How range of A.C. ammeter & A.C. voltmeter is extended? Draw suitable diagram.

How range of A.C. ammeter & A.C. voltmeter is extended? Draw suitable diagram.
by

1 Answer

Answer :

Extension of A.C. Ammeter Range: The range of a.c. ammeter can be extended by using CT, the arrangement is shown in figure. The CT is current transformer having less number of primary turns carrying high magnitude of line current and more number of secondary turns hence reducing the secondary current as per its CT ratio. The low range ammeter can be connected in secondary circuit for measurement of reduced line current, which indirectly measure high magnitude of line current. In this way range of a.c. ammeter can be extended. 


Extension of A.C. Voltmeter Range: The range of a.c. voltmeter can be extended by using PT, the arrangement is shown in figure. The PT is potential transformer having more number of primary turns connected to the high voltage source and less number of secondary turns hence reducing the secondary voltage as per its PT ratio. The low range voltmeter can be connected to secondary for measurement of reduced source voltage, which indirectly measure high magnitude of source voltage. In this way range of a.c. voltmeter can be extended.

image

by

Related questions

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.

Draw a typical electric circuit including ammeter and voltmeter.

Description : Draw a typical electric circuit including ammeter and voltmeter.

Last Answer : The figure shows typical electric circuit including ammeter and voltmeter. Ammeter is connected in series for measurement of current. Voltmeter is connected in parallel for measurement of voltage. Fuse is use ... are used. If the electric supply is DC the DC ammeter and DC voltmeter are used.

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.

operation of half wave rectifier type AC Voltmeter.

Description : operation of half wave rectifier type AC Voltmeter.

Last Answer :  Half-wave Rectifier Voltmeter The d'Arsonval meter movement only responds to the average or dc value of the current through the moving coil. In order to measure alternating ... ) input voltage signal alternating signal needs to be rectified first by using diode rectifier to produce 

An ac voltmeter using full -wave rectification and having a sinusoidal input has an ac sensitivity equal to

Description : An ac voltmeter using full -wave rectification and having a sinusoidal input has an ac sensitivity equal to  (1) 1.414 times dc sensitivity (2) dc sensitivity (3) 0.9 times dc sensitivity (4) 0.707 times dc sensitivity

Last Answer : An ac voltmeter using full -wave rectification and having a sinusoidal input has an ac sensitivity equal to 0.9 times dc sensitivity

An unshielded moving iron voltmeter is used to measure the voltage in an AC circuit. The stray DC magnetic

Description : An unshielded moving iron voltmeter is used to measure the voltage in an AC circuit. The stray DC magnetic field having a component along the axis will be  (1) unaffected (2) decreased (3) increased (4) either decreased or increased depending on the direction of the DC field

Last Answer : An unshielded moving iron voltmeter is used to measure the voltage in an AC circuit. The stray DC magnetic field having a component along the axis will be either decreased or increased depending on the direction of the DC field

can ammeter measure ac?

Last Answer : Yes it can...

With neat diagram, explain the working of clip-on ammeter.

Description : With neat diagram, explain the working of clip-on ammeter.

Last Answer : Working of Clip on Ammeter: Clip on ammeters are used to measure the high current flowing through bus bar, cable or fuse holders, which act as primary. It consists of split core current ... then clipped over the current carrying conductor. The dial will record the current directly. 

Describe procedure for calibration of ammeter with diagram.

Description : Describe procedure for calibration of ammeter with diagram.

Last Answer : Procedure for Calibration of Ammeter:  In this method, DC potentiometer is used for measurement of voltage across a standard low resistance.  Connect the circuit as shown in the figure, ... S = resistance of potentiometer  And the currents are compared for finding out error in ammeter.

State the application of phase sequence indicator; clip on ammeter, frequency meter & P.F. meter.

Description : State the application of phase sequence indicator; clip on ammeter, frequency meter & P.F. meter.

