# Engineering Mechanics Preparation Quiz – Set 07 :: 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.

(A) W sinθ
(B) W cosθ
(C) W tanθ
(D) W cotθ

## Q2. A weight of 1000 N can be lifted by an effort of 80 N. If the velocity ratio is 20, the machine is

(A) Reversible
(B) Non-reversible
(C) Ideal
(D) None of these

## Q3. Coulomb friction is the friction between

(A) Bodies having relative motion
(B) Two dry surfaces
(C) Two lubricated surfaces
(D) Solids and liquids

Answer: (A) Bodies having relative motion

(A) bh3/4
(B) bh3/8
(C) bh3/12
(D) bh3/36

## Q5. The frequency of oscillation of a compound pendulum is (where kG = Radius of gyration about the centroidal axis, and h = Distance between the point of suspension and C.G. of the body.)

(A) 2π. √(gh/kG² + h²)
(B) 2π. √(kG² + h²/gh)
(C) 1/2π. √(gh/kG² + h²)
(D) 1/2π. √(kG² + h²/gh)

## Q6. The mechanical advantage of a lifting machine is the ratio of

(A) Distance moved by effort to the distance moved by load
(B) Load lifted to the effort applied
(C) Output to the input
(D) All of the above

## Q7. The resultant of the following three couples 20 kg force, 0.5 m arm, +ve sense 30 kg force, 1 m arm, -ve sense 40 kg force, 0.25 m arm, +ve sense having arm of 0.5 m will be

(A) 20 kg, -ve sense
(B) 20 kg, + ve sense
(C) 10 kg, + ve sense
(D) 10 kg, -ve sense

Answer: (A) 20 kg, -ve sense

## Q8. The algebraic sum of the resolved parts of a number of forces in a given direction is equal to the resolved part of their resultant in the same direction. This is known as

(A) Principle of independence of forces
(B) Principle of resolution of forces
(C) Principle of transmissibility of forces
(D) None of these

Answer: (B) Principle of resolution of forces

## Q9. A circular hole of 50 mm diameter is cut out from a circular disc of 100 mm diameter as shown in the below figure. The center of gravity of the section will lie

(B) In the hole
(C) At ‘O’
(D) None of these

(A) 1/m
(B) V.R./m
(C) m/V.R.
(D) 1/(m × V.R.)

## Q11. The loss of kinetic energy during inelastic impact, is given by (where m1 = Mass of the first body,m2 = Mass of the second body, and u1 and u2 = Velocities of the first and second bodies respectively.)

(A) [m₁ m₂/2(m₁ + m₂)] (u₁ – u₂)²
(B) [2(m₁ + m₂)/m₁ m₂] (u₁ – u₂)²
(C) [m₁ m₂/2(m₁ + m₂)] (u₁² – u₂²)
(D) [2(m₁ + m₂)/m₁ m₂] (u₁² – u₂²)

Answer: (A) [m₁ m₂/2(m₁ + m₂)] (u₁ – u₂)²

(A) 3r/ 8
(B) 4r/ 3π
(C) 8r/3
(D) 3r/4π

## Q13. Centre of gravity of a solid cone lies on the axis at the height

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

## Q14. The time of flight (t) of a projectile on an upward inclined plane is(where u = Velocity of projection, α = Angle of projection, and β = Inclination of the plane with the horizontal.)

(A) t = g cos β/2u sin (α – β)
(B) t = 2u sin (α – β)/g cos β
(C) t = g cos β/2u sin (α + β)
(D) t = 2u sin (α + β)/g cos β

Answer: (B) t = 2u sin (α – β)/g cos β

## Q15. Coefficient of friction is the

(A) Angle between normal reaction and the resultant of normal reaction and the limiting friction
(B) Ratio of limiting friction and normal reaction
(C) The friction force acting when the body is just about to move
(D) The friction force acting when the body is in motion

Answer: (B) Ratio of limiting friction and normal reaction

## Q16. The necessary condition for forces to be in equilibrium is that these should be

(A) Coplanar
(B) Meet at one point
(C) Both (A) and (B) above
(D) All be equal

Answer: (C) Both (A) and (B) above

(A) 0.5 cm
(B) 1.0 cm
(C) 1.5 cm
(D) 2.5 cm

## Q18. In a framed structure, as shown in the below figure, the force in the member BC isEngineering Mechanics question no. 13, set 06

(A) W/√3 (compression)
(B) W/√3 (tension)
(C) 2W/√3 (compression)
(D) 2W/√3 (tension)

(A) 6t² – 8t
(B) 3t² + 2t
(C) 6f – 8
(D) 6f – 4