Practice Test: Question Set - 08
1. A 'rupture disc' is provided in chemical equipments as an accessory meant for
- (A) Relieving excess pressure
- (B) Creating turbulence
- (C) Enhancing mixing rate
- (D) Avoiding vortex formation
2. The distance between the centers of a rivet hole to the nearest edge of the plate is called
- (A) Pitch
- (B) Margin
- (C) Back pitch
- (D) None of these
3. The minimum shell thickness for tank ≤ 15 meters diameter is limited to _________ mm, for reasons of elastic stability.
- (A) 2
- (B) 5
- (C) 10
- (D) 15
4. To avoid the tearing off the plate of an edge, the margin (i.e., the minimum distance from the center of the rivet hole to the nearest edge of the plate) should be equal to
- (A) 0.5 d
- (B) d
- (C) 1.5 d
- (D) 2.5 d
5. _________ shaped roof is the most commonly used roof for cylindrical storage tanks.
- (A) Conical
- (B) Flat
- (C) Dome
- (D) Umbrella
6. When one of the fluids is highly corrosive and has fouling tendency, it should
- (A) Preferably flow inside the tube for its easier
internal cleaning
- (B) Preferably flow outside the tube
- (C) Flow at a very slow velocity
- (D) Flow outside the tube, when the flow is counter-current and inside
the tube when the flow is co-current
7. Filtration rate is affected by the
- (A) Pressure drop across the cake & filter medium
- (B) Cake & filter medium resistance
- (C) Area of filtering surface & the viscosity of filtrate
- (D) All (a), (b) and (c)
8. In a bag filter, the pressure drop increases directly as the
- (A) Density of the gas, but is independent of the viscosity of the gas
- (B) Density of the gas and inversely as viscosity of the gas
- (C) Viscosity of the gas and inversely as density of the gas
- (D) None of these
9. Normally, the length to diameter ratio of rotary dryers varies from 4 to 10 and for its economic operation; the number of transfer units (NTU) for such dryers varies from
- (A) 1.5-2.5
- (B) 3.5-5.5
- (C) 7.5-10.0
- (D) 10-15
10. In a shell and tube heat exchanger for a given heat transfer surface area, smaller diameter tubes are favored as compared to larger diameter ones; because the smaller diameter tubes
- (A) Are easier to clean
- (B) Are less prone to fouling
- (C) Can be fitted into a smaller shell diameter hence the cost of the
heat exchanger would be less
- (D) None of these
11. Pick out the wrong statement
- (A) In a flanged and standard dished head, the crown
radius is ≤ shell outside diameter
- (B) In a flanged and shallow dished head, the crown
radius is > shell outside diameter
- (C) Flat head covers are most suitable for larger vessels operating at
very high pressure
- (D) Flanged only head is a type of flat head in
which gradual change in the shape at the center results in reduced local
stresses
12. In a vertical short tube evaporator (Calandria type), the
- (A) Tube dia of 2.5-7.5 cms, tube length of 75-200
cms and cylindrical drum dia of 1-6 metres are normally used
- (B) Area of central downtake is equal to 40 to 100% of total
cross-sectional area of the surrounding tube
- (C) Liquor is inside the tube while the steam is outside the tube
- (D) All (a), (b) & (c)
13. The ratio of volumes of the mixed reactor to the plug flow reactor (for identical feed composition, flow rate, conversion, and for all positive reaction orders) is always
- (A) 1
- (B) < 1
- (C) > 1
- (D) Equal to the order of reaction
14. For a given fluid, as the pipe diameter increases, the pumping cost
- (A) Decreases
- (B) Increases
- (C) Remain unaffected
- (D) May increase or decrease depending upon whether
the fluid is Newtonian or non-Newtonian
15. In a _________ riveted joint, the number of rivets decreases from the innermost row to the outermost row.
- (A) Chain
- (B) Diamond
- (C) Zig-zag
- (D) None of these
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