391 ÷ 17 =
A) 23 r3 B) 22 r15 C) 21 r7 D) 23
D
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Which of the following statements is true for an adiabatic, reversible, steady-state compressor? Assume “the system” is defined as the fluid inside the compressor.
A. The efficiency of the reversible compressor can be calculated as a function of the inlet temperature (TC) and outlet temperature (TH). B. The change in entropy for the system, the surroundings, and the universe are all zero. C. The process described is impossible because heat must be rejected to a TC reservoir, which means the system cannot be adiabatic. D. The process description results in -1 degrees of freedom, so the system is impossible. E. None of the above is true.
When friction between two surfaces causes metal to be displaced, this is referred to as ______________.
Fill in the blank(s) with the appropriate word(s).
Fill in the blank(s) with the appropriate word(s).
Match each item with a statement below.
A. an arbitrary coding scheme that uses the numbers from 0 to 127 to represent alphanumeric characters and symbols B. a technique that changes the height of a carrier wave in response to a change in the height of the input signal C. a signal in which the intensity varies continuously and smoothly over a period of time D. the number of times that a carrier signal changes per second E. an analog wave having a frequency that a receiver is tuned to F. a method of encoding a digital signal onto an analog carrier wave G. a technique that changes the number of wave cycles in response to a change in the amplitude of the input signal H. the sequence of changing frequencies used in FHSS I. a binary signaling technique that increases the voltage to represent a 1 bit but provides no voltage for a 0 bit J. a technique that changes the starting point of a wave cycle in response to a change in the amplitude of the input signal