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WorksheetsAC/DC Electrical Circuits 1 part 2
Total questions: 40
Worksheet time: 20mins
Capacitance is measured in _____
A) Farads
B) Henrys
C) Ohms
D). Volts
The energy stored by a capacitor is called a(n) _____
A) Induced voltage
B) Electrostatic charge
C) Voltage spike
D) All of the above
E) None of the above
Which of the following is a type of capacitor
A) Electrolytic
B) Nonpolarized
C) Variable
D) All of the above
E) None of the above
In a DC circuit, capacitors _____
A) Charge to a voltage equal to the source voltage
B) Continue to charge until the source is completely drained
C) Act like a short until it is fully charged
D) None of the above
The apparent resistance to AC by a capacitor is called _____
A) Frequency displacement
B) Capacitive reactance
C) Passive capacitance
D. Filtering
Which of the following is the total series capacitive reactance formula
A) XCT=XC1 x XC2 x XC3...
B) XCT=XC1 - XC2 - XC3...
C) XCT= XC1 + XC2 + XC3...
D) XCT=1/[(1/XC1) + (1/XC2) + (1/XC3)...]
The formula for calculating total parallel capacitance is _____
A) CT = C1 + C2 + C3...
B) (1/CT) = (1/C1) + (1/C2) + (1/C3)
C) CT = C1 x C2 x C3...
D) CT = C1 - C2 - C3...
A common inductor found in fluorescent light fixtures is a _____
A) Starter
B) Cathode
C) Ballast
D) Switcher
A time-delay relay that uses an RC timing circuit is called a(n) _____
A) Solid-state, time-delay relay
B) Adjustable relay
C) Dashpot time-delay relay
D) Motor-driven, time-delay relay
In a power supply that converts an AC input to generate a DC output, a capacitor is commonly used to _____
A) Block the current flow
B) Increase the current flow
C) Filter the rectifier's pulsating DC output
D. Decrease the voltage
A _____ is an electrical device that converts AC electricity from one voltage level to another
A) Transformer
B) Primary coil
C) Secondary coil
D) Center tap
A common application of mutual inductance is found in a device called a _____
A) Buzzer
B) Motor
C) Relay
D) Transformer
Which of the following is not a component of a transformer
A) Plate
B) Secondary
C) Primary
D) Core
A transformer's output voltage can be calculated by _____
A) Comparing the frequency to the inductive reactance
B) Dividing the input voltage by the turns ratio of the primary and secondary
C) Dividing the input voltage by the input current
D) Comparing input and output resistance
Which of the following is a method to troubleshoot a transformer
A) Measuring the current flow
B) Measuring the weight of the transformer
C) Measuring the continuity of the coils
D) All of the above
E) None of the above
What unit is used to rate transformers
A) Amperes
B) Hertz
C) Volt Amperes
D) Ohms
The power relationship on a transformer states that _____
A) Power in = power out + loss
B) Power in = 1/2 power out
C) Power in = 2 x power out
D) All of the above
E) None of the above
The current load of a transformers is the current drawn by the _____
A) Load connected to transformer
B) Secondary with no load connected
C) Load connected to the primary
D) Primary winding itself
A _____ only has one combined primary and secondary coil
A) Distribution transformer
B) Autotransformer
C) Isolation transformer
D) Control transformer
Which type of transformer is commonly used to reduce line voltages of 240 VAC or 480 VAC to 120 VAC
A) Isolation transformer
B) Control transformer
C) Autotransformer
D) Distribution transformer
A common application of a center tap on the secondary of a transformer is a(n) _____
A) Autotransformer
B) Step-up transformer
C) Distribution transformer
D) All of the above
E) None of the above
In a series-parallel circuit, components that are connected in parallel will display characteristics of a(n) _____
A) Series circuit
B) Parallel circuit
C) Open circuit
D) Short circuit
In order to identify the series and parallel sections of a combination circuit, _____
A) Eliminate the parallel section
B) Use a DMM
C) Trace the current path
D) All of the above
E) None of the above
Which of the following is an application of a combination circuit
A) Commercial building's lights
B) Electrical outlets controlled by a switch
C) Ceiling fan control
D) All of the above
E) None of the above
Which of the following is not one of the seven general steps for solving a combination circuit
A) Calculate the equivalent resistance for all parallel section
B) Calculate the total resistance of the circuit
C) Calculate the total current
D) Calculate the RC time constant
A variable resistor is different from a fixed resistor because it _____
A) Doesn't have to be connected in a circuit to work
B) Can be adjusted
C) Can be used only in AC circuits
D) All of the above
E) None of the above
Which of the following is an application of a variable resistor
A) Radio volume controls
B) Television controls
C) Dim lighting
D) All of the above
E) None of the above
A circuit that uses resistors to produce a voltage that is lower than the source voltage is called a _____
A) Step-down transformer
B) Reduction circuit
C) Voltage divider
D) Voltage converter
In order for a firm voltage divider to operate properly, the load resistance valve should be at least _____ times greater than resistance value of the voltage divider bleeder resistor
A) 10
B) 2
C) 5
D) 8
A short circuit in the branch of a paralle; circuit will _____
A) Cause an excessive amount of current to flow
B) Damage or destroy the power supply
C) Cause a short circuit across the power supply
D) All of the above
E) None of the above
Which of the following is not a step for troubleshooting parallel circuit to find a short
A) Disconnect the power supply
B) Look for visible signs of damage
C) Connect an ohmmeter across the main line
D) All of the above
E) None of the above
What is the result when a branch of a parallel circuit has an open
A) It has no effect on the circuit
B) The circuit will not operate
C) The rest of the circuit will operate but with a reduced total current
D) It will cause a short to develop
Which of the following is not an advantage of electronic sensors
A) Higher operating speed
B) Low power handling ability
C) Long operating life
D) No physical contact with object being sensed
Five types of electronic sensors include: inductive, capacitive, photoelectric, Hall-Effect and _____
A) Limit switch
B) Magnetic reed switch
C) PNP transistors
D) None of the above
What does a transistor output do in a sensor
A) Switching
B) Sensing
C) Amplifying
D) None of the above
What type of transistor has a high output signal when a sensor is activated
A) NPN
B) PNP
C) NDP
D) PDP
An inductive proximity sensor uses _____ to sense the presence of an object
A) Reflected light
B) An electrostatic field
C) Magnetic field/oscillator
D) Ferromagnetic contacts
_____ targets are the only targets that can be dected by an inductive proxminty sensor
A) Nonmetallic
B) Metallic
C) Wood
D) None of the above
A capacitive sensor uses _____ to sense the presence of an object
A) Reflected light
B) An electrostatic field
C) Magnetic field/oscillator
D) Ferromagnetic contacts
Capacitive sensors can detect _____ objects with a higher dielectric constant at a greater distance that those with a small dielectric
A) Nonmetallic
B) Metallic
C) Ferrometallic
D) Parametallic
