What is the unit of measurement of reactive power?

What is the unit of measurement of reactive power?
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1 Answer

Answer :

var.
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Related questions

What is the unit of measurement of apparent power?

Description : What is the unit of measurement of apparent power?

Last Answer : Apparent power

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Last Answer : var.

Draw the circuit diagram for:- i) Measurement of active power in 3-phase load circuit using two wattmeter. ii) Measurement of reactive power in 3-phase load circuit using one wattmeter.

Description : Draw the circuit diagram for:- i) Measurement of active power in 3-phase load circuit using two wattmeter. ii) Measurement of reactive power in 3-phase load circuit using one wattmeter.

Last Answer : (i) Measurement of active power in 3- phase load circuit using two- wattmeter: (ii) Measurement of reactive power in 3- phase load circuit using one wattmeter

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Description : List any two methods of reactive power measurement in 3 phase circuit.

Last Answer : Methods of reactive power measurement in 3 phase circuit: (i) Two single phase wattmeter method (ii) One single phase wattmeter method

What is the formula for calculating reactive power?

Description : What is the formula for calculating reactive power?

Last Answer : Reactive Power = (IX)2X

What is the reactive power in an ac circuit?

Description : What is the reactive power in an ac circuit?

Last Answer : Reactive power is the power returned to the source by the reactive components of the circuit.

What unit of measurement refers to the torque of a synchro transmitter

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Description : When is an optical power meter measurement recommended for conducting field measurements on installed optical fiber cables or cable plants?

Last Answer : When an installed optical fiber cable or cable plant is less than 50 meters in length.

When taking a voltage measurement, which lead of the voltmeter should you connect to the circuit first?

Description : When taking a voltage measurement, which lead of the voltmeter should you connect to the circuit first?

Last Answer : Ground.

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Last Answer : Highest.

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A transmission line is said to have distributed constants of inductance, capacitance, and resistance along the line. What units of measurement are used to express these constants?

Description : A transmission line is said to have distributed constants of inductance, capacitance, and resistance along the line. What units of measurement are used to express these constants?

Last Answer : Inductance is expressed in micro henrys per unit length, capacitance is expressed in picofarads per unit length, and resistance is expressed in ohms per unit length.

When using an American Standard Wire Gauge to determine the size of a wire, where should you place the wire in the gauge to get the correct measurement?

Description : When using an American Standard Wire Gauge to determine the size of a wire, where should you place the wire in the gauge to get the correct measurement?

Last Answer : In the parallel walled slot not the circular area.

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Description : What other measurement can an ohmmeter make?

Last Answer : Circuit continuity.

What range of an ammeter is selected for the final measurement?

Description : What range of an ammeter is selected for the final measurement?

Last Answer : A range that allows a meter reading near the center of the scale.

Why should you use the highest range of an ammeter for the initial measurement?

Description : Why should you use the highest range of an ammeter for the initial measurement?

Last Answer : To prevent damage to the meter movement from excessive current.

What are two ways that circuit measurement is used?

Description : What are two ways that circuit measurement is used?

Last Answer : Circuit measurement is used to (1) monitor the operation of a piece of electrical or electronic equipment and (2) determine the reason a piece of electrical or electronic equipment is not functioning properly.

Far-field power distributions describe the emitted power per unit area as a function of angle θ in the far-field region. Describe the far-field region.

Description : Far-field power distributions describe the emitted power per unit area as a function of angle θ in the far-field region. Describe the far-field region.

Last Answer : The far-field region is the region far from the fiber-end face.

Near-field power distributions describe the emitted power per unit area in the near-field region. Describe the near-field region

Description : Near-field power distributions describe the emitted power per unit area in the near-field region. Describe the near-field region

Last Answer : The near-field region is the region close to the fiber-end face.

What is Reactive Power ?

Description : What is Reactive Power ?

Last Answer : The product of the voltage of the AC circuit and the product of the reactive current or the vertical component of the current is called reactive power.

As shown in the illustration, the function of the switch labeled 'PFSW' is to determine the ______________. EL-0003 A. bus frequency B. reactive volt amperes of the bus C. frequency of either generator D. power factor of either generator

Description : As shown in the illustration, the function of the switch labeled 'PFSW' is to determine the ______________. EL-0003 A. bus frequency B. reactive volt amperes of the bus C. frequency of either generator D. power factor of either generator

Last Answer : Answer: D

The energy consumed by an AC motor, as strictly reactive power, is _____________. A. used to do mechanical work B. used to establish the magnetic field of the motor C. lost as heat generated by the windings D. lost in doing work to turn the motor itself

