Tube pitch is the __________ of tube diameters and the clearances.

In a shell and tube heat exchanger having square pitch, the shell side equivalent diameter is given by (where, P = pitch, d = outside diameter of the tube)

A

$$\frac{{4\left( {{{\text{p}}^2} - \pi {{\text{d}}^2}/4} \right)}}{{\pi {\text{d}}}}$$

B

$$\frac{{{{\text{p}}^2} - \pi {{\text{d}}^2}/4}}{{\pi {\text{d}}}}$$

C

$$\frac{{4{{\text{p}}^2}}}{{\pi {\text{d}}}}$$

D

$$\frac{{\pi {\text{d}}}}{{4{{\text{p}}^2}}}$$

Triangular pitch tube layout as compared to square pitch in a shell and tube heat exchanger

A

Permits the use of less tubes in a given shell diameter

B

Facilitates comparatively easier external cleaning because of large clearance

C

Permits the use of more tubes in a given shell diameter

D

Both B and C

In most of the shell and tube heat exchangers, the tube pitch is generally __________ the tube diameter.

A

Less than

B

1.25-1.50 times

C

2.5 times

D

One-fourth of

Minimum tube pitch recommended for shell and tube heat exchangers is about __________ times the outside diameter of the tube.

A

1.25

B

1.75

C

2.5

D

3.5

Which of the following property sets pitch or tone (high or low) for the synthesized speech when reading an element; the pitch may be specified absolutely or relative to the normal pitch for the voice-family used to read the text?

A

voice-check

B

voice-format

C

voice-pitch

D

voice-volume

It is necessary to maintain the valve clearances as they

A

Reduce the resistance to sliding that occurs between the cam and the tappet

B

Allow for lengthening of the valves owing to the heat of combustion

C

Increase the speed at which the valves move up and down

D

Make the crankshaft turn smoothly

If the valve clearances are excessively large, the problem that can arise is

A

Overheating of the engine

B

Incomplete valve closure

C

Fouling of spark plug by gasoline

D

None of these

In a shell and tube heat exchanger, square pitch compared to triangular pitch

A

Gives a higher shell side pressure drop

B

Gives a lower shell side pressure drop

C

Can pack more surface area into a shell of given diameter

D

Both (A) and (B)

E

Both (A) and (C)

In a shell and tube heat exchanger, triangular pitch arrangement as compared to square pitch arrangement

A

Results in higher shell side pressure drop

B

Can accomodate less number of tubes for a given shell diameter

C

Facilitates easier shell side cleaning; hence is more suitable for handling high dirt factor shell side fluid

D

Creates relatively lower turbulence on the shell side resulting in lower shell side heat transfer co-efficient

Shell side heat transfer co-efficient in case of square pitch as compared to the triangular pitch under similar condition of fluid flow and tube size is

A

More

B

Same

C

Less

D

Twice

Tube pitch is the __________ of tube diameters and the clearances.

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