Last Answer : Phase Sequence Indicator:  1. For finding correct phase sequence of supply  2. For obtaining exact instant of parallel operation of alternators.  3. For obtaining reversal of rotation ...  4. In electroplating industries   5. In various processes industries for measuring power factor

advantages of DVM over electric voltmeter?

Description : advantages of DVM over electric voltmeter?

Last Answer : Advantages:  1) In case of digital volt meter the output signals is available in the form of discrete numerical. Where as in analog voltmeter, output is made available by using pointer ... using a suitable transducer the quantities such as temperature, pressure, etc. can also be measured.

what is voltmeter ?

Description : what is voltmeter ?

Last Answer : Voltmeter is an instrument which is use for measuring voltage in volts.

Write any two disadvantages of ammeter shunts.

Description : Write any two disadvantages of ammeter shunts.

Last Answer : Disadvantages of ammeter shunts: 1. Errors are caused because of change in temperature. 2. Most suitable for DC measurement. 3. Power loss takes place.

what is ammeter ?

Description : what is ammeter ?

Last Answer : An instrument that is used to measure the amount of current flowing in a circuit.

The operation of a ramp type Digital Voltmeter is based on the principle of

Description : The operation of a ramp type Digital Voltmeter is based on the principle of (A) Voltage-to-current conversion. (B) Voltage-to-time conversion. (C) Current-to-time conversion. (D) Current-to-frequency conversion.

Last Answer : The operation of a ramp type Digital Voltmeter is based on the principle of Voltage-to-time conversion.

The multiplier and the meter coil in a voltmeter are in?

Last Answer : The multiplier and the meter coil in a voltmeter are in series.

can voltmeter measure resistance?

Last Answer : Voltmeter is used to measure voltage in a circuit.Ohmmeter is used to measure the resistance of a component in a circuit.

The function of shunt in an ammeter is to?

Last Answer : The function of shunt in an ammeter is to by pass the current.

An ammeter is a?

Last Answer : An ammeter is a secondary instrument.

What should be the ideal resistance of ammeter ?

Description : What should be the ideal resistance of ammeter ?

Last Answer : Ideal resistance of ammeter should be zero.

what happens when ammeter is connected in parallel?

Last Answer : Ammeter is a current measuring device having low internal resistance so as to direct all the current flowing in the circuit through it. Hence Ammeter is always connected in series with the circuit. If ... If Ammeter is connected in parallel with the supply, then the supply will be a short circuit.

State RADAR range equation and write factor influencing maximum range.

Description : State RADAR range equation and write factor influencing maximum range.

Last Answer : Free Space RADAR range Equation: 1.RADAR range equation relates the range of a RADAR to the chara. Of Tx, Rx, Antenna, target & environment. 2.Free space means RADAR and target are isolated in ... is no obstacle between RADAR antenna & the target. 4.There will be No absorption of EM waves.

State the advantages of instrument transformer in using for extension of range of meters.

Description : State the advantages of instrument transformer in using for extension of range of meters. 

Last Answer : Advantages of instrument transformer: 1. Extension of instrument range is possible. 2. Isolation of instruments from high voltage side. 3. Power loss is less as compared to shunts and multipliers. 4 ... measurement. 5. It is economical method of range extension. 6. Increases in safety of operator.

State the range for low and medium resistance.

Description : State the range for low and medium resistance.

Last Answer : Low resistances: less than 1 ohm.  Medium resistances: 1 ohm to 0.1 Mega ohm. 

List two types of oscillator, which generates frequency in RF range.

Description : List two types of oscillator, which generates frequency in RF range.

Last Answer : Types of Oscillators generating frequencies in RF range: i) Hartley Oscillator ii) Colpitt’s Oscillator iii) Clapp Oscillator

How to Light the Pilot Light on a Gas Range

Description : How to Light the Pilot Light on a Gas Range

Last Answer : How to Light the Pilot Light on a Gas Range Gas ranges are easy to work with, you just turn the knob and they're ready to be used. Sometimes, though, your gas range's pilot light goes off, ... , though, it's best to contact a local gas company or the manufacturer, to help you solve the problem.

