What type of directional valve is used to control the forward and reverse of a double-acting hydraulic piston?
a) 3 way/ 2 position
b) 4 way/ 2 position
c) 4 way/ 3 position

and why?

1. An aluminum circular cylinder 50 mm in diameter with ends insulated is initially at 100◦C. Approximate the temperature at the center of the cylinder after 2 s if the lateral surface is kept at 0◦C.For aluminum, k = 8.6 × 10−5m² /s.

2. A circular cylinder 1 m in radius is completely insulated and has an initial temperature distribution 100r ◦C. Find an expression for the temperature as a function of r and t. Write integral expressions for at least three coefficients in the series expansion.

In one batch of nickel (Ni)-plated cast iron components, you observed that there were minute pores in the Ni surface coating growing down to the cast iron surface.Should you allow this batch of nickel (Ni)-plated cast iron components be used for a water treatment application? Will the component be susceptible to corrosion and what form of corrosion could occur?

Aquaplaning(General Question)

What is happening physically when a pontoon of a floatplane begins to aquaplane. Like are forces from water on the floats less because its not fully submerged anymore?

The Lockheed SR-71 Blackbird aircraft cruises at Mach number of 3.3 at an altitude of 85,000 ft. Calculate the speed of sound and flight speed at these conditions. Compare the flight speed to the muzzle speed of a 30-06 rifle bullet (700 m/s).

A rigid tank of volume 0.63 m3 initially has some air inside at 0.5 bar and 300 K. A hole develops in the wall, and air from the surroundings at 1 bar, 300 K flows in until the pressure in the tank reaches 1 bar. Heat transfer between the contents of the tank and the surroundings is negligible. The final temperature is 350 K. Use the transient state entropy balcance to find the entropy generation of the process

A steam thermoelectric plant operates a Rankine cycle with overheating. Water enters the pump as saturated liquid , 7.7 kg/s. The efficiency of the pump is 0.9 The water enters the high pression turbine at 12 500 kPa and 550°C, after that steam overheats at a constant pressure of 2000 kPa until 450°C before it expands on the low pressure turbine. The efficiency of both turbines is 0.85. The vapor quality when it enters to the condenser is 0.95 Determine the thermal efficiency of the cycle.

Prepare 5 pages (max. ) brief description about Multiphase flow pumps that work at high gas volume fraction or percentage ( high GVF).

The report should address the following important points:

1- Differences between multiphase flow pump (for gas and liquid mixture) and single phase flow pump (for liquid).

2-Difference between multiphase (gas-liquid) flow pump at high gas percentage (say 80% and above gas) and a compressor.

3-Differences in pump head, pump speed, design and stages should be addressed.

4-How can we modify a single phase flow pump (liquid only) to handle gas-liquid flow

5-How can we modify a gas-liquid flow pump to handle gas percentage rather than low percentage of gas

What are the advantages and disadvantages of the PI controller, PD controller and PID controller ?

ADVANCED DYNAMICS AND CONTROL SYSTEMS

Develop a maintenance/life cycle plan for your house/car. It shall include at least 8 items that are done over the life cycle of the system and go out for at least 5 years.

A certain process requires 2.8 cfs of water to be delivered at a pressure of 30 psi. This water comes from a large-diameter supply main in which the pressure remains at 60 psi. If the galvanized iron pipe connecting the two locations is 200 ft long and contains six threaded 90o elbows, determine the pipe diameter. Elevation differences are negligible.

You are investigating two sensors to use in an experiment. Sensor A has area 600 ± 0.3 mm2 and the gap thickness is 0.3 ± 0.01 mm. Sensor B has area 400 ± 0.25 mm2 and the gap thickness is 0.2 ± 0.02 mm. Estimate the relative (hint: this is a %) and absolute uncertainties (hint: this has units of capacitance) in capacitance for both sensors. Your experiment requires that the capacitance is measured accurately within 5%. Which would you select for your experiment? Justify your response.

C = 8.85 × 10^?15 F/mm A/t

A steam generator consists of a bank of stainless stell (k=15 W/m·K) tubes habing the core configuration of CF7.0-5 and an inner diameter of 13.8 mm. The tubes are installed in a plenum whose square cross section is 0.6 m on a side, thereby providing a frontal area of 0.36 m². Combustion gases whose propertires may be aproximated as those of atmospheric air, enter the plenum at 900 k and pass in cross flow over the tubes at 3 kg/s. There are 11 rows of tubes in the gas flow direction. If saturated water at 2.455 bar experiences boiling in the tubes, what is the gas exit temperature? A convection coeficient of 10.000 W/m²·K is associated with boiling in the tubes.

AEROSPACE ENGINEERING PROBLEM

EDITED.

(20 pts) A spacecraft is launched on a mission to Mars starting from a 300 km
circular parking orbit. Calculate the departure angle, of the departure hyperbola.

May I please get some help, Thank You