Must answer ALL questions to receive thumbs up. Sublimation occurs when CA) a li

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Must answer ALL questions to receive thumbs up.

Sublimation occurs when CA) a liquid is converted directly to a gas O (E) a solid is converted directly to a liquid O(C) a solid is converted directly to a gas D a substance exhibits gas and liquid properties How is film temperature determined? O (A) It is equal to the surface temperature O (B) It is equal to the free-stream temperature. (C It is the average of the surface and the free-stream temperatures O D) It is the average temperature ofthe body In designing a cylindrical pressuce tank 1 in diameter, a factor of safety of 1.3 is used. The cylinder is made of steel (y -200 MPa), and will contain pressures up to 7 MPa What is the required wall thickness, t, based on circamfereutial stress (A) 22m (B) 4mm (C) 88 mm (D) 120mm Which of the following organizations in the United States maintains national reference standards? (A) ANSI e (B) IEEE (C) NIST (D) NSF which of the followin is known as the diametral pitch for a spur gear (A the angle between the teeth and the radial chord O B) the distance between the roots of teeth (C) the mean width of the teeth OD) the number of teeth per inch

Explanation / Answer

1) Sublimation occurs when

Ans. C) Solid is converted directly to the gas

2) How is the film temperature is determined

Ans. C) It is the average of the surface and the free stream temperature

3) Given Data :

Diameter: 1 m

FOS: 2.5

yield = 200 MPa

Pressure,P = 7 Mpa

According to circumferential stress consideration c = pd/2t

Ans. B) 44 mm

4) Which of the following organization in united states maintains national reference standard record

Ans. C) NIST

5) Which of the following is known as the diametral pitch of spur gear

Ans. D) The no. of teeth per inch

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