Width and depth of grooves in the tube sheet holes normally are _______________ inch respectively?

Related Mcqs:

1. Tubes are fixed to the tube sheet (a thick circular metallic plate) by the method of tube rolling and brazing (non-removable) or ferrule connection (removable). Thickness of the tube, sheet is normally ____________ the outside diameter of the tube but in no case it should be less than 22 mm (7/8″)?

   A. Half
   B. Three fourth
   C. Equal to
   D. 1.5 times

2. 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

3. 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

4. In a shell and tube heat exchanger, the overall heat transfer co-efficient is proportional to the tube side (volumetric flow rate)0.8. This is valid, only when the ratio of the tube side film resistance to the total resistance is almost equal to____________________?

   A. ∞
   B. 1
   C. 20.8
   D. 2

5. In sieve plate column, holes are drilled or punched in sizes ranging from 2.5 to 12 mm (5 mm being widely used). The hole pitch is normally ______________ times the hole diameter to give the required hole area?

   A. 0.5 to 1.5
   B. 2.5 to 4.0
   C. 5 to 10
   D. 10 to 15

6. A perforated plate has holes of diameter dn arranged in a pitch ph. Each hole has a tube of I.D. dt passing through it. The ligament efficiency is given by_______________?

   A. (ph – dh)/ph
   B. (ph – dh . dt/2)/ph
   C. (ph – dt)/ph
   D. (ph – dh)/dh

7. Tube height in a calandria type evaporator is normally less than _______________ metres?

   A. 1
   B. 2
   C. 3.5
   D. 5.5

8. In a shell and tube heat exchanger, tube side _______________ of the mass velocity?

   A. Heat transfer co-efficient is proportional to 0.8th power
   B. Pressure drop is proportional to the square
   C. Both A. & B.
   D. Neither A. nor B.

9. Removable connection of tubes to tube sheet is called___________________?

   A. Ferrule
   B. Socket
   C. Nipple
   D. Saddle

10. The thickness of heat transfer plates used in the plate type heat exchanger ranges from _____________ mm, pressed in a single piece provided with grooves & corrugations?

    A. 0.3 to 0.8
    B. 1.25 to 3.125
    C. 3.5 to 7.0
    D. 8 to12