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. In a screw jack, the effort required to lift the load is given by (where W = Load lifted, α = Helix angle, and φ = Angle of friction.)

(A) P = W tan (α – φ)

(B) P = W tan (α + φ)

(C) P = W tan (φ – α)

(D) P = W cos (α + φ)

Answer: (B) P = W tan (α + φ)

## Q2. The moment of inertia of a sphere of mass ‘m’ and radius ‘r’, about an axis tangential to it, is

(A) 2mr2/3

(B) 2mr2/5

(C) 7mr2/3

(D) 7mr2/5

Answer: (D) 7mr2/5

## Q3. One kg force is equal to

(A) 7.8 N

(B) 8.9 N

(C) 9.8 N

(D) 12 N

Answer: (C) 9.8 N

## Q4. If a number of forces are acting at a point, their resultant will be inclined at an angle ‘θ’ with the horizontal, such that

(A) tanθ = ΣH/ΣV

(B) tanθ = ΣV/ΣH

(C) tanθ = ΣV × ΣH

(D) tanθ = √(ΣV + ΣH)

Answer: (B) tanθ = ΣV/ΣH

## Q5. A body of weight ‘W’ is required to move up on rough inclined plane whose angle of inclination with the horizontal is ‘α’. The effort applied parallel to the plane is given by (where μ = tanφ = Coefficient of friction between the plane and the body.)

(A) P = W tanα

(B) P = W tan (α + φ)

(C) P = W (sinα + μcosα)

(D) P = W (cosα + μsinα)

Answer: (C) P = W (sinα + μcosα)

## Q6. The moment of inertia of a square of side a about its diagonal is

(A) a2/8

(B) a3/12

(C) a4/12

(D) a4/16

Answer:(C) a4/12

## Q7. The bodies which rebound after impact are called

(A) Inelastic bodies

(B) Elastic bodies

(C) Neither elastic nor inelastic bodies

(D) None of these

Answer: (B) Elastic bodies

## Q8. If a number of coplanar forces acting at a point be in equilibrium, the sum of clockwise moments must be *__* the sum of anticlockwise moments, about any point.

*__*

(A) Equal to

(B) Less than

(C) Greater than

(D) None of these

Answer: (A) Equal to

## Q9. 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

Answer: (B) Second

## Q10. The potential energy of a vertically raised body is *__* the kinetic energy of a vertically falling body.

*__*

(A) Equal to

(B) Less than

(C) Greater than

(D) None of these

Answer: (A) Equal to

## Q11. Which of the following is not a scalar quantity?

(A) Mass

(B) Volume

(C) Density

(D) Acceleration

Answer: (D) Acceleration

## Q12. The moment of inertia of a thin disc of mass ‘m’ and radius ‘r’, about an axis through its center of gravity and perpendicular to the plane of the disc is

(A) mr2/2

(B) mr2/4

(C) mr2/6

(D) mr2/8

Answer: (A) mr2/2

## Q13. The center of gravity of a quadrant of a circle lies along its central radius (r) at a distance of

(A) 0.5 r

(B) 0.6 r

(C) 0.7 r

(D) 0.8 r

Answer: (B) 0.6 r

## Q14. The resultant of the two forces ‘P’ and ‘Q’ is ‘R’. If ‘Q’ is doubled, the new resultant is perpendicular to ‘P’. Then

(A) P = Q

(B) Q = R

(C) Q = 2R

(D) None of these

Answer: (B) Q = R

## Q15. The periodic time of a particle with simple harmonic motion is *_* proportional to the angular velocity.

*_*

(A) Directly

(B) Inversely

(C) Square root

(D) None of these

Answer:(B) Inversely

## Q16. A smooth cylinder lying on a *__* is in neutral equilibrium.

*__*

(A) Curved surface

(B) Convex surface

(C) Horizontal surface

(D) None of these

Answer:(C) Horizontal surface

## Q17. The maximum acceleration of a particle moving with simple harmonic motion is

(A) ω

(B) ωr

(C) ω2r

(D) ω/r

Answer: (C) ω2r

## Q18. The velocity of a particle (v) moving with simple harmonic motion, at any instant is given by (where, r = Amplitude of motion, and y = Displacement of the particle from mean position.)

(A) ω.√(y² – r²)

(B) ω.√(r² – y²)

(C) ω².√(y² – r²)

(D) ω².√(r² – y²)

Answer: (B) ω.√(r² – y²)

## Q19. Center of gravity of a thin hollow cone lies on the axis at a height of

(A) One-fourth of the total height above base

(B) One-third of the total height above base

(C) One-half of the total height above base

(D) Three-eighth of the total height above the base

Answer: (B) One-third of the total height above base

## Q20. Effect of a force on a body depends upon

(A) Magnitude

(B) Direction

(C) Position or line of action

(D) All of the above

Answer: (D) All of the above

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