An adiabatic steam turbine operates between state 1 at 6 MPa and 600°C, and state 2 at 10 kPa and x2 = 1.0. The turbine efficiency is nearest:
A) 92%
B) 87%
C) 81%
D) 77%
D) 77%
The maximum possible turbine work occurs if the entropy is constant, as in Problem 22 which is
1386 kJ/kg. The actual work is wT = h1 ? h2 = 3658 ? 2585 =1073 kJ/kg . The efficiency is then
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Which of the following is a major reason that most of the uncultivated but potentially arable lands of South America and Africa should not be used for agricultural production?
A) Their cultivation would increase global biological diversity. B) Their cultivation would aggravate global warming. C) They would contribute little to meeting food requirements. D) They would require expensive irrigation water for high productivity. E) They are too infertile.
A state transition diagram for designing a synchronous nonbinary counter should include:
A) the desired states in the expected sequence as well as the undesired states leading to a desired state. B) the desired and the undesired states in any sequence. C) the undesired states in their expected sequence as well as the desired in any sequence. D) the desired states in any sequence and the undesired states in their expected sequence.
In a parallel RL circuit, where one branch contains a resistor and a separate branch contains an inductor, if the inductive voltage is 3V and the resistive voltage is 3V, then the total voltage is ____________________V.
Fill in the blank(s) with the appropriate word(s).
____________________ drives operate by monitoring rotor position and changing the rotor's position as compared to its orientation to the stator field.
Fill in the blank(s) with the appropriate word(s).