The A/C cutout relay is being discussed. Technician A says the PCM keeps the compressor engagement circuit open when the engine is operated at WOT. Technician B says the compressor cutout relay closes immediately after the engine starts. Who is correct?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A nor B
Answer: A
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An uninsulated gas turbine receives air at 1000 kPa, 800oC, at a mass flow rate of 12.0 kg/s. The air exits at 100 kPa, 420oC. The turbine produces 4.10 MW of power.
(a) Determine the heat transfer rate for the turbine. (b) Using your turbine model, plot the required heat transfer rate for exit temperatures varying between 400°C and 500°C, with the other conditions remaining the same. (c) Using your turbine model and the original conditions, plot the variation in power produced as the heat transfer rate varies between 0.0 MW and -3.0 MW. Given: P1 = 1000 kPa; T1 = 800°C; P2 = 100 kPa; T2 = 420°C; m?= 12.0 kg/s; W?=4.10 MW=4,100 kW; Air (Take State 1 as the inlet, State 2 as the outlet.) Assume: For a turbine, assume steady-state, steady-flow, single-inlet, single-outlet flow, with ?KE = ?PE = 0
Which of the following control devices is often used in both a primary and a secondary control role?
a. Pressure switches b. Humidistats c. Rupture disks d. Condenser water valves
A fuse protects an electrical circuit:
A) By melting when excessive current flows through it, opening the circuit. B) Using a heat motor that operates an imbedded set of contacts to open the circuit. C) Limiting the voltage that can flow through the fuse. D) Using a material that limits the amount of current that can pass through the fuse due to the increase in the material's resistance.
Answer the following statement(s) true (T) or false (F)
1. Function is the purpose or intended use of a product. 2. Function is an abstract formulation of the task independent of any particular solution. 3. Behavior is defined as “the manner in which something acts under given circumstances.” 4. Behavior is viewed as an observable characteristic of the function exhibited or manifested by the design structure.