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Summary - MECHANICAL ENGINEERING
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Summary - MECHANICAL ENGINEERING
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*****Compute the humidity ratio of air considering the
density at 35 °C and 101 kPa is 1.05 kg/m3.
A. 0.036 kgvapor /kgair
B. 0.064 kgvapor /kgair
C. 0.36 kgvapor /kgair 1.08
D. 0.63 kgvapor /kgair
Correction!
,If atmospheric air 14.7 psia and 60 °F at sea level,
what is the pressure at 12000 ft altitude if air is
incompressible. Note: @ 60 °F: the density of air is
0.0763 lbm/ft3; P1 = 14.7 psia.
A. 5.467 psia compressible
B. 9.53 psia
C. 8.342 psia Formula:
D. 2.346 psia h1 - h 2
P2 = P1 e RT
Correction!
,A cylindrical 1 ft diameter, 4 ft high tank contains 3 ft
of water. What rotational speed is required to spin
water out of top?
A. 22.7 rad/s
B. 32.5 rad/s
C. 22.7 rad/s
D. 34.5 rad/s
Formula:
ω 2 r2
h=
g
, A two-pass surface condenser is to be designed using overall heat
transfer coefficient of 480 Btu/°F-ft2 of outside tube surface. The
tubes are to be 1 inch outside diameter with 1/16 in walls (or 7/8
in. inside diameter). Entering circulating water velocity is to be 6
ft/s. steam enters the condenser at a rate of 100,000 lb/hr at a
pressure of one psia and an enthalpy of 1090 Btu/lb. Condensate
leaves at saturated liquid at one psia. Circulating water enters the
condenser at 85 deg. F and leaves at 95 deg F. Note: 1 psia
condensate has temperature of 101.7 deg. F. Wet steam entering
becomes condensate at 101.7 deg. F with hf = 69.72 Btu/lb.
Calculate the number of tubes to be used in each pass.
A. 18, 200 tubes
B. 15, 400 tubes
C. 10, 450 tubes
D. 11, 456 tubes
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