Neiep 300 Questions and Answers

How should ammeters be used to take measurements in a circuit - Answer-Connected in series with the circuit What will happen to the current in a circuit if the resistance is doubled - Answer-Current will be halved How do you measure voltage in a circuit - Answer-Meter must be parallel with volt being measured What is the outermost shell of an atom called - Answer-Valence shell The Nucleus of an atom contains what - Answer-Neutrons and protons Whats the E symbol represent in ohms law - Answer-Voltage What happens to the total resistance in a wire if the length is doubled - Answer-Resistance is doubled If an atom has only one electron in its valence shell _______? - Answer-Atom will act as a good conductor Unlike charges ______? - Answer-Attract A neutral atom has _____? - Answer-equal number protons and electrons What is the name of the unit measuring current - Answer-amperes Describe current flow - Answer-Uniform movement of electrons from negative to positive What is the unit that measures the quantity of electrons passing a given point - Answer-CoulombName the unit used in measuring the potential difference across two points in a circuit - Answer-Volt What is the unit to measure opposite to current flow - Answer-Ohms What happens to resistance in a wire, if its width is increased four times - Answer-Resistance is 1/4 What does the designation DPDTNO switch represent - Answer-Double-pole, Double-Throw, Normally Open switch _____ refer to the moveable contacts on a switch - Answer-Poles Contact wear is always _______ on DC switches than AC switches - Answer-greater Describe maintained contact switch action - Answer-When the switch is actuated once, contacts close an remain close What type of switch would be found at a terminal landing - Answer-Unidirectional limit switch What are the resistance band colors - Answer-Black, Brown, Red, Orange, Yellow ,Green, Blue, Violet, Grey, White What is the tolerance on a gold band resistance - Answer-5% What is the tolerance on a silver band resistance - Answer-10% What is the tolerance when there is no band color - Answer-20% Which resistor has a single fixed terminal and shaft driven, moveable contact - Answer-RheostatCarbon film resistors have which characteristic - Answer-Maintain close tolerances in response to temperature changes _____ have a negative temperature coefficient - Answer-Thermistor Filament resistance increases when bulb is energized - Answer-Incandescent bulbs Fluorescent lamps produce _______ the lumens per watt compared to incandescent lamps - Answer-2x How are switches rated? - Answer-by max current switch can pass when closed What happens to voltage in a series circuit - Answer-Voltage drop is directly proportional to resistance Describe current in a SERIES circuit - Answer-Value of current remains same at any point When resistors are placed in _____, the total circuit resistance decreases - Answer-Parallel How many cycles per revolution would be developed from a single loop rotating in a fourth pole AC generator - Answer-2 Wave form that has equal alternating horizontal times of 2 fixed values of equal instantaneous vertical rise and fall times - Answer-Square wave