# Multiple choice question for engineering

## Set 1

1. A notch is a device used to measure the turbulence of the flowing liquid directly.

a) True

b) False

### View Answer

2. The weir is an attachable structure made up of thermoplastic.

a) True

b) False

### View Answer

3. The notch is bigger in size than wier.

a) True

b) False

### View Answer

4. The MoM (Material of Manufacture) of notch is,

a) Thermoplastic

b) Metals

c) Fibre

d) Wood

### View Answer

5. Which of the following is not a way of classifying notches or weirs?

a) Based on the shape of opening

b) Based on the effect of the sides on the nappe

c) Based on the shape of the crest

d) Based on the effect of the sides on the crest

### View Answer

6. The nature of discharge is also a way of classifying notches.

a) True

b) False

### View Answer

7. Which of the following is not a way of classifying based on the shape of opening?

a) Rectangular notch

b) Circular notch

c) Trapezoidal notch

d) Stepped notch

### View Answer

8. Trapezoidal weir has another popular name. What is it?

a) Cipolletti weir

b) Hagen Poiseuille’s weir

c) Reynold’s weir

d) Euler’s weir

### View Answer

9. What is not the way of classifying weir based on their shape of crest?

a) Sharp crested weir

b) Broad crested weir

c) Narrow crested weir

d) Trapezoidal crested weir

### View Answer

10. What is not the way of classifying weir based on the emerging nappe?

a) Weir with end contraction

b) Weir without end contraction

c) Weir contraction at the beginning

d) Weir with absence of end contraction

### View Answer

## Set 2

1. Which one of the following is the correct relation between compressibility β and Bulk Modulus k

a) β = k

b) β = 1/k

c) β = 2k

d) β = k/2

### View Answer

2. Which one of the following is true about Bulk Modulus of elasticity?

a) it is the ratio of compressive stress to volumetric strain

b) it is the ratio of compressive stress to linear strain

c) it is the ratio of tensile stress to volumetric strain

d) it is the ratio of tensile stress to linear strain

### View Answer

3. The value of the Bulk Modulus of elasticity for an incompressible fluid is

a) zero

b) unity

c) infinity

d) very low

### View Answer

4. Three fluids 1, 2 and 3 have Bulk Moduli of k1, k2 and k3 respectively. If k1 > k2 > k3, which liquid will have the highest compressibility?

a) liquid 1

b) liquid 2

c) liquid 3

d) they’ll have equal compressibilities

### View Answer

5. Bulk Modulus, Pressure, Force, Stress – Which one of these won’t have the same unit as the others?

a) Bulk Modulus

b) Pressure

c) Force

d) Stress

### View Answer

^{2}but the unit of Force is N.

6. Which of the following is the dimension of Bulk Modulus?

a) [M^{1}L^{-1}T^{-1}].

b) [M^{1}L^{-1}T^{-2}].

c) [M^{1}L^{1}T^{-2}].

d) [M^{1}L^{1}T^{-1}].

### View Answer

7. Which one of the following is the unit of compressibility?

a) m=N

b) m^{2}=N

c) m^{3}=N

d) it is unitless

### View Answer

^{2}and the unit of compressibility becomes m

^{2}/N.

8. Which of the following is the dimension of compressibility?

a) [M^{1}L^{1}T^{-2}].

b) [M^{1}L^{1}T^{-1}].

c) [M^{-1}L^{1}T^{-2}].

d) [M^{-1}L^{1}T^{2}].

### View Answer

and [β] = [1/k] = [M^{-1}L^{1}T^{2}].

## Set 3

1. If a liquid enters a pipe of diameter d with a velocity v, what will it’s velocity at the exit if the diameter reduces to 0.5d?

a) v

b) 0.5v

c) 2v

d) 4v

### View Answer

2. The continuity equation is based on the principle of

a) conservation of mass

b) conservation of momentum

c) conservation of energy

d) conservation of force

### View Answer

3. Two pipes of diameters d1 and d2 converge to form a pipe of diameter d. If the liquid flows with a velocity of v1 and v2 in the two pipes, what will be the flow velocity in the third pipe?

### View Answer

4. Two pipes of diameters d1 and d2 converge to form a pipe of diameter 2d. If the liquid flows with a velocity of v1 and v2 in the two pipes, what will be the flow velocity in the third pipe?

a) v1 + v2

b) v1 + v2/2

c) v1 + v2/4

d) 2(v1 + v2)

### View Answer

5. Two pipes, each of diameter d, converge to form a pipe of diameter D. What should be the relation between d and D such that the flow velocity in the third pipe becomes double of that in each of the two pipes?

a) D = d

b) D = 2d

c) D = 3d

d) D = 4d

### View Answer

_{1}v

_{1}+ A

_{2}v

_{2}= Av d

^{2}v + d

^{2}v = D

^{2}v D = d.

