Description : In AC circuits, AC meters measure (1) mean values (2) rms values (3) peak values (4) mean square values
Last Answer : rms values
Description : In AC circuits, AC meters measure?
Last Answer : RMS values
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
Description : External noise fields are measured in terms of _______. A. rms values B. dc values C. average values D. peak values
Last Answer : D. peak values
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
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.
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
Description : Can I use eurometer calibrated in RMS to measure HWDC in peak?
Last Answer : No
Description : One of the following is a possible cause of an abrupt frequency variation in a self exited transmitter oscillator circuits resulting to a poor frequency stability to hold a constant frequency ... capacitor in the oscillator D. Loose connections in the oscillator, amplifier, or antenna circuits.
Last Answer : D. Loose connections in the oscillator, amplifier, or antenna circuits.
Description : The instantaneous power in ac circuits can be obtained by taking product of the instantaneous values of
Last Answer : The instantaneous power in ac circuits can be obtained by taking product of the instantaneous values of current and voltage
Description : Most AC voltmeters are calibrated to indicate __________. A. peak-to-peak voltage B. root-mean-square voltage C. average voltage D. peak voltage only
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
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
Description : Define following terms used in A.C. circuits : (i) Cycle (ii) Rms value (iii) Phase difference (iv) Average value
Last Answer : (i) Cycle: A complete set of variation of an alternating quantity which is repeated at regular interval of time is called as a cycle. OR Each repetition of an alternating quantity ... charge as is transferred by the alternating current during the same time under the same conditions.
Description : Alternating current measured in a transmission line will be a) Peak value b) Average value c) RMS value d) Zero
Last Answer : c) RMS value
Description : If the peak value of a sine wave is 30 V, the rms value is? A.19.08 V B.7.07 V C.0.707 V D.23.10 V
Last Answer : If the peak value of a sine wave is 30 V, the rms value is? A.19.08 V B.7.07 V C.0.707 V D.23.10 V
Description : If the rms voltage drop across a 15 kilt resistor is 16 V, the peak current through the resistor is : - a) 15 mA b) 1.5 mA c) 10 mA d) 1 mA
Last Answer : If the rms voltage drop across a 15 kilt resistor is 16 V, the peak current through the resistor is : - 1.5 mA
Description : Why would i use square meters to measure a floor tile?
Last Answer : Need answer
Description : Highest point on AC graph is known as A. peak value B. amplitude C. frequency D. wave front
Last Answer : peak value
Description : I've been asked to find the temperature to which a 20.0°C gas must be raised to increase its root mean square (rms) speed by a given percentage. Is this possible without knowing the identity of the gas?
Last Answer : Pretend the gas is hydrogen. Work out the problem. Pretend the gas is oxygen. Work out the problem. Are the answers you get any different?
Description : Most AC voltmeters have an rms scale which is valid only if the input signal being measured is a __ signal.
Last Answer : sinusoidal
Description : In a half wave rectifier the rms value of AC component of the waves (a) Zero (b) Equal to DC value (c) More than DC value (d) Less than DC value
Last Answer : b) Equal to DC value
Description : Define RMS value and Average value of AC waveform.
Last Answer : 1. RMS value:- For an alternating current, the RMS value is defined as that value of steady current (DC) which produces the same heat or power as is produced by the alternating current during the ... by averaging all the instantaneous values of its wave over a period of half cycle. Iav=0.637 Imax
Description : Define : i) Maximum Value ii) RMS Value of ac supply
Last Answer : i) Maximum Value :- The maximum or peak value attained by an alternating quantity during positive or negative half cycle, is called maximum value or peak value. ii) RMS Value of ac ... as produced by the alternating current when flowing through the same resistance and for the same time.
Description : Define : i) Average value ii) RMS value of an AC Wave.
Last Answer : i) Average value: The average value is defined as the average of all instantaneous values during one alternation . That is, the ratio of the sum of all considered instantaneous values to the ... as produced by the alternating current when flowing through the same resistance for the same time.
Description : Explain in brief AC Current , RMS Indication using Hall Effect Transducer.
Last Answer : When an ac current passes through the conductor it sets up a magnetic field around the conductor. This magnetic field is proportional to the current. A Hall Effect Transducer is placed in a ... flowing in the conductor. In this way, the current is measured using the Hall effect transducer.
Description : Two series resistors are connected to an ac source. If there are 7.5 V rms across one resistor and 4.2 V rms across the other, the peak source voltage is? A.16.54 V B.1.65 V C.10.60 V D.5.93 V
Last Answer : Two series resistors are connected to an ac source. If there are 7.5 V rms across one resistor and 4.2 V rms across the other, the peak source voltage is? A.16.54 V B.1.65 V C.10.60 V D.5.93 V
Description : A single-phase ac voltage source has 200 V rms and a system connected consumes an active power of 300 W. What is the reactive power consumed by the system if 2.5 A rms current is drawn ? (a) 100 VAR (b) 200 VAR (c) 300 VAR (d) 400 VAR
Last Answer : A single-phase ac voltage source has 200 V rms and a system connected consumes an active power of 300 W. What is the reactive power consumed by the system if 2.5 A rms current is drawn ? 400 VAR
Description : If the Kelvin temperature of an ideal gas is doubled, what happens to the rms speed of the molecules in the gas? a. it increases by a factor of square root of 2 b. it increases by a factor of 2 c. it increases by factor of 4 d. none of the above
Last Answer : it increases by a factor of square root of 2
Description : In a simple dc circuit, voltage equals resistance multiplied by current. This is also considered true in an AC circuit if the what values of the current and voltage are used.
