Process Equipment and Plant Design Principles and Practices - Set 03 - ObjectiveBooks

Process Equipment and Plant Design Principles and Practices - Set 03

Practice Test: Question Set - 03

1. The longitudinal stress induced in a thin walled cylindrical vessel under internal pressure is
    (A) pd/2t
    (B) pd/4t
    (C) pd/t
    (D) pd/8t

2. Tube height in a calandria type evaporator is normally less than _________ meters.
    (A) 1
    (B) 2
    (C) 3.5
    (D) 5.5

3. 1.2 to 3.8 cms is the value of the
    (A) Downcomer liquid seal in case of a balanced tray design
    (B) Static submergence in case of a bubble cap tray for column operating under pressure (≥ 1 atm)
    (C) Skirt clearance for bubble caps
    (D) All (a), (b) and (c)

4. The ratio, (propeller agitator dia/tank dia) is normally taken as
    (A) 0.15-030
    (B) 0.5-0.65
    (C) 0.75-0.85
    (D) 0.60-0.90

5. In a pressure vessel containing multiple openings of various dimensions at different parts, stress concentration at the edges of the opening is maximum which becomes negligibly small beyond the area covered by _________ times the hole diameter.
    (A) Two
    (B) Five
    (C) Ten
    (D) Twenty

6. Normal screwed fittings are used for pipes upto a diameter of _________ inches.
    (A) 1.5
    (B) 3
    (C) 5
    (D) 9

7. Removable connection of tubes to tube sheet is called
    (A) Ferrule
    (B) Socket
    (C) Nipple
    (D) Saddle

8. The ratio of lateral strain to linear strain is termed as the
    (A) Poisson's ratio
    (B) Bulk modulus
    (C) Modulus of elasticity
    (D) Shear modulus

9. Bubble cap tray is the most commonly used tray in large distillation column, because
    (A) Of its flexibility and nearly constant efficiency under varying conditions of operation
    (B) It incurs less pressure drop as compared to any other try designed for the same duty
    (C) It eliminates the foaming and entrainment tendency during operation
    (D) None of these

10. What is the slope of the operating line in the rectifying section of a distillation column?
    (A) 0
    (B) ∞
    (C) > 1
    (D) < 1

11. (Le/D) for a Tee (used as elbow, entering run) would be around
    (A) 6
    (B) 60
    (C) 160
    (D) 200

12. Angled baffles are preferred in the agitation tank to control the swirling action; if the viscosity of the liquid to be mixed is about 200 poise. However, the baffle may be completely eliminated for mixing liquids having viscosity above _________ poise.
    (A) 300
    (B) 600
    (C) 1000
    (D) 1500

13. At equal mass velocities, the values of film co-efficient for gases as compared to that for liquids are generally.
    (A) Higher
    (B) Lower
    (C) Same
    (D) Unpredictable

14. Which of the following efficiencies can be greater than 100%?
    (A) Overall plate efficiency
    (B) Murphree plate efficiency
    (C) Point efficiency
    (D) None of these

15. The design stress, which is more than the damaging stress, is the least unit stress that will render a member unfit for service before the end of its normal life. The design stress factor or factor of safety indicates the margin between design stress and the _________ stress.
    (A) Working
    (B) Damaging
    (C) Allowable
    (D) None of these

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