Practice Test: Question Set - 01
1. In a multipass shell and tube heat exchanger, the problem of differential expansion between the shell and tube passes is taken care of by using a
- (A) U-bend
- (B) Floating
head tube sheet
- (C) Either (a)
or (b)
- (D) Neither (a)
nor (b)
2. Vertical storage vessels are never supported by __________ support.
- (A) Bracket
- (B) Saddle
- (C) Skirt
- (D) Lug
3. The LMTD correction factor (FT) is applied in __________ heat exchangers.
- (A) 1-1
concurrent
- (B) Double pipe
- (C) All
multipass
- (D) All
(involving liquid/liquid heat transfer)
4. The minimum baffle height should be
- (A) Equal
to the impeller diameter
- (B) Twice
the impeller diameter
- (C) Twice
the tank diameter
- (D) 3/4
of the tank height
5. What is the value of 'q' for saturated vapor feed to a distillation column? (where q = fraction of the feed stream that is liquid.)
- (A) 0
- (B) 1
- (C) <
0
- (D) > 1
6. In actual operation of distillation column, the vapor is not distributed uniformly among the bubble caps, primarily because of the
- (A) Liquid
gradient on the tray
- (B) Lower
skirt clearance
- (C) Lower
static submergence
- (D) Small
downcomer liquid seal
7. Large process vessels operating under extreme temperature and pressure conditions are normally clad/ lined with materials like stainless steel, aluminium, nickel & its alloys, copper & its alloys and titanium. The cladding thickness is generally about __________ percent of the total thickness.
- (A) 1 to 5
- (B) 10 to 20
- (C) 30 to 40
- (D) 40 to 50
8. Pick out the wrong statement pertaining to shell and tube heat exchanger.
- (A) Clearance
between shell & baffles and between tube & baffles should be minimum to
avoid by-passing of the fluid, but it should be enough to permit the removal of
tube bundle
- (B) Baffles
are supported independently of the tubes by tie rods and positioned by spacers
- (C) Tie
rods are fixed at one end in the tube sheet by making blind holes and the
minimum number of tie rods is 4 with at least 10 mm diameter
- (D) Bracket
supports are used for horizontal shell, while saddle support is used for
vertical shell
9. Pick out the wrong statement pertaining to the design of a horizontal tube evaporator.
- (A) It is unsuitable
for concentrating those liquids, which form a scale or deposit salt
- (B) It is
suitable for process, in which the final product is a liquor instead of solid
- (C) Its usual
dimensions are: tube dia = 2-3 cms; evaporator body dia = 1-4 meters and evaporator
height = 2.5-4 meters
- (D) Liquor flows
inside the tube, while the steam is outside submerging the tube
10. In case of plain carbon steel, butt welded joints are used for shell plate thickness ≤ __________ cms.
- (A) 1.2
- (B) 0.5
- (C) 3.8
- (D) 6.8
11. Practical dividing line between a ductile and brittle materials is suggested, when the ultimate elongation is about 5%. Generally, larger the knuckle radius, stronger is the corner torus section of a head. The knuckle radius provided should be less than __________ of the head.
- (A) 6% of I.D.
- (B) 3
times the thickness
- (C) Either (a)
or (b), whichever is larger
- (D) Either (a)
or (b), whichever is smaller
12. In a distillation column, bubble caps are located on trays with a pitch of __________ times the outside diameter of the caps.
- (A) 1.3 to 2
- (B) 1.6 to 2
- (C) 2.5
- (D) 1.5 to 3
13. The LMTD correction factor (FT) is defined as the
- (A) Ratio of
true temperature difference to the LMTD
- (B) Ratio
of LMTD to the true temperature difference
- (C) Differenced
of true temperature difference and the LMTD
- (D) Geometric
mean of the true temperature difference and the LMTD
14. __________ closure is the weakest enclosure for cylindrical vessels.
- (A) Hemispherical
- (B) Torispherical
- (C) Conical or
flat plate
- (D) Elliptical
15. Which of the following is the best tube material from thermal conductivity point of view alone?
- (A) Aluminium
- (B) Stainless
steel
- (C) Copper
- (D) Carbon steel