Home
Current Affairs January 2024

What is the correct answer?

4

The ratio of driving tensions for flat belts, neglecting centrifugal tension, is (where T₁, and T₂ = Tensions on the tight and slack sides of belt respectively, μ = Coefficient of friction, between the belt and pulley, and θ = Angle of contact)

A. T₁/T₂ = μθ

B. log (T₁/T₂) = μθ

C. T₁/T₂ =eμθ

D. T₁/T₂ = log μθ

Correct Answer :

C. T₁/T₂ =eμθ


Related Questions

What is the correct answer?

4

If P1 and P2 are the tight and slack side tensions in the belt, then the initial tension Pi (neglecting centrifugal tension) will be equal to

A. P1 - P2

B. P1 + P2

C. 2 × (P1 + P2)

D. [2 × (P1 + P2)] + Pc Where Pc is centrifugal tension

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

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

The strap end of a connecting rod of steam engine is joined by

A. Gib of cotter joint

B. Sleeve and cotter joint

C. Spigot socket cotter joint

D. Knuckle joint

What is the correct answer?

4

The shock absorbing capacity of a bolt can be increased by

A. Tightening it properly

B. Increasing shank diameter

C. Grinding the shank

D. Making shank diameter equal to core diameter of thread.

What is the correct answer?

4

Crowning on pulley helps

A. In decreasing the slip of the belt

B. In increasing the slip of the belt

C. To keep the belt in centre on a pulley while it is in motion

D. To increase pulley life

What is the correct answer?

4

The included angle in unified of American National threads is

A. 60°

B. 55°

C. 47°

D. 29°

What is the correct answer?

4

If a spring is cut down into two springs, the stiffness of cut springs will be

A. Half

B. Same

C. Double

D. None of the above

What is the correct answer?

4

The centre to centre distance between two consecutive rivets in a row, is called

A. Margin

B. Pitch

C. Back pitch

D. Diagonal pitch

What is the correct answer?

4

The radial distance of a tooth from the pitch circle to the top of the tooth is called

A. Addendum

B. Dedendum

C. Clearance

D. Working depth

What is the correct answer?

4

Turn buckle has

A. Right hand threads on bout ends

B. Left hand threads on both ends

C. Left hand threads on one end and right hand threads on other end

D. No threads

What is the correct answer?

4

When the bolt is very yielding as compared to the connected members, 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 replacing the V-belts, a complete set of new belts is used instead of replacing a single damaged belt because

A. Belts are available in sets

B. Only one belt cannot be fitted with other used belts

C. The new belt will carry more than its share and result in short life

D. New and old belts will cause vibrations

What is the correct answer?

4

The load cup of a screw jack is made separate from the head of the spindle to

A. Prevent the rotation of load being lifted

B. Enhance the load carrying capacity of the jack

C. Reduce the effort needed for lifting the working load

D. Reduce the value of frictional torque

What is the correct answer?

4

A special case of ductility which permits materials to be rolled or hammered into thin sheets, is called

A. Plasticity

B. Elasticity

C. Ductility

D. Malleability

What is the correct answer?

4

The yield point in static loading is __________ as compared to fatigue loading.

A. Higher

B. Lower

C. Same

D. None of these

What is the correct answer?

4

In order to remove internal stresses produced by hardening the steel, the process usually adopted is

A. Tempering

B. Normalising

C. Annealing

D. Spheroidising

What is the correct answer?

4

In the assembly of pulley, key and shaft

A. Pulley is made the weakest

B. Key is made the weakest

C. Key is made the strongest

D. All the three are designed for equal strength

What is the correct answer?

4

Resilience of a material is important, when it is subjected to

A. Combined loading

B. Fatigue

C. Thermal stresses

D. Shock loading

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

The period during which the cam follower remains at rest, when cam moves, is known as

A. Constant period

B. Fixed period

C. Dwell period

D. Idle period

What is the correct answer?

4

The bearings of heavy series have capacity ________ over the medium series.

A. 20 to 30%

B. 10 to 20%

C. 30 to 40%

D. 40 to 50%

What is the correct answer?

4

The pipe joint mostly used for pipes carrying water at low pressures is

A. Socket joint

B. Nipple joint

C. Union joint

D. Spigot and socket joint

What is the correct answer?

4

Which of the following statement is correct?

A. The distance from a point on one thread to the corresponding point on the next thread is called pitch

B. The distance which a screw thread advances axially in one rotation of the nut is called lead

C. In single start threads, lead is equal to pitch

D. All of the above

What is the correct answer?

4

Fibrous fracture occurs in

A. Ductile material

B. Brittle material

C. Elastic material

D. Hard material

What is the correct answer?

4

According to Indian standards, total numbers of tolerance grades are

A. 8

B. 12

C. 18

D. 20

What is the correct answer?

4

The expression 0.175 - 0.841/T is the Lewis form factor for

A. 14 ½° composite and full depth involute system

B. 20° full depth involute system

C. 20° stub system

D. None of the above

What is the correct answer?

4

Stress concentration is caused due to

A. Variations in load acting on a member

B. Variations in properties of materials in a member

C. Abrupt change of cross-section

D. All of these

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

Oil in journal bearing should be applied at the point where load is

A. Nil or lightest

B. Maximum

C. Average

D. Any one of the above