Most AC voltmeters are calibrated to indicate __________. A. peak-to-peak voltage B. root-mean-square voltage C. average voltage D. peak voltage only

Most AC voltmeters are calibrated to indicate __________. A. peak-to-peak voltage B. root-mean-square voltage C. average voltage D. peak voltage only
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Answer: B
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Ammeters and voltmeters used in sinusoidal AC power systems indicate which of the following values of the waveforms measured? A. Peak value B. Root-mean-square value C. Average value D. Maximum value

Description : Ammeters and voltmeters used in sinusoidal AC power systems indicate which of the following values of the waveforms measured? A. Peak value B. Root-mean-square value C. Average value D. Maximum value

Last Answer : Answer: B

AC voltmeters are generally calibrated to read the ________. A. instantaneous voltage B. average voltage C. RMS voltage D. peak voltage

Description : AC voltmeters are generally calibrated to read the ________. A. instantaneous voltage B. average voltage C. RMS voltage D. peak voltage

Last Answer : Answer: C

When using a multimeter for resistance measurements, it should be calibrated by clipping the loose ends of the leads together and _____________. A. setting the instrument pointer at 'zero' ohms B. adjusting the line voltage to calibrate the instrument C. plugging each end of one test lead into the plus and minus terminals D. using a special purpose resistance measuring instrument (a bridge)

Description : When using a multimeter for resistance measurements, it should be calibrated by clipping the loose ends of the leads together and _____________. A. setting the instrument pointer at 'zero' ohms B. ... the plus and minus terminals D. using a special purpose resistance measuring instrument (a bridge)

Last Answer : Answer: A

When troubleshooting a lead-acid storage battery, a weak or dead cell is best detected by _________________. A. measuring and comparing all cells' specific gravity B. taking an open circuit voltage test of individual cells C. visually inspecting the electrolyte levels of each cell D. taking each cell's temperature with a calibrated mercury thermometer

Description : When troubleshooting a lead-acid storage battery, a weak or dead cell is best detected by _________________. A. measuring and comparing all cells' specific gravity B. taking an open circuit ... electrolyte levels of each cell D. taking each cell's temperature with a calibrated mercury thermometer

Last Answer : Answer: A

Most AC voltmeters have an rms scale which is valid only if the input signal being measured is a __ signal.

Description : Most AC voltmeters have an rms scale which is valid only if the input signal being measured is a __ signal.

Last Answer : sinusoidal

When voltage and current developed in an AC circuit reach their peak values at the same time, the power factor is _____________. A. lagging B. leading C. maximum D. minimum

Description : When voltage and current developed in an AC circuit reach their peak values at the same time, the power factor is _____________. A. lagging B. leading C. maximum D. minimum

Last Answer : Answer: C

When the voltage and the current developed in an AC circuit reach their peak values at the same time, the power factor is considered to be _____________. A. lagging B. leading C. unity D. infinity

Description : When the voltage and the current developed in an AC circuit reach their peak values at the same time, the power factor is considered to be _____________. A. lagging B. leading C. unity D. infinity

Last Answer : Answer: C

Can I use eurometer calibrated in RMS to measure HWDC in peak?

Description : Can I use eurometer calibrated in RMS to measure HWDC in peak?

Last Answer : No

If digital DRT is calibrated for 300 mm longitudinal wave using 00 double crystal probe then 60kg rail ---------peak will appear at (i) 5.2 (ii) 5.7* (iii) 7.8 (iv) 8.6

Description : If digital DRT is calibrated for 300 mm longitudinal wave using 00 double crystal probe then 60kg rail ---------peak will appear at (i) 5.2 (ii) 5.7* (iii) 7.8 (iv) 8.6

Last Answer : ii) 5.7*

In our houses we get 220 V AC. The value 220 represents (a) constant voltage (b) effective voltage (c) average voltage (d) peak voltage

Description : In our houses we get 220 V AC. The value 220 represents (a) constant voltage (b) effective voltage (c) average voltage (d) peak voltage

Last Answer : Ans:(b)

The voltage at any point in an ac circuit will be a) Peak voltage b) RMS voltage c) Average voltage d) Source voltage

Description : The voltage at any point in an ac circuit will be a) Peak voltage b) RMS voltage c) Average voltage d) Source voltage

Last Answer : b) RMS voltage

Which of the following procedures should be used to determine the load of a threephase, delta wound, AC generator? A. Multiply the amperage in one phase by three. B. Divide the total amperage in all phases by three. C. Multiply the amperage in one phase by the square root of three. D. Divide the total amperage in all phases by the square root of three.

