Engineering Mechanics Exam Test - Set 12

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 block of mass 20 kg lying on a rough horizontal plane is connected by a light string passing over a smooth pulley to another mass 5 kg, which can move freely in the Vertical direction, as shown in the below figure. The tension in the string will _ with the increase in coefficient of friction.

(A) Increase
(B) Decrease
(C) Not be effected
(D) None of these

Answer: (A) Increase

Q2. 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

Answer:(A) Compression or tension

Q3. The maximum efficiency of a screw jack is

(A) (1 – sinφ)/(1 + sinφ)
(B) (1 + sinφ)/(1 – sinφ)
(C) (1 – tanφ)/(1 + tanφ)
(D) (1 + tanφ)/(1 – tanφ)

Answer:(A) (1 – sinφ)/(1 + sinφ)

Q4. The motion of a wheel of a car is

(A) Purely translation
(B) Purely rotational
(C) Combined translation and rotational
(D) None of these

Answer: (C) Combined translation and rotational

Q5. Which of the following is not the unit of work, energy and heat?

(A) kcal
(B) kg-m
(C) kW-hr
(D) h.p

Answer: (D) h.p

Q6. If a number of forces are acting at a point, their resultant is given by

(A) (∑V)2 + (∑H)2
(B) √[(∑V)2 + (∑H)2]
(C) (∑V)2 +(∑H)2 +2(∑V)(∑H)
(D) √[(∑V)2 +(∑H)2 +2(∑V)(∑H)]

Answer: (B) √[(∑V)2 + (∑H)2]

Q7. Moment of inertia of a circular section about an axis perpendicular to the section is

(A) πd3/16
(B) πd3/32
(C) πd4/32
(D) πd4/64

Answer: (C) πd4/32

Q8. If a given force (or a given system of forces) acting on a body __ the position of the body, but keeps it in equilibrium, then its effect is to produce internal stress in the body.

(A) Change
(B) Does not change
(C) Changes periodically
(D) None of these

Answer: (B) Does not change

Q9. According to parallel axis theorem, the moment of inertia of a section about an axis parallel to the axis through center of gravity (i.e. IP) is given by(where, A = Area of the section, IG = Moment of inertia of the section about an axis passing through its C.G., and h = Distance between C.G. and the parallel axis.)

(A) IP = IG + Ah2
(B) IP = IG – Ah2
(C) IP = IG / Ah2
(D) IP = Ah2 / IG

Answer: (A) IP = IG + Ah2

Q10. The acceleration of a body sliding down an inclined surface is

(A) g sinθ
(B) g cosθ
(C) g tanθ
(D) None of these

Answer: (A) g sinθ

Q11. The moment of inertia of a solid sphere of mass ‘m’ and radius ‘r’ is

(A) 2mr2/3
(B) 2mr2/5
(C) mr2
(D) mr2/2

Answer: (B) 2mr2/5

Q12. Coplanar non-concurrent forces are those forces which __ at one point, but their lines of action lie on the same plane.

(A) Meet
(B) Do not meet
(C) Either ‘A’ or ‘B’
(D) None of these

Answer: (B) Do not meet

Q13. The acceleration of a particle moving with simple harmonic motion is __ at the mean position.

(A) Zero
(B) Minimum
(C) Maximum
(D) None of these

Answer: (A) Zero

Q14. The center 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

Answer: (D) 3r/2

Q15. A smooth cylinder lying on its convex surface remains in __ equilibrium.

(A) Stable
(B) Unstable
(C) Neutral
(D) None of these

Answer: (B) Unstable

Q16. If the masses of both the bodies, as shown in the below figure, are doubled, then the acceleration in the string will be

(A) Same
(B) Half
(C) Double
(D) None of these

Answer: (A) Same

Q17. The force applied on a body of mass 100 kg to produce an acceleration of 5 m/s2, is

(A) 20 N
(B) 100 N
(C) 500 N
(D) None of these

Answer: (C) 500 N

Q18. A redundant frame is also called __ frame.

(A) Perfect
(B) Imperfect
(C) Deficient
(D) None of these

Answer: (B) Imperfect

Q19. One end of a helical spring is fixed while the other end carries the load W which moves with simple harmonic motion. The frequency of motion is given by (where δ = Deflection of the spring.)

(A) 2π. √(g/δ)
(B) 1/2π. √(g/δ)
(C) 2π. √(δ/g)
(D) 1/2π. √(δ/g)

Answer: (B) 1/2π. √(g/δ)

Q20. 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

Answer: (C) P = mW + C

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Engineering Mechanics Exam Test – Set 12 :: Mechanical Engineering