The equivalent diameter for flow through a rectangular duct of width B and height H is

Rectangular ABCD is similar to rectangular EFGH. The length of each side of rectangle EFGH is 24 times the length of corresponding side of rectangle ABCD.The perameter of rectangular ABCD is 120 feet.What is the parameter of rectangular paramaeter EFGH?

A

288feet

B

345.6feet

C

576feet

D

691.2feet

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

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

The hydraulic radius for flow in a rectangular duct of cross-sectional dimension H, W is

A

$$\sqrt {\frac{{{\text{HW}}}}{\pi }} $$

B

$$\frac{{{\text{HW}}}}{{2{{\left( {{\text{H}} + {\text{W}}} \right)}^2}}}$$

C

$$\frac{{{\text{HW}}}}{{4{{\left( {{\text{H}} + {\text{W}}} \right)}^2}}}$$

D

$$\frac{{2{\text{HW}}}}{{\left( {{\text{H}} + {\text{W}}} \right)}}$$

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

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

Moment of inertia of a rectangular section having width (b) and depth (d) about an axis passing through its C.G. and parallel to the width (b), is

A

$$\frac{{{\text{d}}{{\text{b}}^3}}}{{12}}$$

B

$$\frac{{{\text{b}}{{\text{d}}^3}}}{{12}}$$

C

$$\frac{{{\text{d}}{{\text{b}}^3}}}{{36}}$$

D

$$\frac{{{\text{b}}{{\text{d}}^3}}}{{36}}$$

Inertia of a rectangular section of width and depth about an axis passing the moment of through C.G. and parallel to its width is

A

$$\frac{{{\text{B}}{{\text{D}}^2}}}{6}$$

B

$$\frac{{{\text{B}}{{\text{D}}^3}}}{6}$$

C

$$\frac{{{\text{B}}{{\text{D}}^3}}}{{12}}$$

D

$$\frac{{{{\text{B}}^2}{\text{D}}}}{6}$$

The area of a rectangular field is 52000 sq. meters. This rectangular area has been drawn on a map to the scale 1 cm to 100 m. The length is shown as 3.25 cm on the map. The breadth of the rectangular field in the map is -

A

1.6 m

B

160 m

C

160 cm

D

1.6 cm

The length, width, and depth of a rectangular box are 6 feet, 5 feet, and 7 feet, respectively, A pipe supplies water at a rate of 6 cubic feet per minute. How much time, in minutes, would it take for the pipe to fill a conical box whose volume is three times the volume of the rectangular box?

A

105

B

125

C

205

D

235

In D.C. machines the width of the duct is usually

A

4 mm

B

6 mm

C

8 mm

D

10 mm

The area of a rectangular R with width 4 feet is equal to the area of a square S which has a perimeter of 24 feet. The perimeter of the rectangular R, in feet, is :

A

9

B

16

C

24

D

26

The equivalent diameter for flow through a rectangular duct of width B and height H is

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