Description : The energy consumed by an AC motor, as strictly reactive power, is _____________. A. used to do mechanical work B. used to establish the magnetic field of the motor C. lost as heat generated by the windings D. lost in doing work to turn the motor itself

Last Answer : Answer: B

The reactive power drawn by a motor from an AC generator is the power which is _____________. A. used to establish the magnetic field of the motor B. lost in overcoming friction in the bearings C. strictly converted to heat generated by current flow through the windings D. transmitted directly through the rotor shaft to perform useful work

Description : The reactive power drawn by a motor from an AC generator is the power which is _____________. A. used to establish the magnetic field of the motor B. lost in overcoming friction in the ... by current flow through the windings D. transmitted directly through the rotor shaft to perform useful work

Last Answer : Answer: A

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. C. Inductive reactance varies directly with the frequency and the inductance. D. Total opposition to the flow of alternating current depends upon the amount of reactive power.

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.

Last Answer : Answer: C

Complete maintenance of electrical motors should include periodic checks for machine _____________. A. vibration B. watertight integrity C. speed droop D. reactive power

Description : Complete maintenance of electrical motors should include periodic checks for machine _____________. A. vibration B. watertight integrity C. speed droop D. reactive power

Last Answer : Answer: A

The apparent power in a purely inductive circuit is also known as _____________. A. true power B. lead power C. induced power D. reactive power

Description : The apparent power in a purely inductive circuit is also known as _____________. A. true power B. lead power C. induced power D. reactive power

Last Answer : Answer: D

What will be the reactive power and bus voltage whan the generator bus is treated as load bus.

Description : What will be the reactive power and bus voltage whan the generator bus is treated as load bus.

Last Answer : When the generator bus is treated as load bus, the reactive power of the bus is equated to the limit it has violated, and the previous iteration value of bus voltage is used for calculating current iteration value.

What is purpose of reactive power (VAR)?

Description : What is purpose of reactive power (VAR)?  

Last Answer : It is an energy required to built up magnetic field to drive the power.  

Illustrate how can you use a single-phase wattmeter to measure 3 phase reactive power in a circuit?

Description : Illustrate how can you use a single-phase wattmeter to measure 3 phase reactive power in a circuit?

Last Answer : We can measure reactive power of 3 phase circuit by dingle phase wattmeter by connecting the current coil in series with a line or load and connecting the pressure coil across the other two lines.  Reactive power = 3√ V * I * sinϕ Watts. 

Explain the terms real power, apparent power and reactive power for ac circuits and also the units used.

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.

The voltage of a particular bus can be controlled by controlling the a) Active power of the bus b) Reactive power of the bus c) Phase angle d) All of the above

Description : The voltage of a particular bus can be controlled by controlling the a) Active power of the bus b) Reactive power of the bus c) Phase angle d) All of the above

Last Answer : b) Reactive power of the bus

In a load flow analysis of a power system, the load connected at a bus is represented as a) Constant current drawn from the bus b) Constant impedance connected at the bus c) Voltage and frequency dependent sources at the boss d) Constant real and reactive power drawn from the bus

Description : In a load flow analysis of a power system, the load connected at a bus is represented as a) Constant current drawn from the bus b) Constant impedance connected at the bus c) Voltage and frequency dependent sources at the boss d) Constant real and reactive power drawn from the bus

Last Answer : d) Constant real and reactive power drawn from the bus

In power system, if a voltage controlled bus is treated as a load bus then which one of the following limits would be violated? a) Voltage b) Active power c) reactive power d) Phase angle

Description : In power system, if a voltage controlled bus is treated as a load bus then which one of the following limits would be violated? a) Voltage b) Active power c) reactive power d) Phase angle

Last Answer : a) Voltage

In load flow studies of a power system, a voltage control bus is specified by a) Real power and reactive power b) Reactive power and voltage magnitude c) Voltage and voltage phase angle d) Real power and voltage magnitude

Description : In load flow studies of a power system, a voltage control bus is specified by a) Real power and reactive power b) Reactive power and voltage magnitude c) Voltage and voltage phase angle d) Real power and voltage magnitude

Last Answer : d) Real power and voltage magnitude

The thickness of the layer of insulation on the conductor, in cables, depends upon (a) Reactive power (b) Power factor (c) Voltage (d) Current carrying capacity

Description : The thickness of the layer of insulation on the conductor, in cables, depends upon (a) Reactive power (b) Power factor (c) Voltage (d) Current carrying capacity

Last Answer : (c) Voltage

Where does reactive power go?

Description : Where does reactive power go?

Last Answer : Reactive power is not 'lost'. It is delivered to the motor where it sustains the electric field that enables the motor to convert the real power (electrical) into mechanical torque.

