To avoid the tearing off the plate of an edge, the margin (i.e., the minimum distance from the centre of the rivet hole to the nearest edge of the plate) should be equal to ____________________?

Related Mcqs:

1. The distance between the centres of a rivet hole to the nearest edge of the plate is called _________________?

   A. Pitch
   B. Margin
   C. Back pitch
   D. None of these

2. 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

3. Diameter of rivet hole (d, mm) and the plate thickness (t, mm) are related by Unwin’s formula as___________________?

   A. d = 1.1 t
   B. d = 1.6 √t
   C. d = 1.5 t
   D. d = 3 √t

4. For a 25 mm hole drilled in plates to be riveted, the shank diameter of the rivet should be _______________ mm?

   A. 25
   B. 23
   C. 26
   D. 27

5. A high vapour velocity is required for high plate efficiency in a sieve plate column. The satisfactory value of operating vapor velocity for design purpose in sieve plate column is about _______________ percent of the flooding velocity?

   A. 45
   B. 60
   C. 80
   D. 95

6. In a shell and tube heat exchanger, the shortest centre to centre distance between the adjacent tubes is__________________?

   A. Called tube pitch
   B. Called tube clearance
   C. Always less than the diameter of the tube
   D. None of these

7. The centre to centre distance between two consecutive baffles in a shell and tube heat exchanger is called the baffle pitch or baffle spacing, which is more than 1/5th the I.D. of the shell. Which of the following is not a function of the baffles ?

   A. To increase the residence time of shell side fluid
   B. To provide support to the tube bundle
   C. To reduce the induced vibration in the tubes
   D. To increase the tube side heat transfer co-efficient by inducing turbulence

8. 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

9. Height equivalent to a theoretical plate (HETP) is the height of packing that will give the same separation as one theoretical plate in gas-liquid mass transfer operations like distillation, absorption/stripping and humidification/dehumidification. HETP which is experimentally determined, depends upon the_______________?

   A. Flow rates of each fluid
   B. Type and size of packing
   C. Concentration of each fluid
   D. All A, B. & C.

10. The minimum plate spacing in most of the petroleum refinery distillation columns (of dia > 3 ft) is normally _____________ inches?

    A. 6
    B. 12
    C. 18
    D. 36