belt is,

A. Tensile stress

B. Compressive stress

C. Direct shear stress

D. Torsional shear stress

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4

A steel containing upto 0.15% carbon is known as

A. Mild steel

B. Dead mild steel

C. Medium carbon steel

D. High carbon steel

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4

Which of the following property is essential for spring materials?

A. Stiffness

B. Ductility

C. Resilience

D. Plasticity

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4

In cross or regular lay ropes

A. Direction of twist of wires in strands is opposite to the direction of twist of strands

B. Direction of twist of wires and strands are same

C. Wires in two adjacent strands are twisted in opposite direction

D. Wires are not twisted

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4

In order to determine the stresses in a thin cylinder due to an internal pressure, it is assumed that

A. The effect of curvature of the cylinder wall is neglected

B. The tensile stresses are uniformly distributed over the section of the walls

C. The effect of the restraining action of the heads at the end of the pressure vessel is neglected

D. All of the above

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4

Which is correct statement?

A. A member made of steel will generally be more rigid than a member of equal load carrying ability made of cast iron

B. A member made of cast iron will generally be more rigid than a member of equal load carrying ability made of steel

C. Both will be equally rigid

D. Which one is rigid will depend on several other factors

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4

For steel, the ultimate strength in shear as compared to ultimate strength in tension is

A. 1/2

B. 1/3

C. 1/4

D. 2/3

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4

When the belt is transmitting maximum power,

A. The tension in tight side is twice the centrifugal tension

B. The tension in slack side is equal to the centrifugal tension

C. The tension in tight side is thrice the centrifugal tension

D. None of the above

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4

For circumferential joint in boilers, the type of joint used is

A. Butt joint with single cover plate

B. Butt joint with double cover plate

C. Lap joint with one ring overlapping the other

D. Any one of the above

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4

When the belt speed increases

A. Power transmitted increases

B. Power transmitted decreases

C. Power transmitted increases to a maximum value and then decreases

D. Power transmitted remains the same

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4

Allen bolts are

A. Self locking bolts

B. Designed for shock load

C. Used in aircraft application

D. Provided with hexagonal depression in head

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4

Which of the following statement is wrong?

A. A key is used as a temporary fastening

B. A key is subjected to tensile stresses

C. A key is always inserted parallel to the axis of the shaft

D. A key prevents relative motion between the shaft and boss of the pulley