Explain the following briefly :

Redundancy

Availability

Maintainability

Air enters the compressor of a regenerative air-standard Brayton cycle with a volumetric flow rate of 60 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.

Problem 8.045 SI

Consider a regenerative vapor power cycle with two feedwater heaters, a closed one and an open one, and reheat. Steam enters the first turbine stage at 12 MPa, 560°C, and expands to 2 MPa. Some steam is extracted at 2 MPa and fed to the closed feedwater heater. The remainder is reheated at 2 MPa to 520°C and then expands through the second-stage turbine to 0.3 MPa, where an additional amount is extracted and fed into the open feedwater heater operating at 0.3 MPa.

The steam expanding through the third-stage turbine exits at the condenser pressure of 60 kPa. Feedwater leaves the closed heater at 210°C, 12 MPa, and condensate exiting as saturated liquid at 2 MPa is trapped into the open feedwater heater. Saturated liquid at 0.3 MPa leaves the open feedwater heater. Assume all pumps and turbine stages operate isentropically.


Determine for the cycle:

(a) the heat transfer to the working fluid passing through the steam generator, in kJ per kg of steam entering the firststage turbine.

(b) the percent thermal efficiency.

(c) the heat transfer from the working fluid passing through the condenser to the cooling water, in kJ per kg of steam entering the first-stage turbine.

The 4 lb particle is subjected to the action of its weight and forces F1={2i+6j−2tk}lb, F2={t2i−4tj−1k}lb, and F3={−2ti}lb, where t is in seconds. Determine the distance the ball is from the origin 5 s after being released from rest.
(Figure 1).

A tank contains 21 kg of dry air and 0.3 kg of water vapor at 30°C and 100 kPa total pressure. Determine

(a) The specific humidity

(b) The relative humidity

(c) The specific enthalpy of the mixture in the tank as (kJ/kg-mixture) (calculate by hand)

(d) The specific enthalpy of the mixture in the tank as (kJ/kg-dry air) (calculate by hand)

(e) Explain (in 1-2 sentences) the difference between the values in c and d – which value agrees with the enthalpy value in the psychrometric chart at this condition?

A circular loop which possesses 55 turns is placed in a uniform magnetic field. The direction of the magnetic field makes an angle of 70 o with respect to the normal direction to the loop. The magnetic field strength B is increased at a constant rate from B1 =3T to B2 =17T in a time interval of 20 s. If Ф1 is 3.99 Wb,

a) What is the radius of the wire? (PLEASE THOROUGHLY EXPLAIN)

b) What is the EMF?

c) What is the current if the electrical resistance of the loop is 7 ohms?

What you are to do is select a specific material (although the selection does not have to be approved by the Instructor, it cannot be generic [e.g., metal] but instead must be specific [e.g., 6061 aluminium metal alloy or PMMA polymer]). For the material chosen you will need to determine some material specifications, properties, attributes (availability, cost, fabricability, service life, colour, texture, etc.) that make this material unique and interesting to you. Also tell me about some of the applications for this material and why you think the material was chosen for those applications.

What is profitability Index? Given the discount rates and the future cash flows of each project, which project should they accept using Profitability Index?

Air enters the compressor of an air-standard Brayton cycle with a volumetric flow rate of 60 m³/s at 0.8 bar, 280 K. The compressor pressure ratio is 17.5, 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%.


Determine:

(a) the net power developed, in kW.

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

(c) the percent thermal efficiency of the cycle.

Need some help with those questions. Thank you so much

Manufacturing Technology

1. The effects of cutting fluids on biological considerations and the environment.

2. Find out method in face milling and end milling operation.
(i) procedure
(ii) application

3. Summarize the centerless grinding, cylindral grinding, surface grinding in 4 line.

4. What are the difference on the operation between sensitive drill press and radial drilling machine