A PM DC motor with torque constant kPM is used to power a hydraulic pump; the pump is a positive displacement type and generates a flow proportional to the pump velocity: qp = kp?. The fluid travels through a conduit of negligible resistance; an accumulator is included to smooth out the pulsations of the pump. A hydraulic load (modeled by a fluid resistance R) is connected between the pipe and a reservoir (assumed at zero pressure). Sketch the motor-pump circuit. Derive the dynamic equations for the system, and determine the transfer function between motor voltage and the pressure across the load.
What will be an ideal response?
Analysis:
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After a compressor has been turned off, enough time should be permitted to pass to allow the ____ before it is restarted.
a. pressure in the system to increase b. charge in the evaporator to reverse c. charge in the condenser to stabilize d. pressure in the system to equalize
The voltmeter and ohmmeter are generally contained in the same meter. These meters are called ____________________.
Fill in the blank(s) with the appropriate word(s).
The International Building Code (IBC) specifies that the height of a riser shall not exceed 7 3/4 inches and that the width of a tread not be less than ____ inches.
a.10 b.12 c.14 d.16
If you push on your textbook so that it slides across the table at a constant velocity,
a. there must not be any forces acting on the book, otherwise it would accelerate. b. all of the forces acting on the book must be balanced. c. the book must be changing direction. d. none of the above