Home
Current Affairs January 2024

What is the correct answer?

4

The velocity factor for very accurately cut and ground metallic gears operating at velocities upto __________ are equal to 6/(6 + v).

A. 10 m/s

B. 12.5 m/s

C. 15 m/s

D. 20 m/s

Correct Answer :

D. 20 m/s


Related Questions

What is the correct answer?

4

The helix angle for double helical gears may be made up to

A. 45°

B. 60°

C. 75°

D. 90°

What is the correct answer?

4

In a full journal bearing, the angle of contact of the bearing with the journal is

A. 120°

B. 180°

C. 270°

D. 360°

What is the correct answer?

4

When a beam of rectangular cross-section of width b and depth d, is subjected to a shear force F, the maximum shear stress induced will be

A. F/bh

B. 3F/2bh

C. 2F/bh

D. 4F/bh

What is the correct answer?

4

According to Indian standard specifications, 100 H6/g5 means that

A. Tolerance grade for the hole is 6 and for the shaft is 5

B. Tolerance grade for the shaft is 6 and for the hole is 5

C. Tolerance grade for the shaft is 4 to 8 and for the hole is 3 to 7

D. Tolerance grade for the hole is 4 to 8 and for the shaft is 3 to 7

What is the correct answer?

4

When the screw in a mechanical screw jack rotates, the load kept on the top of it moves

A. Axially upwards

B. Axially downwards

C. Axially upwards or downwards

D. None of these

What is the correct answer?

4

In second type of levers,

A. Load is in between the fulcrum and effort

B. Effort is in between the fulcrum and load

C. Fulcrum is in between the load and effort

D. None of these

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

When the bearing is subjected to large fluctuations of load and heavy impacts, the bearing characteristic number should be _________ the bearing modulus.

A. 10 times

B. 5 times

C. 15 times

D. 20 times

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 included angle for the British Association thread is

A. 29°

B. 55°

C. 47.3°

D. 60°

What is the correct answer?

4

The shock resistance of steel is increased by adding

A. Nickel

B. Chromium

C. Nickel and chromium

D. Cobalt and molybdenum

What is the correct answer?

4

A backing ring is used inside the pipe joint when making a

A. Butt weld

B. Fillet weld

C. Sleeve weld

D. Socket weld

What is the correct answer?

4

A bolt of uniform strength can be developed by

A. Keeping the core diameter of threads equal to the diameter of unthreaded portion of the bolt

B. Keeping the core diameter smaller than the diameter of the unthreaded portion

C. Keeping the nominal diameter of threads equal to the diameter of unthreaded portion of the bolt

D. None of the above

What is the correct answer?

4

The pitch of threads on a Jock nut in comparison to pitch of nut is

A. Same

B. Coarser

C. Finer

D. Very fine

What is the correct answer?

4

A type of brake commonly used in motor cars is a

A. Shoe brake

B. Band and block brake

C. Band brake

D. Internal expanding brake

What is the correct answer?

4

In case of thick cylinders, the tangential stress across the thickness of cylinder is

A. Maximum at the outer surface and minimum at the inner surface

B. Maximum at the inner surface and minimum at the outer surface

C. Maximum at the inner surface and zero at the outer surface

D. Maximum at the outer surface and zero at the inner surface

What is the correct answer?

4

The coefficient of friction between the belt and pulley depends upon the

A. Material of belt and pulley

B. Slip of belt

C. Speed of belt

D. All of these

What is the correct answer?

4

In a horizontal flat belt drive, it is customary to use

A. Bottom side of belt as slack side

B. Top side of belt as slack side

C. Idler pulley

D. None of the above

What is the correct answer?

4

The circumferential and longitudinal strains in a cylindrical boiler under internal steam pressure are εc and εl respectively. The change in volume of the boiler cylinder per unit volume will be

A. εc + 2εl

B. c + εl

C. εc + εl²

D. εc² + εl

What is the correct answer?

4

A spring of stiffness 1000 N/m is stretched initially by 100 mm from the undeformed position. The work required to stretch it by another 100 mm is

A. 5 N-m

B. 7 N-m

C. 10 N-m

D. 15 N-m

What is the correct answer?

4

Rankine's theory is used for

A. Brittle materials

B. Ductile materials

C. Elastic materials

D. Plastic materials

What is the correct answer?

4

The flank of the tooth is the

A. Surface of the top of the tooth

B. Surface of the tooth above the pitch surface

C. Width of the tooth measured along the pitch circle

D. Surface of the tooth below the pitch surface

What is the correct answer?

4

When the connected members are very yielding (soft gasket) as compared to the bolt, then the resultant load on the bolt will be equal to the

A. Initial tension

B. External load applied

C. Sum of the initial tension and external load applied

D. Initial tension or external load, whichever is greater

What is the correct answer?

4

In hydrostatic 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

What is the correct answer?

4

Which one of the following loading is considered for the design of axles?

A. Bending moment only

B. Twisting moment only

C. Combined bending moment and twisting moments

D. Combined action of bending moment, twisting moment and axial thrust

What is the correct answer?

4

The edges of a boiler plate are bevelled to an angle of

A. 30°

B. 45°

C. 60°

D. 80°

What is the correct answer?

4

Which is correct statement? Stress concentration in static 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

In a marine flange coupling, the pitch circle diameter of bolts is taken as

A. 1.2 d

B. 1.6 d

C. 2d

D. 2.5 d

What is the correct answer?

4

Auto frettage is the method of

A. Joining thick cylinders

B. Calculating stresses in thick cylinders

C. Pre-stressing thick cylinders

D. Increasing the life of thick cylinders

What is the correct answer?

4

While designing a screw in a screw jack against buckling failure, the end conditions for the screw are taken as

A. Both the ends fixed

B. Both the ends hinged

C. One end fixed and the other end hinged

D. One end fixed and the other end free