The component of electric power which yields useful mechanical power output is known as a) apparent power b) active power c) reactive power d) none of the above

Description : The component of electric power which yields useful mechanical power output is known as a) apparent power b) active power c) reactive power d) none of the above

Last Answer : b) active power

Which of the following statements are true? i) reactive current is necessary to build up the flux for the magnetic field of inductive devices ii) some portion of reactive current is converted into work iii) the cosine of angle between kVA and kVAr vector is called power factor iv) the cosine of angle between kW and kVA vector is called power factor a) i & iv b) ii & iii c) i & iii d) iii & iv

Description : Which of the following statements are true? i) reactive current is necessary to build up the flux for the magnetic field of inductive devices ii) some portion of reactive current is converted into work iii) the cosine of angle ... called power factor a) i & iv b) ii & iii c) i & iii d) iii & iv

Last Answer : a) i & iv

The voltage control in electric supply networks in required on account of which of the following reasons ? (a) Adjustment of voltage at consumers premises within statutory limits (b) Control of active and reactive power (c) Adjustment of short period daily and seasonal voltage variations in accordance with variations of load (d) All of the above

Description : The voltage control in electric supply networks in required on account of which of the following reasons ? (a) Adjustment of voltage at consumers premises within statutory limits (b) Control of ... daily and seasonal voltage variations in accordance with variations of load (d) All of the above

Last Answer : (d) All of the above

Use Voltmeter, ammeter, wattmeter to determine active, reactive and apparent power consumed in given R—C series circuit, draw phasor diagram.

Description : Use Voltmeter, ammeter, wattmeter to determine active, reactive and apparent power consumed in given R—C series circuit, draw phasor diagram.

Last Answer : Use Voltmeter, ammeter, wattmeter to determine active, reactive and apparent power consumed in given R-C series circuit, draw phasor diagram. Practical Significance In the industry environment ... autotransformer position to zero and switch OFF the supply. 8. Draw the phasor diagram.

Use Voltmeter, ammeter, wattmeter to determine active, reactive and apparent power consumed in given R-L series circuit, draw phasor diagram.

Description : Use Voltmeter, ammeter, wattmeter to determine active, reactive and apparent power consumed in given R-L series circuit, draw phasor diagram.

Last Answer : Practical Significance In the industry environment Electrical Engineering diploma graduate are expected to measure basic parameters like voltage, frequency, time period etc. for R-L series circuits. Therefore ... /varying L. 7. Draw the phasor diagram for each of reading for verification.

State the necessity of reactive power compensation equipment. List out the devices used for reactive power compensation and give application of each device.

Description : State the necessity of reactive power compensation equipment. List out the devices used for reactive power compensation and give application of each device.

Last Answer : Necessity of reactive power compensation equipment :  i. Due to reduction in reactive power flow there is reduction in tr. Line current & reduction in line losses. So to ... 2. Series compensation equipments - Series reactors  3. Synchronous compensation equipments - Synchronous condenser 

Define active power and reactive power for RLC series circuit.

Description : Define active power and reactive power for RLC series circuit.

Last Answer : Active Power (P): Active power (P) is given by the product of voltage, current and the cosine of the phase angle between voltage and current.  Unit: watt (W) or kilo-watt (kW) or Mega-watt ... volt-ampere-reactive (VAr), or kilo-volt-ampere-reactive (kVAr) or Mega-voltampere-reactive (MVAr) 

Explain reactive power compensation in Transmission and Distribution systems.

Description : Explain reactive power compensation in Transmission and Distribution systems.

Last Answer : Reactive power compensation in Transmission and Distribution systems: The reactive power is present in lines due to the reactive loads and device/ component reactances. This leads to heavy ... Diagram shows a scheme of reactive power compensation used in transmission and distribution systems. 

With neat diagram explain use of “reactive power controller” to reduce technical losses in transmission and distribution system.

Description : With neat diagram explain use of “reactive power controller” to reduce technical losses in transmission and distribution system.

Last Answer : Reactive power compensation in Transmission and Distribution systems: The reactive power is present in lines due to the reactive loads and device/ component reactance. This leads to heavy currents for active ... switched to the line as per the requirement of lagging or leading reactive VA. 

Explain the term reactive power. Why it is sometimes essential to measure reactive power?

Description : Explain the term reactive power. Why it is sometimes essential to measure reactive power?

Last Answer : Reactive power: The reactive power (Q) is defined as the product of voltage(V), current (I) and sine of angle between voltage(V) and current( I) Therefore Reactive power Q = V I ... power so that corrective measures can be taken accordingly to maintain systems power factor near to the unity.