Electrical Engineering

When controlling the direction of a dc motor, which winding(s) have their polarity reversed?

When controlling the direction of a dc motor, which winding(s) have their polarity reversed?

When controlling the direction of a dc motor, which winding(s) have their polarity reversed?
 
  A) both the stator and the armature B) either the stator or the armature
  C) only the stator D) only the armature

yxc47   57   1 Reply

return127

A sine wave's frequency equals the reciprocal of its period. (True or false?)

A sine wave's frequency equals the reciprocal of its period. (True or false?)

A sine wave's frequency equals the reciprocal of its period.
 
  Indicate whether the statement is true or false

gi.x3   90   1 Reply

Gax_52912

Current flows both ways simultaneously in an AC circuit (True or false?)

Current flows both ways simultaneously in an AC circuit (True or false?)

Current flows both ways simultaneously in an AC circuit.
 
  Indicate whether the statement is true or false

sopmit   71   1 Reply

busfuohrugf

Only frequency increases with the speed of an AC generator (True or false?)

Only frequency increases with the speed of an AC generator (True or false?)

Only frequency increases with the speed of an AC generator.
 
  Indicate whether the statement is true or false

sunil1285   67   1 Reply

leg17

20 Vrms of alternating current will illuminate a given lamp at the same intensity as 20 V of direct ...

20 Vrms of alternating current will illuminate a given lamp at the same intensity as 20 V of direct ...

20 Vrms of alternating current will illuminate a given lamp at the same intensity as 20 V of direct current.
 
  Indicate whether the statement is true or false

yxc47   29   1 Reply

Sauleha

Kirchhoff's voltage law can be used with resistive ac circuits. (True or false?)

Kirchhoff's voltage law can be used with resistive ac circuits. (True or false?)

Kirchhoff's voltage law can be used with resistive ac circuits.
 
  Indicate whether the statement is true or false

cattyson   50   1 Reply

icysparkles

Single-phase power cannot be converted to three-phase power. (True or false?)

Single-phase power cannot be converted to three-phase power. (True or false?)

Single-phase power cannot be converted to three-phase power.
 
  Indicate whether the statement is true or false

nurse12   51   1 Reply

ecarvallo1

The RMS value of a sine wave means ________.

The RMS value of a sine wave means ________.

The RMS value of a sine wave means ________.
 
  A) the root mean square value
  B) the same as IP  R
  C) the same as IPP  R
  D) the heating effect of an ac generator of the same voltage

Mroche   119   2 Replies

Mroche

If a rectangular wave's pulse width is 50 S and its frequency is 4 kHz, its duty cycle is ________. ...

If a rectangular wave's pulse width is 50 S and its frequency is 4 kHz, its duty cycle is ________. ...

If a rectangular wave's pulse width is 50 S and its frequency is 4 kHz, its duty cycle is ________.
 
  A) 98.75 B) 20 C) 80 D) 1.25

luciaf99   69   1 Reply

karlyphilpott

The time required by a 10 V square wave to change from 1 V to 9 V is known as the ________.

The time required by a 10 V square wave to change from 1 V to 9 V is known as the ________.

The time required by a 10 V square wave to change from 1 V to 9 V is known as the ________.
 
  A) rise time B) fall time C) period D) pulse width

Brapbrap   24   1 Reply

srw23557

What is the approximate instantaneous voltage at 37 on a 169 VP sine wave?

What is the approximate instantaneous voltage at 37 on a 169 VP sine wave?

What is the approximate instantaneous voltage at 37 on a 169 VP sine wave?
 
  A) 102 V B) 135 V C) 239 V D) 119 V

potato55   284   1 Reply

Wilkinson

A 12 VP sine wave equals ________.

A 12 VP sine wave equals ________.

A 12 VP sine wave equals ________.
 
  A) 24 VPP B) 7.64 VAVG C) 8.48 VRMS D) all of these

merandaae19   127   2 Replies

merandaae19

An oscilloscope's seconds/division switch is set on 20 s/cm. If the trace is 7.5 cm long, what is ...

An oscilloscope's seconds/division switch is set on 20 s/cm. If the trace is 7.5 cm long, what is ...

An oscilloscope's seconds/division switch is set on 20 s/cm. If the trace is 7.5 cm long, what is the period?
 
  A) 0.0015 s B) 1.5 s C) 5 s D) 150 s

lexilourdes   46   1 Reply

Amc3010

If the period of a square wave is 22 ms, what is its frequency?

If the period of a square wave is 22 ms, what is its frequency?

If the period of a square wave is 22 ms, what is its frequency?
 
  A) 22 kHz B) 45.5 kHz C) 45.5 Hz D) 22 Hz

hboydston   249   1 Reply

yilongchang

The symbol for the period of a wave form is:

The symbol for the period of a wave form is:

The symbol for the period of a wave form is:
 
  A) F. B) W. C) P. D) T.

