The figure below provides the T–s diagram of a Carnot heat pump cycle for which the substance is ammonia, where x₃ = 70%.

Determine the net work input required, in kJ, for 50 cycles of operation and 0.1 kg of substance.
Note that work is positive going into the heat pump.

A mass flow rate of 2 kg/s of steam is expanded in an adiabatic turbine with an isentropic efficiency of 0.92. The steam enters at 3 MPa and 400 C and leaves at 30 kPa. Determine how much power the turbine is producing. Express your result in kW.

(Sol: 1649 kW)

TAKE YZ = 34

A recent public relations fiasco has intensified demand for engine testing for a particular OEM of
agricultural machinery. Historically, these engines are estimated to have a constant failure rate of 7
failures per 10000 + YZ (ten thousand + YZ) hours.
A local TV station is testing the engines under two different trials (25 hours and 100 hours)
What is the reliability of a single engine after 25 hours AND 100 hours?

What is the probability of no failed engines, a single failed engine, and more than one failed
engine, if the engines are tested in batches of 5 engines? Use the Poisson method and fill in the table on
the next page, for both the 25 hour test and the 100 hour test. (show one sample calculation below)

0 failed 1 failed >1 failed TOTAL
100.00 % (25 hours)
100.00 % (100 hours)
Two separate third party labs are also testing the engine but using some different criteria.
Number of engines tested Number Failed
Lab 1 220+YZ 43
Lab 2 127 25
Formulate the hypothesis comparing the two labs, using the Z test for binomial trials (difference in
proportions). What significance did you find?

The fit Φ 50M7/n6 is

Given your registration ID as: 0 - AB - XYZV ( 0 -17-7625) If the position of a particle moving in a straight line is given as function of time by: s ( t ) = ( t − x ) ( t − y ) ( t − z )

1- Plot the s - t curve, v - t curve and a - t curve

2- Find the average velocity and average speed through a time interval t =max(X,Y,Z ) .

3- Plot the path of the particle.

4- Find the max instantaneous velocity.

5- The speed of the particle at the beginning of motion

A 1-cm diameter UO2 fuel rod with zirconium clad of thickness 0.025 cm develops 16.4 kW/m. The coolant heat transfer coefficient is 7000 W/m2 oC, and the fluid saturation temperature is 280 oC. Assume any missing data, and write all assumptions

Questions

1) Write the 1D steady state conduction equation of the fuel rod and the clad,

2) Find the thermal conductivity of the fuel and the clad,

3) Specify the boundary conditions,

4) Write the solution of the equation for the fuel and the clad,

5) Compute the heat flux at the surface of the fuel,

6) What is the temperature at the center of the fuel rod?

7) What is the temperature at the surface of the fuel rod?

8) What is the temperature at the surface of the clad?

9) How much the maximum and minimum temperatures and where is each?

10) What is the total rate of heat (Watts) at the fuel-clad interface and coolant-clad interface?

Air enters the compressor of a regenerative air-standard Brayton cycle with a volumetric flow rate of 20 m³/s at 0.8 bar, 280 K. The compressor pressure ratio is 20, and the maximum cycle temperature is 1950 K. For the compressor, the isentropic efficiency is 92% and for the turbine the isentropic efficiency is 95%.


For a regenerator effectiveness of 86%, determine:

(a) the net power developed, in MW.

(b) the rate of heat addition in the combustor, in MW.

(c) the percent thermal efficiency of the cycle.

1) A gas turbine operates on an ideal Joule cycle using air (γ = 1.4; R = 0.287 kJ/kg K) as working fluid. Air enters the compressor at temperature of 27◦C and pressure of 1.25 bar and is compressed to 7.6 bar. When the maximum cycle temperature is limited to 800 oC, calculate,

(i) the thermal efficiency and work ratio of the cycle

(ii) the temperature of air exiting the turbine and the change in specific entropy of turbine process if the isentropic efficiency of the turbine is 85%.

2) For an ideal Joule cycle, discuss the effects of pressure ratio on the thermal efficiency using T-s diagram.

Water ( ρ= 1000 kg/m3; Cp= 4.2 kJ/kg.K; k= 0.58 W/m.K ) at 1,537 kg/hr and 26oC enters a 10-mm-diameter smooth tube whose wall temperature is maintained at 79oC. If the water's Nusselt number (Nu) = 375, and the tube length is 7.6, calculate the water outlet temperature,in oC.

V5 What is the water elevation in reservoir B given the following:

Elevation of reservoir A =2250m. The flow is 25m^3/sec. the temperature is 20C

there are two pipes in series with the following characteristics

D1 L1 D2 L2

2 m 1500m 1.6m 1000m

There are gate valves at the exiting and entering the reservoirs

There are two bends, 1 in each pipe size.There is is a globe valve on the downstream pipe.

What is the elevation of Reservoir B?

Crude oil is rarely produced alone as it is generally commingled with water that creates a number of problems during oil production. Emulsion is a dispersion of droplets of one immisicible liquid into another. Evaluate the factors influencing the stability of emulsions

Could anyone tell me the best you tube channel or free Unacademy tutor(India) for best learning of Shear force and bending moment diagram along with deflection?

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A generous amount of gel is applied to the surface of the window of an ultrasound probe prior to its use. The window is made of a polycarbonate material of density ρ = 1200 kg/m3, thermal conductivity k = 0.2 W/m · K, and specific heat cp = 1200 J/kg · K. The probe is initially at a temperature of Ti = 20°C. To ensure that the gel remains adhered to the probe until the probe is brought into contact with the patient's skin, its temperature-dependent viscosity must not fall below a critical value. This corresponds to a requirement that the maximum gel temperature remain below 12°C prior to making contact with the patient. Determine the required initial gel temperature. The thermal conductivity, density, and specific heat of the gel may be assumed to be those of liquid water.

The correct method is to use the Surface Convection of Transient Conduction (Case 3 in Theodore Bergman, Adrienne Lavine 8th edition - Page 289, Equation 5.66)