Mechanical Engineering Answers

a four-cylinder petrol engine has a swept volume of 2000 cm³ and a clearance volume in each cylinder is 60 cm³.Calculate the air standard cycle efficiency

QI: NGO ii - CLO 2 - PI-24 In an epicyclic gear train, an arm carries two gears 1 and 2 having 40 and 50 teeth respectively. The arm rotates at 160 rpm cew about the center of gear 1, which is fixed. 1) Predict the speed of the gear 2. 2) Analyze the performance of this mechanism if the arm speed reduced to 110 rpm.

 A cone of base diameter 40 mm and height 50 mm is resting centrally on the top of square frustum whose smaller base is 40 mm, larger base is 50 mm and height 60 mm. The square base frustum is resting on its smaller base. Draw an isometric view of the solids.

A high pressure boiler delivers steam at a pressure of 90 bar and temperature of 480C.the steam is expanded in two section of steam turbine, first to 12 bar and second then withdraw and passed on to a reheater, where it is reheated to the initial temperature. The expansion process takes place again in the remaining section of the steam turbine, down the condenser pressure of 0.007 bar determine the ideal cycle efficiency

A projectile launcher is used to launch a 0.5 kg ball into the air. The

launcher is connected to a 1-kg mass and starts from rest with the spring compressed to a

length of 15 cm. The unstretched length of the spring is 75 cm. When the launcher is

released from rest, the 1-kg mass will impact the ball and the ball will project in the air.

Determine a suitable spring constant and angle θ for the ball to reach a maximum height of

20 m (measure from the current position of the ball). The Coefficient of restitution between

1-kg mass and ball is 0.8. (Note: first determine an arbitrary angle and find the spring

constant for that)

Calculate the mass moment of inertia for the thin parabolic plate about the x-x axis as shown in the figure below.

find response (deflection) y (x,t) of The Vibrating string Length (L=𝜋), end fixed

c²=1 if The initial displacement and Initial Velocity are:

y (x,0) = o , 𝑦'(x,0) =0.1 Sin2x.

y (x,0) = o , 𝑦'(x,0) =0.01x , if 0 ≤ 𝑥 ≤𝜋/2

𝑦'(x,0) =0.01(𝜋 -x) , if 𝜋/2≤ 𝑥 ≤ 𝜋

y (x,0) = 0.1 Sinx , 𝑦'(x,0) = - 0.25 Sinx.

41-50 An ideal reheat turbine with one stage of reheat receives steam at 9.0 MPa and 530°C. Reheat pressure is 0.83 MPa and exhaust pressure is 0.007 MPa. The work is 1559 kJ/kg and the thermal efficiency is 41.05%. Find the temperature of steam leaving the reheater.

1. The bent beam ABC is attached to a pin C and rests against a roller support at B. Neglecting the weight of the beam, find the magnitude of the reactions at B and C caused by the 150- kg load.