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A compilation of exam questions and verified correct answers related to electrical engineering concepts. It covers topics such as series and parallel circuits, electromagnetism, grounding, power calculations, circuit breakers, transformers, and various electrical components. The questions are designed to test understanding of fundamental principles and practical applications in electrical circuits and systems. This resource is useful for students preparing for exams or professionals seeking to refresh their knowledge of electrical engineering concepts. Questions about electrical schematics, circuit laws, and electrical safety.
Typology: Exams
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When loads are connected in series, their individual resistances are __________.* Divided Added Subtracted Multiplied - answer>>>Added
The concept of a magnetic field being formed around a conductor when current flows through it is called __________.* Flux Capacitance All of the above Electromagnetism None of the above - answer>>>Electromagnetism
hat is the best way to verify that a piece of equipment is properly grounded?* Measure for current in the ground conductor. Touch the metal housing of the equipment. Measure the resistance between the equipment ground and the main ground lug. Disconnect and reconnect the ground conductor. - answer>>>Measure the resistance between the equipment ground and the main ground lug.
The contacts of a(n) __________ switch are open until acted on by the operator.* Normally open Normally closed Normally simulated
Adjacent - answer>>>Normally open
What is the total power of a series circuit if E = 75V and I = 50mA?* 1500 W 75 W 3.75 W .5 W - answer>>>3.75 W
Where are meter leads placed in a circuit to measure current in a single component or device?* Component input and ground Component output and ground Component input and output In series with the component - answer>>>In series with the component
Which of the following is a formula for calculating total resistance in a parallel circuit?* All of the above RT = 1/(1/R1 + 1/R2 + 1/R3) RT = ET × IT RT = R1 + R2 + R None of the above - answer>>>RT = 1/(1/R1 + 1/R2 + 1/R3)
What is the state of a capacitor if its resistance is continuously close to zero?* Fully Charged Charging Shorted Open - answer>>>Shorted
Which of the following electrical characteristics is not typically measured with a basic digital multimeter?* Current Resistance Voltage Frequency - answer>>>Frequency
What is the total opposition to flow of the circuit shown if the power supply frequency is 60 HZ and each of the coils have an inductance of 0.1H?* 113 Ohms 30 Ohms 63 Ohms 90 Ohms - answer>>>113 Ohms
Kirchoff's Voltage Law for a series circuit says that the total voltage is equal to __________.* The sum of the voltage drops The largest voltage drop The product of the voltage drops The smallest voltage drop - answer>>>The sum of the voltage drops
Which of the following is a formula for calculating power?* None of the above P = I × E P = E / R All of the above P = I × R - answer>>>P = I × E
What does an electrical schematic not show?*
Physical Connection Standard Symbols Conductors or Wires Indivual Components - answer>>>Physical Connection
A __________ circuit is one in which there is only one path for current to travel.* Closed Complex Parallel Series - answer>>>Series
Transformers are usually rated in units called __________.* Hertz Ohms Amperes Volt Amperes - answer>>>Volt Amperes
What is the the relationship between R3 and R4 in this circuit? - answer>>>They are in series
A simple method for opening or closing a circuit is to use a __________.* None of the above Switch Knife Screwdriver - answer>>>Switch
The difference between a fuse and a circuit breaker is __________.* None of the above Circuit breakers can be reset and used again Fuses are re-usable Circuit breakers are cheaper
What side of the of the transformer is connected to the power source?* Step-up side Primary coil Step-down side Secondary coil - answer>>>Primary coil
The electrical wall outlets at home are a source of __________ current.* None of the above Direct Alternating Both direct and alternating - answer>>>Alternating
A __________ is an electrical device that converts AC electricity from one voltage level to another.* Transformer Secondary coil Center tap Primary coil - answer>>>Transformer
Why does most electrical utility power throughout the world use AC instead of DC?* AC transmits more efficiently over long distance DC is more expensive to produce AC produces more power AC current is less dangerous - answer>>>AC transmits more efficiently over long distance
