Home
Current Affairs January 2024

What is the correct answer?

4

The maximum efficiency of a lifting machine is

A. 1/m

B. V.R./m

C. m/V.R.

D. 1/(m × V.R.)

Correct Answer :

D. 1/(m × V.R.)


Related Questions

What is the correct answer?

4

The principle of transmissibility of forces states that, when a force acts upon a body, its effect is

A. Same at every point on its line of action

B. Different at different points on its line of action

C. Minimum, if it acts at the centre of gravity of the body

D. Maximum, if it acts at the centre of gravity of the body

What is the correct answer?

4

When a body falls freely under gravitational force, it possesses __________ weight.

A. No

B. Minimum

C. Maximum

D. None of these

What is the correct answer?

4

The unit of force in S.I. units is

A. kilogram

B. Newton

C. Watt

D. Dyne

What is the correct answer?

4

The law of the machine is (where P = Effort applied to lift the load, m = A constant which is equal to the slope of the line, W = Load lifted, and C = Another constant which represents the machine friction.)

A. P = mW - C

B. P = m/W + C

C. P = mW + C

D. P = C - mW

What is the correct answer?

4

When a body of mass m attains a velocity v from rest in time t, then the kinetic energy of translation is

A. mv2

B. mgv2

C. 0.5 mv2

D. 0.5 mgv2

What is the correct answer?

4

Which of the following statement is incorrect?

A. A force acting in the opposite direction to the motion of the body is called force of friction

B. The ratio of the limiting friction to the normal reaction is called coefficient of friction

C. A machine whose efficiency is 100% is known as an ideal machine

D. The velocity ratio of a machine is the ratio of load lifted to the effort applied

What is the correct answer?

4

The centre of gravity a T-section 100 mm × 150 mm × 50 mm from its bottom is

A. 50 mm

B. 75 mm

C. 87.5 mm

D. 125 mm

What is the correct answer?

4

If the number of pulleys in a system is equal to its velocity ratio, then it is a __________ system of pulleys

A. First

B. Second

C. Third

D. None of these

What is the correct answer?

4

The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction in which the force acts. This statement is known as

A. Newton's first law of motion

B. Newton's second law of motion

C. Newton's third law of motion

D. None of these

What is the correct answer?

4

Which is the correct statement about law of polygon of forces?

A. If any number of forces acting at a point can be represented by the sides of a polygon taken in order, then the forces are in equilibrium

B. If any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon, then the forces are in equilibrium

C. If a polygon representing forces acting at a point is closed then forces are in equilibrium

D. If any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium

What is the correct answer?

4

The total motion possessed by a body, is called

A. Impulsive force

B. Mass

C. Weight

D. Momentum

What is the correct answer?

4

Moment of inertia is the

A. Second moment of force

B. Second moment of area

C. Second moment of mass

D. All of these

What is the correct answer?

4

The force required to move the body up the plane will be minimum if it makes an angle with the inclined plane __________ the angle of friction.

A. Equal to

B. Less than

C. Greater than

D. None of these

What is the correct answer?

4

D' Alembert's principle is used for

A. Reducing the problem of kinetics to equivalent statics problem

B. Determining stresses in the truss

C. Stability of floating bodies

D. Designing safe structures

What is the correct answer?

4

The linear acceleration (a) of a body rotating along a circular path of radius (r) with an angular acceleration of α rad/s2, is

A. a = α/ r

B. a = α.r

C. a = r / α

D. None of these

What is the correct answer?

4

Static friction is always __________ dynamic friction.

A. Equal to

B. Less than

C. Greater than

D. None of these

What is the correct answer?

4

The process of finding out the resultant force is called __________ of forces.

A. Composition

B. Resolution

C. Decomposition

D. None of these

What is the correct answer?

4

A trolley wire weighs 1.2 kg per meter length. The ends of the wire are attached to two poles 20 meters apart. If the horizontal tension is 1500 kg find the dip in the middle of the span

A. 2.5 cm

B. 3.0 cm

C. 4.0 cm

D. 5.0 cm

What is the correct answer?

4

The maximum efficiency of a lifting machine is

A. 1/m

B. V.R./m

C. m/V.R.

D. 1/(m × V.R.)

What is the correct answer?

4

A framed structure is imperfect, if the numbers of members are __________ (2j - 3).

A. Equal to

B. Less than

C. Greater than

D. Either (B) or (C)

What is the correct answer?

4

Which of the following is a scalar quantity?

A. Force

B. Speed

C. Velocity

D. Acceleration

What is the correct answer?

4

The possible loading in various members of framed structures are

A. Compression or tension

B. Buckling or shear

C. Shear or tension

D. All of the above

What is the correct answer?

4

The range of projectile on a downward inclined plane is ________ the range on upward inclined plane for the same velocity of projection and angle of projection.

A. Less than

B. More than

C. Equal to

D. None of These

What is the correct answer?

4

A spherical body is symmetrical about its perpendicular axis. According to Routh's rule, the moment of inertia of a body about an axis passing through its centre of gravity is (where, M = Mass of the body, and S = Sum of the squares of the two semi-axes.)

A. MS/3

B. MS/4

C. MS/5

D. None of these

What is the correct answer?

4

If n = number of members and y = number of joints, then for a perfect frame, n = ?

A. 1/2

B. 2/3

C. 3/2

D. 2/4

What is the correct answer?

4

A force acting on a body may

A. Change its motion

B. Balance the other forces acting on it

C. Retard its motion

D. All of the above

What is the correct answer?

4

The moment of inertia of a thin disc of mass m and radius r, about an axis through its centre of gravity and perpendicular to the plane of the disc is

A. mr2/2

B. mr2/4

C. mr2/6

D. mr2/8

What is the correct answer?

4

Which one of the following statements is not correct?

A. The tangent of the angle of friction is equal to coefficient of friction

B. The angle of repose is equal to angle of friction

C. The tangent of the angle of repose is equal to coefficient of friction

D. The sine of the angle of repose is equal to coefficient to friction

What is the correct answer?

4

The acceleration of a body sliding down an inclined surface is

A. g sinθ

B. g cosθ

C. g tanθ

D. None of these

What is the correct answer?

4

The centre of percussion of a solid cylinder of radius r resting on a horizontal plane will be

A. r/2

B. 2r/3

C. r/A

D. 3r/2