Define: i) Range ii) Span of instruments

Description : Define: i) Range ii) Span of instruments

Last Answer : i) Range: It is defined as the difference between Greatest and Smallest value of the data or reading of the instrument.  ii) Span: It is defined as the algebraic difference between the upper and lower range values

What is the frequency range of VHF electromagnetic waves?

Description : What is the frequency range of VHF electromagnetic waves? A) 30-300 kHz B) 30-3000 kHz C) 30-300 MHz D) 30-3000 MHz

Last Answer : What is the frequency range of VHF electromagnetic waves? A) 30-300 kHz B) 30-3000 kHz C) 30-300 MHz D) 30-3000 MHz

For arc welding current range is usually

Description : For arc welding current range is usually  (1) 10 to 15 A (2) 30 to 40 A (3) 50 to 100 A (4) 100 to 350 A

Last Answer : For arc welding current range is usually 100 to 350 A

The range of frequencies used in induction heating is :

Description : The range of frequencies used in induction heating is :  (A) 0-25 Hz  (C) less than 200 Hz  (B) 50 to 100 Hz  (D) more than 1 kHz

Last Answer : The range of frequencies used in induction heating is : more than 1 kHz

The braking retardation is usually in the range?

Last Answer : The braking retardation is usually in the range 10 to 15 km phps.

For diesel locomotives the range of horsepower is?

Last Answer : For diesel locomotives the range of horsepower is 1500 to 2500.

The wattage rating for a ceiling fan motor will be in the range?

Last Answer : The wattage rating for a ceiling fan motor will be in the range 50 to 150 W .

The range of efficiency for shaded pole motors is?

Last Answer : The range of efficiency for shaded pole motors is 5% to 35%.

The efficiency of a properly designed synchronous motor will usually fall in range?

Last Answer : The efficiency of a properly designed synchronous motor will usually fall in range 85 to 95%.

‘PMMC instrument is not suitable to measure AC quantity’. State the reason.

Description : ‘PMMC instrument is not suitable to measure AC quantity’. State the reason.

Last Answer : The direction of force exerted on moving coil depends on the direction of current flowing through moving coil. If the direction of magnetic field is kept constant, it produces unidirectional torque if the current is ... on the coil in one cycle to zero. Hence the meter cannot read A.C. quantities.

Draw the circuit diagram of multi range AC voltmeter and describe its working

Description : Draw the circuit diagram of multi range AC voltmeter and describe its working

Last Answer : The above circuit looks like a multi range AC voltmeter. We know that, we will get AC voltmeter just by placing rectifier in series (cascade) with DC voltmeter. The above circuit was created ... any two points of an electric circuit, by connecting the switch, S to the desired voltage range.

Explain the principle of ON OFF control and phase control of AC voltage controller with suitable circuit and waveforms.

Description : Explain the principle of ON-OFF control and phase control of AC voltage controller with suitable circuit and waveforms.

Last Answer : The integral cycle control (on-off control) and phase angle control are the two types of AC voltage controller. The principle of ON-OFF control: The on-off control is also called an integral cycle ... control. In phase control, the switch is on for some period of each cycle.  

Explain working of AC circuit breaker using SCR with circuit diagram.

Description : Explain working of AC circuit breaker using SCR with circuit diagram.

Last Answer : AC Circuit Breaker:  The circuit configuration of static AC circuit breaker using SCR is shown in the figure. When switch S' is closed, the SCRs T1 and T2 are fired in positive ... to non-availability of gate current. Thus the maximum time delay for breaking the circuit is one half-cycle.