Wutwut12   26   1 Reply

asapchigga

The period of most AC waveforms is measured in units of:

The period of most AC waveforms is measured in units of:

The period of most AC waveforms is measured in units of:
 
  A) cycles. B) seconds. C) alternations. D) revolutions.

sopmit   68   1 Reply

ebwilliams25

The AC sine wave varies from zero to its maximum value in accordance with:

The AC sine wave varies from zero to its maximum value in accordance with:

The AC sine wave varies from zero to its maximum value in accordance with:
 
  A) a mathematical formula. B) a geometric progression.
  C) an algebraic function. D) a trigonometric relationship.

Johnni   45   1 Reply

skalass

A square wave is a unique form of the rectangular pulse wave in that:

A square wave is a unique form of the rectangular pulse wave in that:

A square wave is a unique form of the rectangular pulse wave in that:
 
  A) the positive and negative halves are equal. B) the duty cycle is 50.
  C) the wave is symmetrical. D) all of these

Mroche   74   1 Reply

Ashleyroshell

The average value of a rectangular pulse wave is calculated as:

The average value of a rectangular pulse wave is calculated as:

The average value of a rectangular pulse wave is calculated as:
 
  A) Vavg = 0.637 Vp. B) Vavg = Vbaseline + (duty cycle)  Vp.
  C) Vavg = 1.57 Vp. D) Vavg = Vbaseline + Vp.

yxc47   61   1 Reply

Sauleha

The value of a AC sine wave at any instant can be represented by:

The value of a AC sine wave at any instant can be represented by:

The value of a AC sine wave at any instant can be represented by:
 
  A) a graph of the voltage or current vs. the angular measurement.
  B) the formula Vi = Vp  sin .
  C) a phasor whose angle and magnit

Johnni   180   2 Replies

Johnni

The square wave is made up of:

The square wave is made up of:

The square wave is made up of:
 
  A) the fundamental frequency and all the odd harmonics.
  B) the fundamental frequency and all the even harmonics.
  C) the fundamental frequency and both the odd and even ha

merandaae19   89   1 Reply

chicken

The largest numerical value in the measurement of alternating current is:

The largest numerical value in the measurement of alternating current is:

The largest numerical value in the measurement of alternating current is:
 
  A) rms. B) peak. C) peak to peak. D) average.

jessiecraane   96   1 Reply

DJF101814

Troubleshooting an AC circuit can be performed with which of the following tools?

Troubleshooting an AC circuit can be performed with which of the following tools?

Troubleshooting an AC circuit can be performed with which of the following tools?
 
  A) digital multimeter B) oscilloscope C) analog voltmeter D) any of the above

sopmit   272   1 Reply

Wilkinson

Superimposing an AC voltage of 3.54 Vrms with a DC source of 10 V results in a waveform that:

Superimposing an AC voltage of 3.54 Vrms with a DC source of 10 V results in a waveform that:

Superimposing an AC voltage of 3.54 Vrms with a DC source of 10 V results in a waveform that:
 
  A) peaks at 20 V. B) peaks at 13.54 V. C) peaks at 15 V. D) both B and C

cattyson   81   1 Reply

joanneanna

While troubleshooting a circuit the voltage seems to be zero; what if any adjustment should be ...

While troubleshooting a circuit the voltage seems to be zero; what if any adjustment should be ...

While troubleshooting a circuit the voltage seems to be zero; what if any adjustment should be checked on the oscilloscope?
 
  A) focus setting B) AC/GND/DC switch
  C) time division setting D) trigger level

SapphireSmoke   97   1 Reply

premed9

What type of sensor is used by a clamp meter to measure dc current?

What type of sensor is used by a clamp meter to measure dc current?

What type of sensor is used by a clamp meter to measure dc current?
 
  A) inverter B) inductive C) transformer action D) Hall-effect

SapphireSmoke   52   1 Reply

Helverson28

Spectrum analyzers : (Multiple Choice)

Spectrum analyzers : (Multiple Choice)

Spectrum analyzers
 
  A) display the sinusoidal components of a waveform
  B) are used primarily in RF and microwave applications
  C) are frequency-domain devices
  D) all of the above

potato55   78   1 Reply

Avi cardinals

Traditionally, radio frequency signal generators operate in the range of :

Traditionally, radio frequency signal generators operate in the range of :

Traditionally, radio frequency signal generators operate in the range of
 
  A) 100 kHz to 5 GHz B) 10 kHz to 1 GHz C) 500 kHz to 5 GHz D) 100 kHz to 1 GHz

potato55   41   2 Replies

potato55

If you want to test a system for its frequency response you would probably employ a(n) :

If you want to test a system for its frequency response you would probably employ a(n) :

If you want to test a system for its frequency response you would probably employ a(n)
 
  A) swept-frequency oscillator B) custom-pattern generator
  C) multifunction signal generator D) arbitrary function generator

jkidane1829393   27   1 Reply

tysonras

When two capacitors are connected in parallel across a dc source, the smaller capacitor drops the ...