6. Two pipes, each of diameter d, converge to form a pipe of diameter D. What should be the

relation between d and D such that the

ow velocity in the third pipe becomes half of that in each

of the two pipes?

a) D = d/2

b) D = d/3

c) D = d/4

d) D = d/5

### View Answer

_{1}v

_{1}+ A

_{2}v

_{2}= Av d

^{2}v + d

^{2}v = D

^{v/2}d = D ⁄ 4.

7. In a two dimensional flow, the component of the velocity along the X-axis is u = ax^{2} + bxy + cy^{2}.

If v = 0 at y = 0, what will be the velocity component in the Y-direction?

a) v = 2axy + by^{2}

b) v = 2axy + b ⁄ 2 y^{2}

c) v = -2axy – b ⁄ 2 y^{2}

d) v = -axy – b ⁄ 2 y^{2}

### View Answer

8. In a two dimensional flow, the component of the velocity along the X-axis and the Y-axis are u = ax^{2} + bxy + cy^{2} and v = cxy. What should be the condition for the flow field to be continuous?

a) a + c = 0

b) b + c = 0

c) 2a + c = 0

d) 2b + c = 0

### View Answer

9. In a two dimensional flow, the component of the velocity along the X-axis and the Y-axis are u = axy and v = bx^{2} + cy^{2}. What should be the condition for the flow field to be continuous?

a) a + b = 0

b) a + c = 0

c) a + 2b = 0

d) a + 2c = 0

### View Answer

10. In a two dimensional flow, the component of the velocity along the X-axis and the Y-axis are u = ax^{2} + bxy and v = cxy +dy^{2}. What should be the condition for the flow field to be continuous?

a) (a + b)x + (c + d)y = 0

b) (a + c)x + (b + d)y = 0

c) (2a + b)x + (c + 2d)y = 0

d) (2a + c)x + (b + 2d)y = 0

### View Answer

11. In a two dimensional flow, the component of the velocity along the X-axis and the Y-axis are u = ax^{2} + bxy and v = bxy + ay^{2}. The condition for the flow field to be continuous is

a) independent of the constants (a; b) but dependent on the variables (x; y)

b) independent of the variables (x; y) but dependent on the constants (a; b)

c) independent of both the constants (a; b) and the variables (x; y)

d) dependent on both the constants (a; b) and the variables (x; y)

### View Answer

12. In a two dimensional flow, the component of the velocity along the X-axis and the Y-axis are u = ax + by and v = ax – by. For what condition will the flow field be continuous?

a) impossible

b) possible if a = b

c) possible if a = 2b

d) possible for all values of a and b

### View Answer

13. In a two dimensional flow, the component of the velocity along the X-axis and the Y-axis are u = ay^{2} + bxy and v = ax^{2} + bxy. The flow will be continuous if

a) a + b = 0

b) a – b = 0

c) x + y = 0

d) x – y = 0

### View Answer

14. In a two dimensional flow, the component of the velocity along the X-axis and the Y-axis are u = ax^{2} + bxy and v = bxy + ay^{2}. The condition for the flow field to be continuous is

a) independent of a and b

b) independent of a and c

c) independent of b and c

d) independent of a, b and c

### View Answer

15. In a water supply system, water flows in from pipes 1 and 2 and goes out from pipes 3 and 4 as shown. If all the pipes have the same diameter, which of the following must be correct?

a) the sum of the flow velocities in 1 and 2 is equal to that in 3 and 4

b) the sum of the flow velocities in 1 and 3 is equal to that in 2 and 4

c) the sum of the flow velocities in 1 and 4 is equal to that in 2 and 3

d) the flow velocities in 1 and 2 is equal to that in 3 and 4

### View Answer

_{1}v

_{1}+ A

_{2}v

_{2}= A

_{3}v

_{3}+ A

_{4}v

_{4}Since d

_{1}= d

_{2}= d

_{3}= d

_{4}, v

_{1}+ v

_{2}= v

_{3}+ v

_{4}.

