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Electrical Engineering
HVAC Chap 11
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Gravity
Terms in this set (25)
___ is the energy produced from the flow of electrons through a conductor.
Electricity
___ law expresses the relationship between voltage, current, and resistance in a circuit.
Ohm's
A(n) ___ is a device that performs work.
load
___ is sine wave distortion from motors and electrical devices that enters a power distribution system directly on the wires/grounds or through the magnetic coupling of adjacent wires.
Noise
A ___ circuit is a circuit that has two or more components connected so that there is one path for current to flow.
series
___ is the amount of electrons flowing through a conductor.
Current
A ___ circuit is a circuit that has two or more components connected so that there is more than one path for current to flow.
parallel
The opposition of current flow is called ___.
resistance
___ is the production of current flow due to a magnetic field on a coil.
Inductance
Three-phase AC voltage is a combination of three alternating voltage waveforms, each displaced ___ electrical degrees apart.
120
___ is the international unit of frequency equal to one cycle per second.
Hertz
Transient voltages are often caused by lightning or stored voltages being released from ___.
capacitors
A ___ transformer has a lower output voltage than input voltage.
step-down
A(n) ____________________ power plant is a power plant that generates both electricity and heat for use.
cogeneration
A(n) ____________________ is the interconnection of conductors and electrical elements through which current is designed to flow.
electrical circuit
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Verified questions
ENGINEERING
A steam turbine receives steam at 6 MPa, 800$^{\circ} \mathrm{C}$. It has a heat loss of 49.7 kJ/kg and an isentropic efficiency of 90%. For an exit pressure of 15 kPa and surroundings at 20$^{\circ} \mathrm{C}$, find the actual work and the reversible work between the inlet and the exit.
ENGINEERING
A sprinter reaches his maximum speed $v_{max}$ in 2.5 seconds from rest with constant acceleration. He then maintains that speed and finishes the 100 yards in the overall time of 9.60 seconds. Determine his maximum speed $v_{max}$.
ENGINEERING
A position control is to be designed with a 10% overshoot, a settling time of 1 second, and K$_{v}$ = 1000. You have on hand an amplifier and a power amplifier whose cascaded transfer function is K$_{1}$/(s + 40) with which to drive the motor. Two 10-turn pots are available to convert shaft position into voltage. A voltage of $\pm$ 20$\pi$ volts is placed across the pots. A dc motor whose transfer function is of the form $$ \frac{\theta_{o}(s)}{E_{a}(s)}=\frac{K}{s(s+a)} $$ is also available. The following data are observed from a dynamometer test at 50 V. At 25 N-m of torque, the motor turns at 1433 rpm. At 75 N-m of torque, the motor turns at 478 rpm. The speed measured at the load is 0.1 that of the motor. The equivalent inertia, including the load, at the motor armature is 100 kg-m$^{2}$ and the equivalent viscous damping, including the load, at the motor armature is 50 N-m-s/rad. a. Draw a complete block diagram of the system, specifying the transfer function of each component. b. Design a passive compensator to meet the requirements in the problem statement. c. Draw the schematic of the compensator showing all component values. Use an operational amplifier for isolation where necessary. d. Use MATLAB or any other computer program to simulate your system and show that all requirements have been met.
ENGINEERING
Saturated water vapor at 5 bar undergoes a process in a closed system to a final state where the pressure is 10 bar and the temperature is $200^\circ C.$ Can the process occur adiabatically? Explain.
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