Krit University Example 2.2: (a) If the T-beam shown is uncracked, calculate the stress in the concrete
at the top and bottom extreme fibers under a positive bending moment of 112 kN. m.
(b) If f. - 20.7 MPa and normal weight concrete is used, what is the maximum
uniformly distributed load the beam can carry if it is used as a simple beam with 7 m
span without exceeding the modulus of rupture of the concrete?
(c) Repeat part (b) if the beam is inverted,
br1500mm

= 270mm
he 125mm
centroid
675mm
530mm
wing

On a average work day more than work place firs are reorted

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?

The filament of an incandescent lamp has a temperature of 2000k. calculate the fraction of radiation emitted in the visible light band if the filament is approximated as blackbody