ASME PART PEB SECTION I

Requirements for electric boilers.

asme_part_peb_section_i electric

Related Terms

DISTORTION

Any undesired change in the waveform of an electric signal passing through a circuit or other transmission medium.
In general, the extent to which a system fails to accurately reproduce the characteristics of an input signal at its output.
Any undesired change in the waveform of a sound wave.

sound input_signal electric transmission signal system distortion circuit input

POOLE-FRENKEL EFFECT

An increase in the electrical conductivity of insulators and semiconductors in strong electric fields.

poole-frenkel_effect conductivity electric

POLARIZABILITY

The electric dipole moment induced in a system, such as an atom or molecule, by an electric field of unit strength.

polarizability electric_dipole electric moment field unit atom electric_field electric_dipole_moment

1. Braking an electric motor by reversing its connections, so it tends to turn in the opposite direction; the circuit is opened automatically when the motor stops, so the motor does not actually reverse. 2. The formation of a barrier (plug) of solid material in a process flow system, such as a pipe or reactor.

plugging motor process barrier turn electric pipe electric_motor circuit flow material solid

PLANT FACTOR

The ratio of the average power load of an electric power plant to its rated capacity. Also known as capacity factor.

plant_factor electric ratio capacity load average electric_power_plant electric_power plant power

PLASMA TORCH

A torch in which temperatures as high as 50,000 C are achieved by injecting a plasma gas tangentially into an electric arc formed between electrodes in a chamber; the resulting vortex of hot gases emerges at very high speed through a hole in the negative electrode, to form a jet for welding, spraying of molten metal, and cutting of hard rock or hard metals.

plasma_torch speed electric vortex high form jet electric_arc rock hard gas hole cutting arc c

PIEZOELECTRIC TRANSDUCER

A piezoelectric crystal used as a transducer, either to convert mechanical or acoustical signals to electric signals, as in a microphone, or vice versa, as in ultrasonic metal inspection.

piezoelectric_transducer electric mechanical ultrasonic crystal metal

PIEZOELECTRIC ELEMENT

A piezoelectric crystal used in an electric circuit, for example, as a transducer to convert mechanical or acoustical piezoelectric element piezoelectric gage signals to electric signals, or to control the frequency of a crystal oscillator.

piezoelectric_element transducer electric piezoelectric_element frequency mechanical piezoelectric_gage element crystal

PICKOFF

1. A device used to convert mechanical motion into a proportional electric signal. 2. A mechanical device for automatic removal of the finished part from a press die.

pickoff part electric mechanical automatic motion device

PHASE-COMPARISON RELAYING

A method of detecting faults in an electric power system in which signals are transmitted from each of two terminals every half cycle so that a continuous signal is received at an intermediate point if there is no fault between the terminals, while a periodic signal is received if there is a fault.

phase-comparison_relaying point fault electric electric_power_system signal half_cycle system two electric_power power