Description : Which of the following procedures should be used to determine the load of a threephase, delta wound, AC generator? A. Multiply the amperage in one phase by three. B. Divide the total amperage in all ... square root of three. D. Divide the total amperage in all phases by the square root of three.

Last Answer : Answer: C

In AC circuits, AC meters measure – (1) mean values (2) rms values (3) peak values (4) mean square values

Description : In AC circuits, AC meters measure – (1) mean values (2) rms values (3) peak values (4) mean square values

Last Answer : (2) rms values Explanation: Voltages and currents for AC circuits are generally expressed as rms (root mean square) values. For a sine wave, the relationship between the peak and the rms average is: rms value = 0.707 peak value.

In AC circuits, AC meters measure (1) mean values (2) rms values (3) peak values (4) mean square values

Description : In AC circuits, AC meters measure (1) mean values (2) rms values (3) peak values (4) mean square values

Last Answer : rms values

If the electricity represented by the wave form in 'B' were applied to the left side of the illustrated circuit, the output on the right side would be ____________. EL-0064 A. direct current with the top lead positive with repect to the lower lead B. direct current, half wave rectified with a ripple frequency of 60 hz C. direct current with the top lead negative with repect to the lower lead D. clipped to a value equal to the square root of 3 times the input voltage value

Description : If the electricity represented by the wave form in 'B' were applied to the left side of the illustrated circuit, the output on the right side would be ____________. EL-0064 A. direct current with the ... lower lead D. clipped to a value equal to the square root of 3 times the input voltage value

Last Answer : Answer: C

The most effective method of locating a loose commutator bar in a D.C. motor is by _____________. A. visual inspection B. jiggling each by hand C. sounding each bar with a light weight hammer D. checking with a calibrated torque wrench

Description : The most effective method of locating a loose commutator bar in a D.C. motor is by _____________. A. visual inspection B. jiggling each by hand C. sounding each bar with a light weight hammer D. checking with a calibrated torque wrench

Last Answer : Answer: C

A capacitor discolored due to excessive heat should be _____________. A. calibrated using a capactance wheatstone bridge B. replaced and the reason for the overheating found C. cooled with a spray can of refrigerant approved for this purpose D. resoldered with care taken to insure that the origional cold solder joint is repaired

Description : A capacitor discolored due to excessive heat should be _____________. A. calibrated using a capactance wheatstone bridge B. replaced and the reason for the overheating found C. cooled with a spray ... purpose D. resoldered with care taken to insure that the origional cold solder joint is repaired

Last Answer : Answer: B

A capacitor discolored due to excessive heat should be _____________. A. calibrated B. replaced C. cooled D. soldered

Description : A capacitor discolored due to excessive heat should be _____________. A. calibrated B. replaced C. cooled D. soldered

Last Answer : Answer: B

An AC supply of 230 V is applied to half wave rectifier circuit. A transformer turns ratio is 20 : 1. Find i) Output DC voltage (ii) Peak Inverse Voltage (PIV)

Description : An AC supply of 230 V is applied to half wave rectifier circuit. A transformer turns ratio is 20 : 1. Find i) Output DC voltage (ii) Peak Inverse Voltage (PIV)

Last Answer : Solution:

In the flow of one cycle of single phase AC current past any given point in a circuit, the maximum current peak occurs _____________. A. one time B. two times C. three times D. four times

Description : In the flow of one cycle of single phase AC current past any given point in a circuit, the maximum current peak occurs _____________. A. one time B. two times C. three times D. four times

Last Answer : Answer: B

What does the Voltmeter in AC mode show? Is it RMS value or peak value?

Description : What does the Voltmeter in AC mode show? Is it RMS value or peak value?

Last Answer : Multimeter in AC mode shows RMS value of the voltage or current. Also when it is DC mode it will show the RMS value only.

If 450 volts AC were measured across the load as shown in the illustration it would indicate a/an _______________. EL-0083 A. open winding between 'H1' and 'X1' B. properly operating circuit C. open winding between 'X1' and 'X4' D. ground on one side of 'Ep'

Description : If 450 volts AC were measured across the load as shown in the illustration it would indicate a/an _______________. EL-0083 A. open winding between 'H1' and 'X1' B. properly operating circuit C. open winding between 'X1' and 'X4' D. ground on one side of 'Ep'

Last Answer : Answer: C

An AC generator operating in parallel loses its excitation without tripping the circuit breaker. This will __________. A. not affect the faulty generator due to the compensation of the other generators B. cause the slip rings to melt C. cause a low voltage differential to develop between the armature and the bus D. cause high currents to be induced in the field windings

Description : An AC generator operating in parallel loses its excitation without tripping the circuit breaker. This will __________. A. not affect the faulty generator due to the compensation of the other generators B. ... between the armature and the bus D. cause high currents to be induced in the field windings

