* c- a= V-U / T.

252. The aircraft has a take off velocity of 59m/s. It start from rest and accelerates Uniformly for 30 seconds before becoming airborne. What is the value of acceleration in m/s? and what taken off distance is needed? 2 * a-1.96 m/s and 885 m. 2 b-1.97 Cm/s and 685m. 2 c-2.97 m/s and 1180 m. 2 253. The angular distance measured in: a- Meters. b- Feet. * c- Radians. . 254. The angular velocity multiply by radius, is equal to: * a- Linear velocity. b- Angular acceleration. c- Distance. . 255. The propeller 3m in diameter rotates at 2400 rpm . Determine its an angular velocity in rad/sec: a-240.2. b-376.1 * c-251.2 256. The amount of matter contained within a body, is known as: a-Substance. * b-Mass. c-Molecule. 257. If a spherical mass moves and impacts on wall with a height 2 meter (without Loss of energy, M=2kgr, V=4m/s, g=10m/s ). Which item about sphere is true? a- Kinetic energy = 8J . b- Mechanical energy = 56 J. * c- Potential Energy = 50 J. 258. According to the gyroscopic principles we can say: a- More force → Less rate of precession.b- Less speed → Less Precession.* c- More moment → Less precession..

259. If surface has a friction we can say: a- Friction saves thermal energy. * b- Kinetic friction coefficient is less than static friction coefficient. c- Between two surfaces with friction molecules have rotational motion and not sliding motion. 260. In a Bernoulli’s equation if v1=v2=0:* a- P1/f1 = p2/f2 b- p2-p1 = fgh. c- p2-p1 = f2-f1. 261. About a non conservative work which item is true: * a- The work done by a gas is equal to the area under a p-v curve. b- The work done by a system depends only on the initial & final state. c- The work formula is: W=P/V. 262. Which of the following heat transferring method is in a vacuum? * a- Radiation. b- Convection. c- Conduction. 263. In a free expansion, if volume is double which item about entropy is correct: a-S2 –S1 = MRLn. b-Si > Sf. * c-Sf > Si. 264. We can say about entropy: a- Sf = Si (irreversible). * b- Sf > Si (irreversible). c- Sf = Si (isobaric). 265. The internal resistance of fluid is named: * a- Viscosity. b- Thermal expansion. c- Mechanical displacement. 266. What will happened, if temperature of fluid rises? a- Viscosity increase. * b- Viscosity decreases. c- Has no effect on viscosity. 267. What is the Viscosity Index? a- Resistance. b- Capacitance. * c- Change in viscosity with temperature.

268. What are the type of energy? (When a fluid flows): a- Pressure energy, Potential energy. b- Potential energy, Kinetic energy. * c- Pressure energy, Kinetic energy, and Potential energy. 269. The Bernoulli’s equation stated:a- The total energy level at any point on the fluid, when it moves from one point to another, is doubled b-The total energy level at any point on the fluid, when it moves from on point to another remains constant. c- The total energy level at any point on the fluid, when it moves from one point to another is in half. 270. The practical application of Bernoulli’s equation, which, originally usedas a Meter for measuring the quantity of flow (Q) of liquid in a pipeline, is.

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