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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