When two capacitors are connected in parallel across a dc source, the smaller capacitor drops the ...

When two capacitors are connected in parallel across a dc source, the smaller capacitor drops the larger voltage.
 
  Indicate whether the statement is true or false

sopmit   57   1 Reply

Icgcyvfiifctcit

The voltage rating of a capacitor indicates the voltage it will charge up to. (True or false?)

The voltage rating of a capacitor indicates the voltage it will charge up to. (True or false?)

The voltage rating of a capacitor indicates the voltage it will charge up to.
 
  Indicate whether the statement is true or false

jaypatel432   75   1 Reply

premed9

What is the capacitance of a capacitor that drops 50 V and stores 0.500 C of charge?

What is the capacitance of a capacitor that drops 50 V and stores 0.500 C of charge?

What is the capacitance of a capacitor that drops 50 V and stores 0.500 C of charge?
 
  A) 0.001 F B) 0.01 F C) 1 F D) 0.1 F

Zoeyismycat   205   1 Reply

Xuantunich

If a 4.7 F capacitor operates at 10 kHz, XC equals ________.

If a 4.7 F capacitor operates at 10 kHz, XC equals ________.

If a 4.7 F capacitor operates at 10 kHz, XC equals ________.
 
  A) 339  B) 3.39  C) 294  D) infinite

lexilourdes   40   1 Reply

ebwilliams25

How much charge is stored in a 0.022 F capacitor that drops 22 V?

How much charge is stored in a 0.022 F capacitor that drops 22 V?

How much charge is stored in a 0.022 F capacitor that drops 22 V?
 
  A) 0.0484 C B) 48.4 C C) 0.484 C D) 4.84 C

meganchambers8   27   1 Reply

tkelems2012

If the dc working voltage of a capacitor is 100 V, the dielectric must withstand ________.

If the dc working voltage of a capacitor is 100 V, the dielectric must withstand ________.

If the dc working voltage of a capacitor is 100 V, the dielectric must withstand ________.
 
  A) 100 VDC B) 75 VRMS C) 85 VRMS D) 220 VPP

luciaf99   35   2 Replies

luciaf99

If a 0.05 F and 0.1 F capacitor are connected in parallel across a 20 V source, the total ...

If a 0.05 F and 0.1 F capacitor are connected in parallel across a 20 V source, the total ...

If a 0.05 F and 0.1 F capacitor are connected in parallel across a 20 V source, the total capacitance equals ________ and each capacitor drops ________.
 
  A) 0.15 F, 20 V B) 0.05 F, 15 V C) 0.10 F, 20 V D) 0.15 F, 10 V

ibukunsulie85   59   1 Reply

lconard0726

If a 0.022 F, 0.022 F and 0.05 F capacitor are connected in series across a 25 V source, the voltage ...

If a 0.022 F, 0.022 F and 0.05 F capacitor are connected in series across a 25 V source, the voltage ...

If a 0.022 F, 0.022 F and 0.05 F capacitor are connected in series across a 25 V source, the voltage drop across the largest capacitor equals ________.
 
  A) 11.8 V B) 4.51 V C) 17.5 V D) 10.2 V

yxc47   53   1 Reply

ebwilliams25

What is one time constant of a 4.7 F capacitor in series with a 22 k resistor?

What is one time constant of a 4.7 F capacitor in series with a 22 k resistor?

What is one time constant of a 4.7 F capacitor in series with a 22 k resistor?
 
  A) 103 ms B) 10.3 ms C) 0.103 ms D) 1.03 ms

lexilourdes   48   1 Reply

srw23557

How long will it take a 0.047 F capacitor to fully charge through a 100 k resistor?

How long will it take a 0.047 F capacitor to fully charge through a 100 k resistor?

How long will it take a 0.047 F capacitor to fully charge through a 100 k resistor?
 
  A) 0.235 ms B) 23.5 ms C) 235 ms D) 2.35 s

Coco   35   1 Reply

ecarvallo1

How long will it take a 1 F capacitor to completely discharge through a 47 k resistor?

How long will it take a 1 F capacitor to completely discharge through a 47 k resistor?

How long will it take a 1 F capacitor to completely discharge through a 47 k resistor?
 
  A) 47 s B) 235 ms C) 235 s D) 47 ms

applegatedogs   27   1 Reply

mikeman2332