Last Answer : Answer: D

The power factor of an AC generator operating singularly is determined by the __________. A. connected load B. prime mover speed C. field excitation D. generator's rated voltage

Description : The power factor of an AC generator operating singularly is determined by the __________. A. connected load B. prime mover speed C. field excitation D. generator's rated voltage

Last Answer : Answer: A

Prior to starting an AC generator prime mover, the voltage regulator cutout switch should be placed in the __________. A. manual position B. bus neutral position C. raise voltage position D. transfer position

Description : Prior to starting an AC generator prime mover, the voltage regulator cutout switch should be placed in the __________. A. manual position B. bus neutral position C. raise voltage position D. transfer position

Last Answer : Answer: A

Regarding an AC generator connected to the main electrical bus; as the electric load and power factor vary, a corresponding change is reflected in the generator armature reaction. These changes in armature reaction are compensated for by the __________ A. governor speed droop setting B. voltage regulator C. balance coil D. phase-balance relay

Description : Regarding an AC generator connected to the main electrical bus; as the electric load and power factor vary, a corresponding change is reflected in the generator armature reaction. These changes in ... . governor speed droop setting B. voltage regulator C. balance coil D. phase-balance relay

Last Answer : Answer: B

If a voltage tester is being used to check for defective fuses in the circuit, shown in the illustration, which of the readings will indicate that fuse #2 is open? EL-0062 A. C-B full voltage B. A-D full voltage C. A-D no voltage D. C-B no voltage

Description : If a voltage tester is being used to check for defective fuses in the circuit, shown in the illustration, which of the readings will indicate that fuse #2 is open? EL-0062 A. C-B full voltage B. A-D full voltage C. A-D no voltage D. C-B no voltage

Last Answer : Answer: C

What is the average voltage (Eavg) Output of a full-wave rectifier with an output of 100 volts peak?

Description : What is the average voltage (Eavg) Output of a full-wave rectifier with an output of 100 volts peak?

Last Answer : 63.7 volts.

If the output of a half-wave rectifier is 50-volts peak, what is the average voltage

Description : If the output of a half-wave rectifier is 50-volts peak, what is the average voltage

Last Answer : 15.9 volts.

What is the average voltage (Eavg) output of a full-wave rectifier that has an output of 100 volts peak?

Description : What is the average voltage (Eavg) output of a full-wave rectifier that has an output of 100 volts peak?

Last Answer : 63.6 volts.

Capacitance in an AC circuit will _____________. A. stop current flow once the capacitor is fully charged B. allow current flow in only one direction C. oppose any change in circuit voltage D. rectify the current

Description : Capacitance in an AC circuit will _____________. A. stop current flow once the capacitor is fully charged B. allow current flow in only one direction C. oppose any change in circuit voltage D. rectify the current

Last Answer : Answer: C

When troubleshooting electronic equipment, you should use a high impedance multimeter ________________. A. to prevent excess current flow through the meter that would damage it B. for AC measurements only and a low resistance meter for DC measurements C. whenever a low impedance meter is not available, regardless of the components being tested D. so as not to load down the circuit and obtain erroneous voltage readings

Description : When troubleshooting electronic equipment, you should use a high impedance multimeter ________________. A. to prevent excess current flow through the meter that would damage it B. for AC measurements only ... being tested D. so as not to load down the circuit and obtain erroneous voltage readings

Last Answer : Answer: D

What is the relation between voltage and current in AC circuit containing only capacitance?

Description : What is the relation between voltage and current in AC circuit containing only capacitance?

Last Answer : Current (I) is leading the voltage by 90°. I = V/XC amps. XC = 1/2πfC ohms. P = I * V * cosϕ watts. (Where cosϕ is 90 because current is leading the voltage by 90°. So cosϕ 90° = 0) ∴ P = I * V * 0 = 0 watts.

What is the relation between voltage and current in AC circuit containing only inductance?

Description : What is the relation between voltage and current in AC circuit containing only inductance?

Last Answer : Current (I) is lags behind the voltage by 90°. I = V/XL amps. XL = 2πfL ohms. P = I * V * cosϕ watts. (Where cosϕ is 90 because current lags behind voltage by 90°. So cosϕ 90° = 0) ∴ P = I * V * 0 = 0 watts.

What is the relation between voltage and current in AC circuit containing only resistance?

Description : What is the relation between voltage and current in AC circuit containing only resistance?