An ammeter is used to measure __________.* Current Voltage Temperature Resistance - answer>>>Current
What is a condition that exists when coils are so close that the magnetic force around one coil will cause a current to flow in another coil ?* Magnetism Capacitance Isolation Mutual Induction - answer>>>Mutual Induction
Which of the following circuits will not have current flow?* Circuit with more than one path Circuit with only one path Closed circuit Opened circuit - answer>>>Opened circuit
The energy stored by a capacitor is called a(n) __________.* Voltage spike All of the above Electrostatic charge Induced voltage - answer>>>Electrostatic charge
What is the status of the A & B Lamps when the pushbutton in this circuit is activated? - answer>>>Lamp A on and Lamp B off
What is the effect of inductive reactance in an AC circuit?* Aids Voltage Change Opposes voltage change Aids current change Opposes current change - answer>>>Opposes current change
Operators Conductors Knives Contacts - answer>>>Contacts
The measure of energy consumed by a circuit is called __________.* Dissipation Consumption Power Usage - answer>>>Power
Resistance is measured in units of __________.* Amps Ohms Volts Watts - answer>>>Ohms
A(n) __________ is used to measure resistance. - answer>>>Ohmmeter
What is the total measurement of voltage over the power source called? - answer>>>Applied Voltage
Rotary motion is the output of which electrical output device? - answer>>>Motor
Current is measured in units of __________. - answer>>>Amps
What step should be taken to correctly measure the resistance of a resistor that is wired in a circuit? - answer>>>Disconnect one end of the resistor
The resistance provided by an inductor in an AC circuit is called __________. - answer>>>Inductive reactance
What does hertz stand for on a sine wave graph? - answer>>>Cycles per second
What is the total inductance of a series circuit if the power supply frequency is 60 Hz and 3 coils each have an inductance of 0.3 henrys? - answer>>>0.9 Henrys
A common application of mutual inductance is found in a device called a __________. - answer>>>Transformer
What is the secondary voltage if the primary is 480VAC? (The primary coil have 300 turns and the secondary coil has 125 turns)* - answer>>>200 VAC
Which of the following is not a component of a basic electrical circuit? - answer>>>Insulator
What is the thin insulator placed between the plates of a capacitor called? - answer>>>Dielectric
One of the effects a capacitor has in a DC circuit is that it will __________. - answer>>>Charge to a voltage equal to the source voltage
Capacitance is measured in __________. - answer>>>Farads
What is a drawing showing electrical symbols and paths? - answer>>>Schematic
Current in a(n) __________ circuit is divided among the branches of the circuit. - answer>>>Parallel
Which of the following is not a component of a transformer? - answer>>>Plate
What input device is shown in the circuit - answer>>>Left to right cell, switch, lamp, cable Single Pole Single Throw Switch
A circuit that uses resistors to produce a voltage that is lower than the source voltage is called a __________. - answer>>>Voltage divider
What change occurs in a circuit powered by a battery when a parallel branch is added?* Voltage decreases Current decreases Current increases Voltage increases - answer>>>Current increases
Which of the following statements is not true about measuring the resistance of a component that is connected in a circuit?* Connect the leads across the component. Turn off the power supply. Disconnect one of the component leads from the circuit. Make sure the power supply is on. - answer>>>Make sure the power supply is on.
What is the total capacitance of three 25 microfarad capacitors in series?* 75 microfarads 25 microfarads 5 microfarads 8 microfarads - answer>>>8 microfarads
What feature of a ground circuit creates a safe path for current?* Provides a current return to source
Low resistance to ground High resistance to ground Creates an open circuit - answer>>>Low resistance to ground
In order to calculate the output voltage of a transformer, divide the input voltage by the __________.* Turns ratio Resistance Input current Frequency - answer>>>Turns ratio
What is the below symbol? - answer>>>Coil
In the circuit shown, if the negative side of the battery is the common lead. which point has the highest potential voltage? - answer>>>1, r2, 2, r1, 3 is 1
Which of the following is a method to troubleshoot a transformer? - answer>>>Measuring the continuity of the coils
How many seconds will it take for a capacitor in a RC circuit to completely charge if the the RC circuit has a time constant of .05 seconds? - answer>>>0.