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1. Why are most precipitation-hardened alloys suitable only for relatively low-temperature applications?
2. Explain the three basic steps encountered during precipitation hardening.
3. What is aging? Why is this step needed in precipitation hardening?
4. What do the terms ‘‘natural aging'' and ‘‘artificial aging'' mean?
a differential thermocouple with sensors at the inlet and exit of a pump indicates that the temperature of water rises
a block of mass mb 5 kg is suspended from a cable of stiffness k 300 nm. the block is acted upon by a vertical force
Fracture-mechanics-based structural integrity assessment of the steam drum based on the current NDE data, and hence establish the lower-bound margins of safety under test and operating conditions.
material a has a fracture toughness and yield stress ten times that of material b a write an expression for the
Steam enters a two-stage adiabatic turbine at 8 MPa and 550ºC (State 1) and is expanded to 2 MPa (State 2) in the first stage of expansion. This steam is reheated at constant pressure to 550ºC (State 3) before entering the second stage of expansion.
a double pipe heat exchanger has an effectiveness of 0.5 when the flow is counter current and the thermal capacity of
a door 1 m wide and 1.5 m high is located in a plane vertical wall of a water tank. the door is hinged along the upper
a refrigeration cycle uses refrigerant 134-a as the working fluid. the refrigerant leaves the evaporator as a saturated
An adiabatic piston cylinder contains 1 kg of R-134a. Initially the conditions inside the piston are 200 kPa and 0 degrees C. An electric heater inside the device runs with constant voltage of 110 V and a constant 0.1A of current for one hour.
a ball is projected from point a with a inital speed of v at an angle of 25 degrees above the x-axis. the ramp ab is at
a. an adiabatic turbine expands steam from 500c 3.5 mpa to 200c and 0.3mpa . if the turbine generates 750 kw. what is
You need to hydrolyze 500 lb/day of an ester at an initial concentration of 5 molar in basic, aqueous solution. The ester has a MW of 120. The product must be 99% hydrolyzed. In bench top experiments at 40C, it is found that 50% of the ester hydrolyz..
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