8:-12.5

C:-0.0035

D:-0.0125

Correct Answer:- Option-D

Question83:-The total heat loss by convection and radiation from an unlagged steam pipe of 50 mm outer diameter at 415 K
o225

ಗಗ )

0ط رہ

௨ 1.18* ராடு ட்‌ = convective film coefficient.

to air at 290 K. Given € = 0.90 “h_{
A:-133 " (W)/ "m length of pip
B:-344.7 (W) "m length of pi
€:-230 * (W)/ "m length of pip
D:-55 * (W) "m length of €"

Correct Answer:- Option-B

Question84:-A multiple effect evaporator as compared to a single effect evaporator of the same capacity has
A:-Lower heat transfer area
B:-Lower steam economy
C:-Higher steam economy
D:-Higher solute concentration in the product
Correct Answer:- Option-C

Question85:-The overall heat transfer coefficient for a shell and tube heat exchanger for clean surface is ப (6) - 400

டு The fouling factor after one year of operation is found to be “hd_{0} = 2000" *(W)/(m~(2)K) . The overall

heat transfer coefficient at this time ‏کا‎
‎A:-1200 (29
B:-894 'ഡ്ര)/(് (210
6:33 (09
D:-287 0009
Correct Answer:- Option-C

Question86:-In a shell and tube heat exchanger, baffles are provided on the shell side to **
A:-Prevent the stagnation of shell side fluid
B:-Improve heat transfer
C:-Provide support for tubes
D:-All of the above
Correct Answer:- Option-D

Question87:-Fanning friction factor is defined चेऽ

५
6

1:

8 )
B:- ‏ع20‎
‎" {५2

جا 4

لا

Tw

~ 2-
०.९५

Correct Answer:- Option-B
Question88:-A continuous gravity decanter is used for separation of two immiscible liquids A and B of differing
densities “rho_(A)" and “rho_{B)" . If i is the viscosity of continuous phase, the separation time is given by