# Engineering Mechanics Objective Test – Set 13 :: Mechanical Engineering

Are you guys looking for Mechanical Engineering MCQ Questions with Answers PDF Free Download as per Mechanical Engineering new exam pattern? You came to the right page. This may assist you to understand and check your knowledge about the Subjects. Students also can take a free test of the Multiple Choice Questions of Mechanical Engineering. Each question has four options followed by the right answer. These Mechanical Engineering MCQ Questions are selected supported by the newest exam pattern.

## Q1. A force while acting on a body may

(A) Change its motion
(B) Balance the forces, already acting on it
(C) Give rise to the internal stresses in it
(D) All of these

Answer:(D) All of these

## Q2. Moment of inertia of a rectangular section having width (b) and depth (d) about an axis passing through its C.G. and parallel to the depth (d), is

(A) db³/12
(B) bd³/12
(C) db³/36
(D) bd³/36

Answer: (A) db³/12

## Q3. Which of the following do not have identical dimensions?

(A) Momentum and impulse
(B) Torque and energy
(C) Torque and work
(D) Moment of a force and angular momentum

Answer: (D) Moment of a force and angular momentum

## Q4. Efficiency of a screw jack is given by (where α = Helix angle, and φ = Angle of friction.)

(A) tan(α + φ)/tanα
(B) tanα/tan (α + φ)
(C) tan(α – φ)/tanα
(D) None of these

Answer: (B) tanα/tan (α + φ)

## Q5. The velocity ratio of a differential pulley block with D and d as the diameters of larger and smaller pulley, is

(A) D/(D – d)
(B) D/(D + d)
(C) 2D/(D – d)
(D) 2D/(D + d)

Answer:(C) 2D/(D – d)

(A) sinθ
(B) cosθ
(C) tanθ
(D) cosecθ

Answer: (A) sinθ

## Q7. If a body is acted upon by a number of coplanar non-concurrent forces, it may

(A) Rotate about itself without moving
(B) Move in any one direction rotating about itself
(C) Be completely at rest
(D) All of these

Answer: (D) All of these

## Q8. Which of the following is not the unit of pressure?

(A) kg/cm
(B) Bar
(C) Atmosphere
(D) Newton

Answer: (D) Newton

## Q9. Tension in the cable supporting a lift is more when the lift is moving __ with an acceleration.

(A) Upwards
(B) Downwards
(C) Horizontal
(D) None of these

Answer: (A) Upwards

## Q10. If tension in the cable supporting a lift moving downwards is half the tension when it is moving upwards, the acceleration of the lift is

(A) g/2
(B) g/3
(C) g/4
(D) None of these

Answer: (D) None of these

## Q11. The wheels of a moving car possess

(A) Potential energy only
(B) Kinetic energy of translation only
(C) Kinetic energy of rotation only
(D) Kinetic energy of translation and rotation both

Answer: (D) Kinetic energy of translation and rotation both

## Q12. A machine having an efficiency less than 50%, is known as

(A) Reversible machine
(B) Non-reversible machine
(C) Neither reversible nor non-reversible machine
(D) Ideal machine

Answer: (B) Non-reversible machine

(A) Horsepower
(B) Joule
(C) Watt
(D) kg-m

Answer: (C) Watt

## Q14. In order to determine the effects of a force, acting on a body, we must know

(A) Magnitude of the force
(B) Line of action of the force
(C) Nature of the force i.e. whether the force is push or pull
(D) All of the above

Answer: (D) All of the above

## Q15. The force induced in the string AB due to the load W, as shown in the below figure is

(A) W sinθ
(B) W cosθ
(C) W secθ
(D) W cosecθ

Answer: (D) W cosecθ

## Q16. In a screw jack, the effort required to lower the load is __ the effort required to raise the same load.

(A) Less than
(B) Equal to
(C) More than
(D) None of these

Answer: (A) Less than

## Q17. Forces are called concurrent when their lines of action meet in

(A) One point
(B) Two points
(C) Plane
(D) Perpendicular planes

Answer: (A) One point

## Q18. The moment of inertia of a square of side (a) about an axis through its center of gravity is

(A) a4/4
(B) a4/8
(C) a4/12
(D) a4/36

Answer: (C) a4/12

## Q19. The maximum frictional force, which comes into play, when a body just begins to slide over the surface of the other body, is known as

(A) Static friction
(B) Dynamic friction
(C) Limiting friction
(D) Coefficient of friction

Answer: (C) Limiting friction

## Q20. The unit of work in S.I. units is

(A) Newton
(B) erg
(C) kg-m
(D) joule

Answer: (D) joule

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