The equivalent diameter for pressure drop calculation for a duct of square cross-section is given by (where, x = each side of the square duct)

The equivalent diameter for pressure drop calculation for a duct of square cross-section is given by(where, x = each side of the square duct)

A

x

B

πx

C

2x

D

x/2

For annular flow of a fluid, the ratio of the equivalent diameter for pressure drop calculation to the equivalent diameter for heat transfer calculation is

A

$$\frac{{{{\text{d}}_1}}}{{{{\text{d}}_1} + {{\text{d}}_2}}}$$

B

$$\frac{{{{\text{d}}_2}}}{{{{\text{d}}_1} + {{\text{d}}_2}}}$$

C

$$\frac{{{{\text{d}}_1} + {{\text{d}}_2}}}{{{{\text{d}}_1}}}$$

D

$$\frac{{{{\text{d}}_1} + {{\text{d}}_2}}}{{{{\text{d}}_2}}}$$

Given below are three quantities named 1, 2 and 3. Based on the given information, you have to determine the relationship between the three quantities. You should use the given data and knowledge of Mathematics to choose between the possible answer. Quantity 1: Area of the innermost square. A square is made by joining the midpoints of a square of area 200 sq. m. The outermost square is called Square 1, The square inside it is called Square 2. The next square is made by joining midpoints of square 2 and is called Square 3. This process goes on. Square 5 is the innermost square. Quantity 2: A man starts with a speed of 10 km/hr. He increases his speed by 10 km/hr every hour at the start and drives at the same speed for that hour. If he traveled a total distance of 550 km. Find the time Quantity 3: Height of cylinder Its volume is equal to the volume of a cone whose radius is 14 cm and height is 39.3 cm. The radius of the cylinder is 14 cm

A

Quantity 2 > Quantity 3 > Quantity 1

B

Quantity 1 > Quantity 2 > Quantity 3

C

Quantity 3 > Quantity 1 > Quantity 2

D

Quantity 1 = Quantity 2 < Quantity 3

E

Quantity 1 > Quantity 2 = Quantity 3

Equivalent diameter for heat transfer calculation for a duct of square cross-section having each side as 'd' will be

A

d

B

$$\sqrt {\text{d}} $$

C

$$\sqrt {2\pi {\text{d}}} $$

D

$$\sqrt {2{\text{d}}} $$

The equivalent diameter for fluid flow through square cross section channel of side 'x', for pressure drop calculation purpose is given by

A

4x

B

2x

C

x

D

$$\sqrt {\text{x}} $$

The length of each side of square A is increased by 100 percent to make square B. Again the length of each side of square B is increased by 50 percent to make square C. By what percent is the area of square C greater than the sum of the areas of square A and B?

A

75%

B

80%

C

85%

D

90%

Air at atmospheric pressure and 20 degree Celsius flows with 6 m/s velocity through main trunck duct of air conditioning system. The duct is rectangular in cross-section and measures 40 cm by 80 cm. Determine heat loss per meter length of duct corresponding to unit temperature difference. The relevant thermos-physical properties of air are v = 15 * 10 -6 m 2/s α = 7.7 * 10 -2 m2/hr k = 0.026 W/m degree

A

32.768 W

B

42.768 W

C

52.768 W

D

62.768 W

A water filled manometer connected on one side to a duct through which pressurized air is flowing and is open to the atmosphere on the other side. If the height H is found to be 18 cm, determine the air pressure in duct.

A

P₁ = 104162 N/m²

B

P1 = 1765.8 N/m2

C

P1 = 103162 N/m2

D

P1 = 3162 N/m2

A = Area of the largest circle drawn inside a square of side 1 cm. B = Sum of areas of 4 identical (largest possible) circles drawn inside a square of side 1 cm. C = Sum of areas of 9 identical circle (largest possible) drawn inside a square of side 1 cm. D = Sum of area of 16 identical circles (largest possible) drawn inside a square of side 1 cm. Which of the following is TRUE about A, B, C and D?

A

A > B > C > D

B

A < B < C < D

C

A > B = C > D

D

No option is correct

The equivalent diameter for pressure drop calculation for a fluid flowing through a rectangular cross-section channels having sides 'x' & 'y' is given by

A

2xy/(x+y)

B

xy/(x+y)

C

(x+y)/2xy

D

(x+y)/xy

The equivalent diameter for pressure drop calculation for a duct of square cross-section is given by (where, x = each side of the square duct)

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