Mechanical Engineering Answers

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6. Steam expands isentropically from 2 MPa and 375 o C to a final temperature of 95 o C.

Find the final quality and the work for a non-flow and steady flow processes.

5. There are 3 kg/min of steam undergoing an isothermal process from 30 bar and 350 o C

to 7 bar. (note 1 bar = 100 kPaa). Find: a) ΔS (kJ/k), b) Heat transferred (kJ), c) ΔH

(kJ), d) ΔU (kJ)

4. To what temperature must a rigid tank containing dry and saturated steam at 130 o C be

cooled to yield a mixture of 25 % quality.

3. A 2-kg steam water mixture at 1.0 MPaa is contained in an inflexible tank. Heat is

added until the pressure rises to 3.5 MPaa and the temperature to 400 o C. Determine:

a) Heat transferred (kJ), b) ΔH (kJ), c)ΔS (kJ/k)

2. A piston-cylinder containing steam at 700 kPaa and 250 o C undergoes a constant

pressure process until the quality is 70%. Determine: a) Heat transferred, b) Δu, c)Δs,

d) W n

1. Steam with an enthalpy of 2843 kJ/kg m undergoes a constant pressure process at 0.8

MPaa until the enthalpy becomes 2056 kJ/kg m . Find: a) Heat transferred, b) Δu, c)Δs,

d) final temperature.

Q1: An overhang beam ABCD is simply supported at A and C. The beam carries a uniformly distributed load of 4kNm^-1 over the entire span, a concentrated load of 40kN at B and a concentrated load of 20kN at D. what is the reaction forces at A and C are ?

Q2: An overhang beam ABCD is simply supported at A and C. The beam carries a uniformly distributed load of 4kNm^-1 over the entire span, a concentrated load of 40kN at B and a concentrated load of 20kN at D, as shown in the Figure. The reaction forces at A and C are 22 kN and 86 kN respectively. The bending moment equation for section AB, is?

Q3. A cantilever beam having a cross-section shown in the figure is subjected to a uniformly distributed load and a concentrated load. The Young’s modulus of the beam material is 200GPa. What is the deflection at the free end B?  

An aircraft touches down at a speed of 200 km/hour and the brakes are applied. If the aircraft deceleration is given by 𝑎 = −0.05 𝑣 (using units of metres and seconds), how far will it have travelled along the runway by the time its speed drops to 20 km/hour? 

Figure 1 shows a layer of oil (8.95 kN/m3), the thickness of 0.3 mm, between two parallel 

flat plates. The upper plate is pulled across the bottom plate with a cable connected to 

a winch. The upper plate moves with a velocity of 0.05 m/s. The area of contact between 

the upper plate and the oil is 1.5 m2. Determine the kinematic viscosity of the oil if the 

torque acting on the winch drum should not exceed 24.5 x 10-3 Nm. Take the drum 

diameter as 50 mm.