Chapter 6 Electrical Systems Nocti Questions with correct Answers

If the meter function is set for AC voltage, a "no voltage" reading taken across a fuse in a powered circuit indicates that the - Answer- fuse is good A test instrument that displays a waveform is an - Answer- oscilloscope When initially using an ammeter, set the range switch at the ___________________ - Answer- highest range Install surge protection on electrical equipment to - Answer- shield equipment from sudden power increases a photo detector converts light into - Answer- change in resistance When measuring DC voltage, the meter should be connected - Answer- parallel Within the same transformer, the volt-amperes of the primary and the volt-amperes of the secondary are - Answer- equal Select electrical component listed below that uses the below schematic symbol - Answer- resistor Circuit breakers are wired in __________ with the load - Answer- series A DPDT relay has _____ set of contacts - Answer- 2 The AC voltage wave form is called a ______ wave - Answer- sine An electrical component referred to as a rheostat is a type of - Answer- variable resistor The primary function of the fuse(s) in a circuit should be to __________ - Answer- protect from short circuit The unit of capacitance is the _______. - Answer- farad In a simple DC circuit with a constant voltage, as resistance increases, current will - Answer- decrease Static friction is a form of - Answer- non-moving mechanical resistance A _______ measures electrical current - Answer- ammeter An electric inverter ______ - Answer- changes DC to AC The ______ is an electrical component that can hold a charge for a period of time - Answer- capacitor The equation for the basic unit of electrical power (the watt) is - Answer- P = I^2 * R When measuring DC milliamps, the meter should be connected in ________ - Answer- series In the diagram below, the load is represented by - Answer- 2 When measuring current, the meter should be connected in - Answer- series In a parallel circuit, the total resistance is _______ any individual resistance - Answer- less than a coil surrounding an iron core to which voltage has been applied is a - Answer- electromagnet The primary function of a DC power supply is to convert ____________ - Answer- convert AC to DC The resistance of a wire is a function of its length, diameter, and ___________ - Answer- material type Power in electrical systems can be expressed as - Answer- P = volts x amps Ohm's :aw states - Answer- R = E / I in a DC circuit below if R5 burns open, the total current - Answer- decreases Never use an ohmmeter on a circuit that might be __________ - Answer- energized with voltage The third color band on a resistor defines the - Answer- multiplier Because switches can fail after opening a disconnect, the safest practice is to - Answer- test the power circuit at the load (downstream) side of the disconnect When assembling a circuit board, the ______ is used to help identify the correct component used - Answer- resistor color chart A system is considered to have _________ elements if any single element can fail while still maintaining a completed circuit - Answer- parallel In the diagram below, the conductor is represented by - Answer- 3 According to the National Electrical Code (NEC), the standard color of ground wire is - Answer- green