Home
Current Affairs January 2024

What is the correct answer?

4

Which process will increase the fatigue duration of parts?

A. Finishing and polishing

B. Shotpeening

C. De-carburisation

D. Electroplating

Correct Answer :

B. Shotpeening


Related Questions

What is the correct answer?

4

The notch sensitivity q is expressed in terms of fatigue stress concentration factor Kf and theoretical stress concentration factor Kt as

A. (Kf + 1)/ (Kt + 1)

B. (Kf - 1)/ (Kt - 1)

C. (Kt + 1)/ (Kf + 1)

D. (Kt - 1)/ (Kf - 1)

What is the correct answer?

4

A bolt of M 24 × 2 means that

A. The pitch of the thread is 24 mm and depth is 2 mm

B. Cross-sectional area of the threads is 24 mm²

C. The nominal diameter of bolt is 24 mm and pitch is 2 mm

D. The effective diameter of bolt is 24 mm and there are 2 threads per cm

What is the correct answer?

4

A tapered key which fits in a key way in the hub and the bottom of which is shaped to fit the curved surface of the shaft, is known as,

A. Hollow saddle key

B. Hollow key

C. Soft key

D. None of these

What is the correct answer?

4

The property of a material which enables it to be drawn into wires with the application of a tensile force, is called

A. Plasticity

B. Elasticity

C. Ductility

D. Malleability

What is the correct answer?

4

Which of the following spring is used in mechanical wrist watch?

A. Helical compression spring

B. Spiral spring

C. Torsion spring

D. Belleville spring

What is the correct answer?

4

The dedendum is the radial distance from the

A. Pitch circle to the top of a tooth

B. Pitch circle to the bottom of a tooth

C. Top of a tooth to the bottom of a tooth

D. Addendum circle to the clearance circle

What is the correct answer?

4

Which of the following property is essential for spring materials?

A. Stiffness

B. Ductility

C. Resilience

D. Plasticity

What is the correct answer?

4

In a flat belt drive, if the slip between the driver and belt is 1 %, between the belt and follower is 3% and driver and follower pulley diameters are equal, then velocity ratio of the drive will be

A. 0.96

B. 0.97

C. 0.98

D. 0.99

What is the correct answer?

4

Eulers formula for a mild steel column is not valid if the slenderness ratio is

A. 90

B. 60

C. 120

D. 100

What is the correct answer?

4

If p = bearing pressure on projected bearing area, z = absolute viscosity of lubricant, and N = speed of journal, then the bearing characteristic number is given by

A. ZN/p

B. p/ZN

C. Z/pN

D. N/Zp

What is the correct answer?

4

Which of the following statement is wrong for a connecting rod?

A. The connecting rod will be equally strong in buckling about X-axis and Y-axis, if Ixx = 4 Iyy

B. If Ixx > 4 Iyy, the buckling will occur about Y-axis

C. If Ixx < 4 Iyy, the buckling will occur about X-axis

D. The most suitable section for the connecting rod is T-section

What is the correct answer?

4

18/8 steel contains

A. 18% nickel and 8% chromium

B. 18% chromium and 8% nickel

C. 18% nickel and 8% vanadium

D. 18% vanadium and 8% nickel

What is the correct answer?

4

The shearing stresses in the inner face as compared to outer face of the wire in a heavy close coiled spring is

A. Larger

B. Smaller

C. Equal

D. Larger/smaller depending on diameter of spring coil

What is the correct answer?

4

Two shafts will have equal strength, if

A. Diameter of both the shafts is same

B. Angle of twist of both the shafts is same

C. Material of both the shafts is same

D. Twisting moment of both the shafts is same

What is the correct answer?

4

The maximum efficiency of a square threaded screw is

A. (1 - sinφ)/ (1 + sinφ)

B. (1 + sinφ)/ (1 - sinφ)

C. (1 - sinφ)/ (1 + cosφ)

D. (1 + cosφ)/ (1 - sinφ)

What is the correct answer?

4

The ratio of endurance limit in shear to the endurance limit in flexure is

A. 0.33

B. 0.4

C. 0.5

D. 0.55

What is the correct answer?

4

Belt slip may occur due to

A. Heavy load

B. Loose belt

C. Driving pulley too small

D. All of the above

What is the correct answer?

4

In a steam engine, the piston rod is usually connected to the crosshead by means of a

A. Knuckle joint

B. Cotter joint

C. Oldham coupling

D. Universal joint

What is the correct answer?

4

The acme threads are usually found on

A. Spindles of bench vices

B. Railway carriage couplings

C. Feed mechanism of machine tools

D. Screw cutting lathes

What is the correct answer?

4

Whether any core is required in wire ropes

A. Yes

B. No

C. Sometimes

D. Rarely

What is the correct answer?

4

In nitrated parts, the origins of the fatigue cracks will occur at

A. Surface

B. Just below the surface

C. Within the core

D. None of the above

What is the correct answer?

4

A localised compressive stress at the area of contact between two members is known as

A. Tensile stress

B. Bending stress

C. Bearing stress

D. Shear stress

What is the correct answer?

4

A locking device extensively used in marine type connecting rod ends is a

A. Jam nut

B. Castle nut

C. Sawn nut

D. Ring nut

What is the correct answer?

4

The property of a bearing material which has the ability to accomodate shaft deflections and bearing inaccuracies by plastic deformation without excessive wear and heating, is known as

A. Bondability

B. Embeddability

C. Comformability

D. Fatigue strength

What is the correct answer?

4

The taper on a rectangular sunk key is

A. 1 in 16

B. 1 in 32

C. 1 in 48

D. 1 in 100

What is the correct answer?

4

The draw of cotter should not be more than

A. 3 mm

B. 6 mm

C. 8 mm

D. 12 mm

What is the correct answer?

4

The arms of the pulleys for flat belt drive have

A. Elliptical cross-section

B. Major axis in plane of rotation

C. Major axis twice the minor axis

D. All the three characteristics

What is the correct answer?

4

In skew bevel gearing, the axes of shafts are

A. Intersecting and the teeth are curved

B. Non-intersecting and nonparallel and the teeth are curved

C. Non-intersecting and non-parallel and the teeth are straight

D. None of the above

What is the correct answer?

4

Which is correct statement? Stress concentration in cyclic loading is

A. Very serious in brittle materials and less serious in ductile materials

B. Very serious in ductile materials and less serious in brittle materials

C. Equally serious in both types of materials

D. Seriousness would depend on other factors

What is the correct answer?

4

A column is known as a long column if the slenderness ratio is

A. 40

B. 50

C. 70

D. 100