## Set 4

1. The continuity equation is based on the premise of-

a) Law of conservation of energy

b) Law of conservation of mass

c) Law of conservation of momentum

d) None of the mentioned

### View Answer

2. The continuity equation is only applicable to incompressible fluid.

a) True

b) False

### View Answer

3. For incompressible fluid flow, if area reduces then what is the effect on the velocity.

a) increases

b) decreases

c) first increases then decreases

d) first decreases then increases

### View Answer

4. For compressible fluid flow in a pipe, having decrease in specific gravity what will be the effect of decrease in diameter?

a) It will cause increase in velocity

b) It will cause decrease in velocity

c) It remains constant

d) None of the mentioned

### View Answer

5. What is the most common assumption while dealing with fluid flow problems using continuity equation?

a) Flow is assumed to be compressible

b) Flow is assumed to be unsteady

c) Flow is assumed to be steady

d) Flow is assumed to be turbulent

### View Answer

6. The diameters of a pipe at the sections 1 and 2 are 8 cm and 13 cm respectively. Find the discharge through pipe if the velocity of water flowing through the pipe at section 1 is 6 m/s. Determine also the velocity at section 2.

a) 2.27 m/s

b) 4.54 m/s

c) 1.13 m/s

d) 3.25 m/s

### View Answer

^{2}* 6) / 13

^{2}=2.27 m/s.

7. The continuity equation can only be used for analysis of conserved quantity.

a) True

b) False

### View Answer

8. The diameter of a pipe at the section 1 is 9 cm. If the velocity of water flowing through the pipe at section 1 is 4.8 m/s and section 2 is 9 m/s, Determine the area at section 2.

a) 33.93 m^{2}

b) 67.86 m^{2}

c) 16.96 m^{2}

d) 38.66 m^{2}

### View Answer

^{2}.

9. For a flow to be physically possible it must primarily satisfy which equation?

a) Equation of conservation of energy

b) Equation of conservation of mass or continuity equation

c) Equation of conservation of momentum

d) None of the mentioned

### View Answer

10. Continuity equation can also be derived for polar coordinate system

a) True

b) False

### View Answer

## Set 5

1. When is orifice called ‘large orifice’?

a) If the head of liquid is less than 5 times the depth of orifice

b) If the head of liquid is less than 2.5 times the depth of orifice

c) If the head of liquid is less Hence, 4 times the depth of orifice

d) If the head of liquid is less than 1.5 times the depth of orifice

### View Answer

2. In case of any orifice, velocity always remains constant and hence discharge can be calculated.

a) True

b) False

### View Answer

3. Find the discharge through a rectangular orifice 2.2 m wide and 1.3 m deep fitted to a easier tank. The water level in a team is 2.5 m above the top edge of orifice.

a) 13.9 m^{3}/s

b) 11.5 m^{3}/s

c) 16.9 m^{3}/s

d) 8.7 m^{3}/s

### View Answer

^{1.5}– H1

^{1.5}) Here, H1 = 3.8 H2 = 2.5 b = 2.2 Hence, Q = 13.9 m3/s.

4. Find the discharge through a rectangular orifice 3.2 m wide and 1.7 m deep fitted to a easier tank. The water level in a team is 3.3 m above the top edge of orifice. Take Cd = 0.6

a) 29.4 m^{3}/s

b) 58.5 m^{3}/s

c) 67.9 m^{3}/s

d) 78.7 m^{3}/s

### View Answer

^{1.5}– H1

^{1.5}) Here, H1 = 5 H2 = 3.3 b = 3.2 Hence, Q = 29.4 m3/s.

5. Find the discharge through totally drowned orifice of width 2.3 m if the difference of water levels on both side of the orifice be 40 cm. The height of water from to and bottom of the orifice are 2.6 m and 2.75 m respectively.

a) .56 m^{3}/s

b) .64 m^{3}/s

c) .75 m^{3}/s

d) .55 m^{3}/s

### View Answer

^{3}/s.

6. Find the discharge through totally drowned orifice of width 3.3 m if the difference of water levels on both side of the orifice be 50 cm. The height of water from to and bottom of the orifice are 2.25 m and 2.67 m respectively.

a) 2.8 m^{3}/s

b) 2.7 m^{3}/s

c) 2.6 m^{3}/s

d) 2.5 m^{3}/s

### View Answer

^{3}/s.

7. A rectangular orifice of 2 m width and 1.2 m deep is fitted in one side of large tank. The easier level on one side of the orifice is 3m above the top edge of the orifice while on the other side of the orifice the water level is 0.5 m below it’s top edge. Calculate discharge if Cd = .64

a) 4.95 m^{3}/s

b) 5.67 m^{3}/s

c) 3.56 m^{3}/s

d) 6.75 m^{3}/s

### View Answer

H = 3.5
Q = 4.94 m^{3}/s.

8. The time taken to empty the tank is independent of Cd but depends only on the height and acceleration due to gravity.

a) True

b) False

### View Answer

9. The discharge rate is independent of the height difference and dependent only on the height.

a) True

b) False

### View Answer

10. In case of submerged orifice the discharge is substantially dependent on temperature of fluid

a) True

b) False