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 pressure of 25 m of head of water is equal to
(A) 25 kN/ m²
(B) 245 kN/ m²
(C) 2500 kN/m²
(D) 2.5 kN/ m²
Answer: (B) 245 kN/ m²
Q2. When a body is immersed wholly or partially in a liquid, it is lifted up by a force equal to the weight of liquid displaced by the body. This statement is called
(A) Pascal’s law
(B) Archimedes’s principle
(C) Principle of flotation
(D) Bernoulli’s theorem
Answer: (B) Archimedes’s principle
Q3. The vapour pressure over the concave surface is
(A) Less man the vapour pressure over the plane surface
(B) Equal to the vapour pressure over the plane surface
(C) Greater than the vapour pressure over the plane surface
(D) Zero
Answer: (A) Less man the vapour pressure over the plane surface
Q4. Principle of similitude forms the basis of
(A) Comparing two identical equipments
(B) Designing models so that the result can be converted to prototypes
(C) Comparing similarity between design and actual equipment
(D) Hydraulic designs
Answer: (B) Designing models so that the result can be converted to prototypes
Q5. Which of the following statement is correct?
(A) In a compressible flow, the volume of the flowing liquid changes during the flow
(B) A flow, in which the volume of the flowing liquid does not change, is called incompressible flow
(C) When the particles rotate about their own axes while flowing, the flow is said to be rotational flow
(D) All of the above
Answer: (D) All of the above
Q6. The continuity equation is connected with
(A) Open channel/pipe flow
(B) Compressibility of fluids
(C) Conservation of mass
(D) Steady/unsteady flow
Answer: (C) Conservation of mass
Q7. The discharge in an open channel corresponding to critical depth is
(A) Zero
(B) Minimum
(C) Maximum
(D) None of these
Answer: (C) Maximum
Q8. The center of gravity of the volume of the liquid displaced by an immersed body is called
(A) Metacentre
(B) Center of pressure
(C) Center of buoyancy
(D) Center of gravity
Answer: (C) Center of buoyancy
Q9. The velocity through a channel of circular section will be maximum when the depth of water is __ the diameter of the circular channel.
(A) 0.34 times
(B) 0.67 times
(C) 0.81 times
(D) 0.95 times
Answer: (C) 0.81 times
Q10. When the Venturimeter is inclined, then for a given flow it will show __ reading.
(A) Same
(B) More
(C) Less
(D) None of these
Answer: (A) Same
Q11. Which of the following instruments is used to measure flow on the application of Bernoulli’s theorem?
(A) Venturimeter
(B) Orifice plate
(C) Nozzle
(D) All of the above
Answer: (D) All of the above
Q12. The Metacentric heights of two floating bodies A and B are 1 m and 1.5 m respectively. Select the correct statement.
(A) The bodies A and B have equal stability
(B) The body A is more stable than body B
(C) The body B is more stable than body A
(D) The bodies A and B are unstable
Answer: (C) The body B is more stable than body A
Q13. The units of kinematic viscosity are
(A) Metres² per sec
(B) kg sec/metre
(C) Newton-sec per metre
(D) Newton-sec per metre
Answer:(A) Metres² per sec
Q14. The velocity of the liquid flowing through the divergent portion of a Venturimeter
(A) Remains constant
(B) Increases
(C) Decreases
(D) Depends upon mass of liquid
Answer: (C) Decreases
Q15. A weir is said to be narrow-crested weir, if the width of the crest of the weir is __ half the height of water above the weir crest.
(A) Equal to
(B) Less than
(C) More than
(D) None of these
Answer: (B) Less than
Q16. The error in discharge (dQ/Q) to the error in measurement of head (dH/H) over a triangular notch is given by
(A) dQ/Q = 3/2 × (dH/H)
(B) dQ/Q = 2 × (dH/H)
(C) dQ/Q = 5/2 × (dH/H)
(D) dQ/Q = 3 × (dH/H)
Answer: (C) dQ/Q = 5/2 × (dH/H)
Q17. An object having 10 kg mass weighs 9.81 kg on a spring balance. The value of ‘g’ at this place is
(A) 10 m/sec²
(B) 9.81 m/sec²
(C) 9.75 m/sec²
(D) 9 m/sec
Answer: (A) 10 m/sec²
Q18. The hammer blow in pipes occurs when
(A) There is excessive leakage in the pipe
(B) The pipe bursts under high pressure of fluid
(C) The flow of fluid through the pipe is suddenly brought to rest by closing of the valve
(D) The flow of fluid through the pipe is gradually brought to rest by closing of the valve
Answer: (C) The flow of fluid through the pipe is suddenly brought to rest by closing of the valve
Q19. Non uniform flow occurs when
(A) The direction and magnitude of the velocity at all points are identical
(B) The velocity of successive fluid particles, at any point, is the same at successive periods of time
(C) Velocity, depth, pressure, etc. change from point to point in the fluid flow
(D) The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane
Answer: (C) Velocity, depth, pressure, etc. change from point to point in the fluid flow
Q20. The velocity at which the flow changes from laminar flow to turbulent flow is called
(A) Critical velocity
(B) Velocity of approach
(C) Sub-sonic velocity
(D) Super-sonic velocity
Answer: (A) Critical velocity
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