Home
Current Affairs January 2024

What is the correct answer?

4

A body of weight W is required to move up the rough inclined plane whose angle of inclination with the horizontal is α. The effort applied parallel to the plane is given by (where μ = tan φ = Coefficient of friction between the plane and the body)

A. P = W tan α

B. P = W tan (α + φ)

C. P = W (sin α + μ cos α)

D. P = W (cos α + μ sin α)

Correct Answer :

C. P = W (sin α + μ cos α)


Related Questions

What is the correct answer?

4

The velocity of a flat-faced follower when it has contact with the flank of a circular arc cam, is given by

A. ωR cosθ

B. ω(R - r₁) cosθ

C. ω(R - r₁) sinθ

D. ωr₁ sinθ

What is the correct answer?

4

In a band and block brake, the ratio of tensions on tight side and slack side of the band is (where μ = Coefficient of friction between the blocks and the drum, θ = Semi-angle of each block subtending at the centre of drum, and n = Number of blocks)

A. T₁/T₂ = μ. θ. n

B. T₁/T₂ = [(1 - μ tanθ)/(1 + μ tanθ)]n

C. T₁/T₂ = (μ θ)n

D. T₁/T₂ = [(1 + μ tanθ)/(1 - μ tanθ)]n

What is the correct answer?

4

What is the number of instantaneous centres for an eight link mechanism?

A. 15

B. 28

C. 30

D. 8

What is the correct answer?

4

The radial distance from the top of a tooth to the bottom of a tooth in a meshing gear, is called

A. Dedendum

B. Addendum

C. Clearance

D. Working depth

What is the correct answer?

4

Cam size depends upon

A. Base circle

B. Pitch circle

C. Prime circle

D. Outer circle

What is the correct answer?

4

The purpose of a link is to

A. Transmit motion

B. Guide other links

C. Act as a support

D. All of the above

What is the correct answer?

4

Lower pairs are those which have

A. Point or line contact between the two elements when in motion

B. Surface contact between the two elements when in motion

C. Elements of pairs not held together mechanically

D. Two elements that permit relative motion

What is the correct answer?

4

The arrangement is called bevel gearing, when two __________ are connected by gears.

A. Intersecting and coplanar shafts

B. Nonintersecting and non-coplanar shafts

C. Parallel and coplanar shafts

D. Parallel and non-coplanar shafts

What is the correct answer?

4

For two governors A and B, the lift of sleeve of governor A is more than that of governor B, for a given fractional change in speed. It indicates that

A. Governor A is more sensitive than governor B

B. Governor B is more sensitive than governor A

C. Both governors A and B are equally sensitive

D. None of the above

What is the correct answer?

4

In locomotives, the ratio of the connecting rod length to me crank radius is kept very large in order to

A. Minimise the effect of primary forces

B. Minimise the effect of secondary forces

C. Have perfect balancing

D. To start the locomotive quickly

What is the correct answer?

4

The lower pair is a

A. Open pair

B. Closed pair

C. Sliding pair

D. Point contact pair

What is the correct answer?

4

An exact straight line motion mechanism is a

A. Scott-Russell's mechanism

B. Hart's mechanism

C. Peaucellier's mechanism

D. All of these

What is the correct answer?

4

The flank of the tooth is the surface of the tooth __________ the pitch surface.

A. Above

B. Below

C. At

D. None of these

What is the correct answer?

4

The centrifugal tension in belts

A. Increases power transmitted

B. Decreases power transmitted

C. Have no effect on power transmitted

D. Increases power transmitted upto a certain speed and then decreases

What is the correct answer?

4

In a differential band brake as shown in the below figure, if the length OB is greater than OA, then the force P at C should act in the downward direction.

A. Yes

B. No

C. Unpredictable

D. None of these

What is the correct answer?

4

The balancing weights are introduced in planes parallel to the plane of rotation of the disturbing mass. To obtain complete dynamic balance, the minimum number of balancing weights to be introduced in different planes is

A. 1

B. 2

C. 3

D. 4

What is the correct answer?

4

When the nature of contact between the elements of a pair is such that it can only slide relative to the other, the pair is known as a

A. Screw pair

B. Spherical pair

C. Turning pair

D. Sliding pair

What is the correct answer?

4

The equation of motion for a vibrating system with viscous damping is (d²x/dt²) + (c/m). (dx/dt) + (s/m). x = 0 If the roots of this equation are real, then the system will be

A. Over-damped

B. Under damped

C. Critically damped

D. Without vibrations

What is the correct answer?

4

Shaft revolving in a bearing is the following type of pair

A. Lower pair

B. Higher pair

C. Spherical pair

D. Cylindrical pair

What is the correct answer?

4

When the elements of a pair are kept in contact by the action of external forces, the pair is said to be a

A. Lower pair

B. Higher pair

C. Self-closed pair

D. Force-closed pair

What is the correct answer?

4

Which gear is used for connecting two coplanar and intersecting shafts?

A. Spur gear

B. Helical gear

C. Bevel gear

D. None of the above

What is the correct answer?

4

The two elements of a pair are said to form a _________ when they permit relative motion between them.

A. Open pair

B. Kinematic pair

C. Sliding pair

D. None of these

What is the correct answer?

4

Which is the false statement about the properties of instantaneous centre?

A. At the instantaneous center of rotation, one rigid link rotates instantaneously relative to another for the configuration of mechanism considered

B. The two rigid links have no linear velocities relative to each other at the instantaneous centre

C. The two rigid links which have no linear velocity relative to each other at this center have the same linear velocity to the third rigid link

D. The double centre can be denoted either by O2 or O12, but proper selection should be made

What is the correct answer?

4

The face of the tooth is the

A. Surface of the top of tooth

B. Surface of tooth above the pitch surface

C. Width of tooth below the pitch surface

D. Width of tooth measured along the pitch circle

What is the correct answer?

4

When the sleeve of a Porter governor moves downwards, the governor speed

A. Increases

B. Decreases

C. Remain unaffected

D. First increases and then decreases

What is the correct answer?

4

The brake commonly used in railway trains is

A. Shoe brake

B. Band brake

C. Band and block brake

D. Internal expanding brake

What is the correct answer?

4

Which of the following is an inversion of Single slider crank chain?

A. Beam engine

B. Rotary engine

C. Oldhams coupling

D. Elliptical trammel

What is the correct answer?

4

The Klein's diagram is useful to find

A. Displacement of various parts

B. Velocity of various parts

C. Acceleration of various parts

D. Angular acceleration of various parts

What is the correct answer?

4

The indicator using Watt mechanism is known as

A. Thompson indicator

B. Richard indicator

C. Simplex indicator

D. Thomson indicator

What is the correct answer?

4

Which of the following statement is correct?

A. The power absorbed in operating the piston valve is less than D-slide valve

B. The wear of the piston valve is less than the wear of the D-slide valve

C. The D-slide valve is also called outside admission valve.

D. All of the above