Hydraulics and Fluid Mechanics MCQ – Set 15

Are you guys looking for Mechanical Engineering MCQ Questions with Answers PDF Free Download as per Mechanical Engineeringnew 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. Which of the following is dimensionless?

(A) Specific weight
(B) Specific volume
(C) Specific speed
(D) Specific gravity

Answer: (D) Specific gravity

Q2. Poise is the unit of

(A) Surface tension
(B) Capillarity
(C) Viscosity
(D) Shear stress in fluids

Answer: (C) Viscosity

Q3. The discharge over the trapezoidal notch is equal to the discharge over the rectangular notch __ the discharge over the triangular notch.

(A) Plus
(B) Minus
(C) Divide
(D) None of these

Answer: (A) Plus

Q4. The water pressure per metre length on a vertical masonry wall of dam is (where w = Specific weight of the liquid, and H = Height of the liquid)

(A) wH/2
(B) wH
(C) wH2/2
(D) wH2/4

Answer: (C) wH2/2

Q5. The flow in which conditions do not change with time at any point, is known as

(A) One dimensional flow
(B) Uniform flow
(C) Steady flow
(D) Turbulent flow

Answer: (C) Steady flow

Q6. If 850 kg liquid occupies volume of one cubic meter, men 0.85 represents its

(A) Specific weight
(B) Specific mass
(C) Specific gravity
(D) Specific density

Answer: (C) Specific gravity

Q7. A vessel of 4 m3 contains oil which weighs 30 kN. The specific weight of the oil is

(A) 4.5 kN/m3
(B) 6 kN/m3
(C) 7.5 kN/m3
(D) 10 kN/m3

Answer: (C) 7.5 kN/m3

Q8. A fluid having no viscosity is known as

(A) Real fluid
(B) Ideal fluid
(C) Newtonian fluid
(D) Non-Newtonian fluid

Answer: (B) Ideal fluid

Q9. If the coefficient of discharge is 0.6, then the discharge over a right angled notch is

(A) 0.417 H5/2
(B) 1.417 H5/2
(C) 4.171 H5/2
(D) 7.141 H5/2

Answer: (B) 1.417 H5/2

Q10. The units of dynamic or absolute viscosity are

(A) Metres² per sec
(B) kg sec/meter
(C) Newton-sec per meter
(D) Newton-sec² per meter

Answer:(C) Newton-sec per meter

Q11. The critical depth for a channel is given by (where q = Unit discharge (discharge per unit width) through the channel)

(A) (q/g)1/2
(B) (q²/g)1/3
(C) (q³/g)1/4
(D) (q⁴/g)1/5

Answer:(B) (q²/g)1/3

Q12. Density of water is maximum at

(A) 0° C
(B) 0° K
(C) 4° C
(D) 100° C

Answer: (C) 4° C

Q13. The liquid used in manometers should have

(A) Low density
(B) High density
(C) Low surface tension
(D) High surface tension

Answer: (D) High surface tension

Q14. Falling drops of water become spheres due to the property of

(A) Adhesion
(B) Cohesion
(C) Surface tension
(D) Viscosity

Answer: (C) Surface tension

Q15. According to Bazin’s formula, the discharge over a rectangular weir is mL2g x H3/2where m is equal to

(A) 0.405 + (0.003/H)
(B) 0.003 + (0.405/H)
(C) 0.405 + (H/0.003)
(D) 0.003 + (H/0.405)

Answer: (A) 0.405 + (0.003/H)

Q16. When an internal mouthpiece is running free, the discharge through the mouthpiece is (where a = Area of mouthpiece, and H = Height of liquid above the mouthpiece)

(A) 0.5 a. √2gH
(B) 0.707 a. √2gH
(C) 0.855 a. √2gH
(D) a. √2gH

Answer: (A) 0.5 a. √2gH

Q17. The pressure of liquid at throat in a Venturimeter is __ than that at inlet.

(A) Higher
(B) Lower
(C) Same
(D) None of these

Answer: (B) Lower

Q18. Coefficient of resistance is the ratio of

(A) Actual velocity of jet at vena-contracta to the theoretical velocity
(B) Area of jet at vena-contracta to the area of orifice
(C) Loss of head in the orifice to the head of water available at the exit of the orifice
(D) Actual discharge through an orifice to the theoretical discharge

Answer: (C) Loss of head in the orifice to the head of water available at the exit of the orifice

Q19. Viscous force is the __ of shear stress due to viscosity and cross-section area of flow.

(A) Sum
(B) Different
(C) Product
(D) Ratio

Answer: (C) Product

Q20. Ratio of inertia force to surface Jension is known as

(A) Mach number
(B) Froude number
(C) Reynolds’s number
(D) Weber’s number

Answer: (D) Weber’s number

We hope the given Mechanical Engineering MCQ Questions with Answers will definitely yield fruitful results. Hope you got enough ideas on the MCQs on Mechanical Engineering. If you have any queries related to Mechanical Engineering MCQs Multiple Choice Questions with Answers, drop your questions below and will get back to you in no time.