Last Answer : ANSWER: ROOT MEAN SQUARE (RMS) VALUES
Description : Does anyone have experience with peak flow meters? I have some questions about what's considered "normal". (read on) questions about?
Last Answer : answer:I hope this helps you out. I know nothing but your issue but I looked around for a hopefully helpful link. Best of luck! Ruth http://www.lungusa.org/lung-disease/asthma/living-with-asthma/take-control-of-your-asthma/measuring-your-peak-flow-rate.html
Description : Which of the following is one of the possible causes for a slow drift of frequency in a self exited transmitter oscillator circuits resulting to a poor frequency stability? A. Poor soldered connections ... , or antenna circuits D. DC and RF heating of resistors, causing then to change values.
Last Answer : D. DC and RF heating of resistors, causing then to change values.
Description : Which of the following statements concerning AC circuits is correct? A. The power factor of a resistive circuit is always zero. B. True power in an inductive circuit always equals apparent power. ... . D. Total opposition to the flow of alternating current depends upon the amount of reactive power.
Description : Transformers are used onboard ships with AC generators to _____________. A. change frequency B. increase power output to modulating frequency controllers C. decrease power output to modulating frequency ... D. permit higher voltage for electric motor operation and low voltage for lighting circuits
Last Answer : Answer: D
Description : AC circuits develop resistance, inductance, and capacitance. The inductive reactance of a circuit is expressed in _____________. A. ohms B. mhos C. henrys D. farads
Last Answer : Answer: A
Description : AC circuits possess characteristics of resistance, inductance, and capacitance. The capacitive reactance of a circuit is expressed in _____________. A. ohms B. mhos C. henrys D. farads
Description : Explain the terms real power, apparent power and reactive power for ac circuits and also the units used.
Last Answer : Real Power: It is the product of voltage, current and power factor i.e. P = V I cos j and basic unit of real power is watt. i.e. Expressed as W or kW. Apparent power: It is the product of ... X current X sinj or Reactive power = V I sin j and has no other unit but expressed in VAR or KVAR.
Description : State different types of power in ac circuits. Write the expression and units for the same. Draw the power triangle.
Last Answer : i) Active Power (P):- The active power is defined as the average power Pavg taken by or consumed by the given circuit. ii) Reactive Power (Q):- The reactive power is defined as the product of ... values of voltage (v) and current (I) it is given by iv) Power Triangle:
Description : AC Circuits with Resistance but No Reactance
Last Answer : AC Circuits with Resistance but No Reactance AC Circuits with Resistance but No Reactance Series resistances let two resistances R 1 and R 2 are connected in series as shows in figure and there ... voltage. Voltage V A is common to both the branch hence voltage V A is common reference.
Description : What is the need of polarity marking in polyphase AC circuits?
Last Answer : Need of Polarity Marking in Polyphase AC Circuits: i) Polarity marking of terminals provides reference polarity for better understanding of system, even if the polarity of ac voltage changes ... of current transformers in relay protection circuit and getting desired performance is very difficult.
Description : Compare AC & DC track circuits on i) Length of circuit ii) Application iii) Effect of stray currents. iv) Maintenance
Last Answer : Ans: i) Length of circuit - a) AC track circuit is having long length upto 3 to 5 km b) DC track circuit is having short length ii)Application -a) AC track circuit is used ... ) Maintenance - a) AC track circuit has easier and cheaper maintenance b) DC track circuit has complicated maintenance
Description : Wagner's earth devices are used in AC bridge circuits for (a) Eliminating the effect of earth capacitances (b) Eliminating the effect of intercomponent capacitances (c) Eliminating the effect of stray electrostatic fields (d) Shielding the bridge elements
Last Answer : Wagner's earth devices are used in AC bridge circuits for Eliminating the effect of earth capacitances
Description : In AC. circuits, laminated iron is invariably used in order to?
Last Answer : In AC. circuits, laminated iron is invariably used in order to reduce eddy current loss.
Description : does ohm's law apply to ac circuits?
Last Answer : Yes it does, but as it is supplied with ac we will have to take impedance in account.
Description : For spark ignition engine, the equivalence ratio of mixture entering the combustion chamber has values (A) for idling and for peak power conditions (B) for both idling and peak power conditions (C) for idling and for peak power conditions (D) for both idling and peak power conditions
Last Answer : ANSWER (B) for both idling and peak power conditions
Description : The ________ is a function of three values: average data rate, peak data rate, and maximum burst size.
Last Answer : Effective bandwidth
Description : In comparison to jump clutchs, advantages of the friction safety clutches is/are a) More consistent break away torque b) No damageing peak during slippage c) Protecting a drive from high freuency peak torque (2-3 time normal values) d) All of the above
Last Answer : d) All of the above
Description : Which one of the following statements about the mass spectrum of CH3Br is correct? a. the last two peaks are of equal size and occur at m/z values of 94 and 96 b. the last two peaks have abundances in the ... m/z value of 95 d. there is just one peak for the molecular ion with an m/z value of 44
Last Answer : a. the last two peaks are of equal size and occur at m/z values of 94 and 96
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)
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