Last Answer : Current (I) is in-phase with the voltage. I = V/R amps. P = I * V * cosϕ or I2 R watts. (Where cosϕ is zero because the voltage and current are in-phase. So cosϕ 0° (zero) = 1)

Steady d.c voltage is also known as A. square velocity B. root mean square velocity C. root velocity D. velocity

Description : Steady d.c voltage is also known as A. square velocity B. root mean square velocity C. root velocity D. velocity

Last Answer : root mean square velocity

The ratio of the effective value of the counter EMF in volts, to the effective value of the current in amperes is called _____________. A. impedance factor B. capacitive reactance C. inductive reactance D. root mean square

Description : The ratio of the effective value of the counter EMF in volts, to the effective value of the current in amperes is called _____________. A. impedance factor B. capacitive reactance C. inductive reactance D. root mean square

Last Answer : Answer: C

What is root mean square value (R.M.S)?

Description : What is root mean square value (R.M.S)?

Last Answer : The R.M.S value is also known as effective value or virtual value. The instantaneous value of both the directions will all be squared up and will be added together. Then divide to get the average with the number of ... = 1/√2 = 0.707. ∴ R.M.S value or effective value = 0.707 * Emax or Imax

What does ac voltage controller mean?

Description : What does ac voltage controller mean?

Last Answer : It is device which converts fixed alternating voltage into a variable voltage without change in frequency.

Why ammeters have to be arranged in class and voltmeters in parallel circuit ?

Description : Why ammeters have to be arranged in class and voltmeters in parallel circuit ?

Last Answer : Ammeter must be added to the class because it measures the flow. When added in parallel, the flow will be divided into two parts. As a result, the exact value of the flow cannot be ... because adding voltage will change the voltage difference. But in parallel the voltage difference does not change.

`A, B` and `C` are voltmeters of resistances `R, 1.5R` and `3R` respectively. When some potential difference is applied between `x` and `y` the voltme

Description : `A, B` and `C` are voltmeters of resistances `R, 1.5R` and `3R` respectively. When some potential difference is applied between `x` and `y` the voltme

Last Answer : `A, B` and `C` are voltmeters of resistances `R, 1.5R` and `3R` respectively. When some potential difference is ... )` D. `V_(A)ne V_(B)ne V_(C )`

`A, B` and `C` are voltmeters of resistances `R, 1.5R` and `3R` respectively. When some potential difference is applied between `x` and `y` the voltme

Description : `A, B` and `C` are voltmeters of resistances `R, 1.5R` and `3R` respectively. When some potential difference is applied between `x` and `y` the voltme

Last Answer : `A, B` and `C` are voltmeters of resistances `R, 1.5R` and `3R` respectively. When some potential difference is ... )gtV_(3)` D. `V_(1)gtV_(2)=V_(3)`

What are voltmeters used for?

Description : What are voltmeters used for?

Last Answer : A voltmeter measures the voltage between two points in an electrical current. Voltmeters are commonly used to test the remaining life in a battery.

List the six safety precautions for the use of voltmeters.

Description : List the six safety precautions for the use of voltmeters.

Last Answer : a. Always connect a voltmeter in parallel. b. Always start with the highest range. c. Deenergize and discharge the circuit before connecting or disconnecting the voltmeter. d. ... to measure ac voltage. f. Observe the general safety precautions of electric and electronic devices.

What are the advantages of using two voltmeters in series?

Description : What are the advantages of using two voltmeters in series?

Last Answer : Increased input impedance, greater accuracy, and increased voltage range.

All voltmeters except one of the following are operated by the passage of current

Description : All voltmeters except one of the following are operated by the passage of current

Last Answer : electrostatic

Electrostatic voltmeters are particularly suitable for measuring high voltages because the construction...

Description : Electrostatic voltmeters are particularly suitable for measuring high voltages because the construction is simplified due to

Last Answer : Electrostatic voltmeters are particularly suitable for measuring high voltages because the construction is simplified due to Large electrostatic forces.

Electronic Voltmeters which use rectifiers employ negative feedback. This is done -

Description : Electronic Voltmeters which use rectifiers employ negative feedback. This is done -  a) To increase the overall gain b) To improve stability c) To overcome non -linearity of the diodes d) None of the above

Last Answer : Electronic Voltmeters which use rectifiers employ negative feedback. This is done - To overcome non -linearity of the diodes

Two voltmeters have the same range 0-400V. The internal impedance ...

Description : Two voltmeters have the same range 0-400V. The internal impedance are 30,000 Ohms and 20,000 Ohms. If they are connected in series and 600V be applied across them, the readings are

Last Answer : Two voltmeters have the same range 0-400V. The internal impedance are 30,000 Ohms and 20,000 Ohms. If they are connected in series and 600V be applied across them, the readings are 360V and 240V.