National Elevator Industry Educational Program 300 Questions and Answers
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_____ have a negative temperature coefficient -ansThermistor
_____ refer to the moveable contacts on a switch -ansPoles
A neutral atom has _____? -ansequal number protons and electrons
Ability of material to retain it magnetism is called -ansRetentivity
AC value that produces same heat dissipation in a resistor as an equivalent value as DC -anseffective value
according to the domain theory of magnesium ______ -ansElectrons can spin in either directions
as current decreases through the loop, the ______ the magnet becomes -ansWeaker
Carbon film resistors have which characteristic -ansMaintain close tolerances in response to temperature
changes
Contact wear is always _______ on DC switches than AC switches -ansgreater
Describe current flow -ansUniform movement of electrons from negative to positive
Describe current in a SERIES circuit -ansValue of current remains same at any point
Describe maintained contact switch action -ansWhen the switch is actuated once, contacts close an remain
close
, Ease with which magnetic lines of force distribute themselves throughout material is referred to as? -
ansPermeability
Filament resistance increases when bulb is energized -ansIncandescent bulbs
Fluorescent lamps produce _______ the lumens per watt compared to incandescent lamps -ans2x
How are switches rated? -ansby max current switch can pass when closed
How can permanent magnets be damaged -ansMechanical shock
How do you measure voltage in a circuit -ansMeter must be parallel with volt being measured
How many cycles per revolution would be developed from a single loop rotating in a fourth pole AC generator -
ans2
How should ammeters be used to take measurements in a circuit -ansConnected in series with the circuit
If an atom has only one electron in its valence shell _______? -ansAtom will act as a good conductor
Magnetic lines of force form a closed loop is called -ansMagnetic Circuit
Magnets created by flow of electricity are called -ansElectro magnets
Moveable portion of a relay is called -ansarmature
rated 100%
_____ have a negative temperature coefficient -ansThermistor
_____ refer to the moveable contacts on a switch -ansPoles
A neutral atom has _____? -ansequal number protons and electrons
Ability of material to retain it magnetism is called -ansRetentivity
AC value that produces same heat dissipation in a resistor as an equivalent value as DC -anseffective value
according to the domain theory of magnesium ______ -ansElectrons can spin in either directions
as current decreases through the loop, the ______ the magnet becomes -ansWeaker
Carbon film resistors have which characteristic -ansMaintain close tolerances in response to temperature
changes
Contact wear is always _______ on DC switches than AC switches -ansgreater
Describe current flow -ansUniform movement of electrons from negative to positive
Describe current in a SERIES circuit -ansValue of current remains same at any point
Describe maintained contact switch action -ansWhen the switch is actuated once, contacts close an remain
close
, Ease with which magnetic lines of force distribute themselves throughout material is referred to as? -
ansPermeability
Filament resistance increases when bulb is energized -ansIncandescent bulbs
Fluorescent lamps produce _______ the lumens per watt compared to incandescent lamps -ans2x
How are switches rated? -ansby max current switch can pass when closed
How can permanent magnets be damaged -ansMechanical shock
How do you measure voltage in a circuit -ansMeter must be parallel with volt being measured
How many cycles per revolution would be developed from a single loop rotating in a fourth pole AC generator -
ans2
How should ammeters be used to take measurements in a circuit -ansConnected in series with the circuit
If an atom has only one electron in its valence shell _______? -ansAtom will act as a good conductor
Magnetic lines of force form a closed loop is called -ansMagnetic Circuit
Magnets created by flow of electricity are called -ansElectro magnets
Moveable portion of a relay is called -ansarmature