A voltmeter of range 2 V and resistance `300 Omega` cannot be converted into ammeter of range

Description : A voltmeter of range 2 V and resistance `300 Omega` cannot be converted into ammeter of range

Last Answer : A voltmeter of range 2 V and resistance `300 Omega` cannot be converted into ammeter of range A. `1 A` B. `1 mA` C. `100 mA` D. `10 mA`

A milli voltmeter of 25 milli volt range is to be converted into an ammeter of 25 ampere range. The value (in ohm) of necessary shunt will be

Description : A milli voltmeter of 25 milli volt range is to be converted into an ammeter of 25 ampere range. The value (in ohm) of necessary shunt will be

Last Answer : A milli voltmeter of 25 milli volt range is to be converted into an ammeter of 25 ampere range. The value (in ohm) ... 001` B. `0.01` C. 1 D. `0.05`

In order to increase its range of measurement, a resistance would be placed in series with which of the following instruments? A. DC voltmeter B. DC ammeter C. frequency meter D. power factor meter

Description : In order to increase its range of measurement, a resistance would be placed in series with which of the following instruments? A. DC voltmeter B. DC ammeter C. frequency meter D. power factor meter

Last Answer : Answer: A

For transmission of power over a distance of 500 km, the transmission voltage should be in the range (a) 150 to 220 kV (b) 100 to 120 kV (c) 60 to 100 kV (d) 20 to 50 kV

Description : For transmission of power over a distance of 500 km, the transmission voltage should be in the range (a) 150 to 220 kV (b) 100 to 120 kV (c) 60 to 100 kV (d) 20 to 50 kV

Last Answer : (a) 150 to 220 kV

Range of a voltmeter can be extended by connecting a

Description : Range of a voltmeter can be extended by connecting a

Last Answer : Range of a voltmeter can be extended by connecting a Multiplier in series

A DC ammeter has resistance `0.1 Omega` and its current ranges `0-100 A`. If the range is to be extended to `0-500`, then the following shunt resistan

Description : A DC ammeter has resistance `0.1 Omega` and its current ranges `0-100 A`. If the range is to be extended to `0-500`, then the following shunt resistan

Last Answer : A DC ammeter has resistance `0.1 Omega` and its current ranges `0-100 A`. If the range is to be extended ... Omega` C. `0.025 Omega` D. `0.25 Omega`

What is meant by Voltmeter & Ammeter ?

Description : What is meant by Voltmeter & Ammeter ?

Last Answer : Voltmeter measures the voltage of any load or any line and the voltmeter has to be connected parallel to the load. The ammeter measures the current flowing through a load or the current of an electrical line. The ammeter is connected in series with the load.

Which of the following will happen if a voltmeter is connected like an ammeter in series to the

Description : Which of the following will happen if a voltmeter is connected like an ammeter in series to the load ? (A) There will be almost no current in the circuit. (B) The meter will burn. (C) The measurement will be trio high. (D)  A very high current will flow.

Last Answer : Which of the following will happen if a voltmeter is connected like an ammeter in series to the load ? (A) There will be almost no current in the circuit. (B) The meter will burn. (C) The measurement will be trio high. (D)  A very high current will flow.

Alternating current (AC)

Description : Alternating current (AC)

Last Answer : AC stands for Alternating Current meaning voltage or current that changes polarity or direction respectively over time. An Alternating Current (AC) is an electric current whose magnitude ... energy are known as alternators and are simpler construction than DC electromechanical generators.

Why are DC motors used in trains and not AC motors ?

Description : Why are DC motors used in trains and not AC motors ?

Last Answer : The reason is torque. torque is inversely proportional to speed..i.e when th knowe train comes to rest position to motion.. initial speed is zero..so it requires high starting torque for ... current will flow through field and armature coils then maximum torque is available at the intial condition.

Why is AC considered more efficient than DC?

Description : Why is AC considered more efficient than DC?

Last Answer : Ac is more efficient than dc because it is easy to maintain and change the voltage of ac for transmission and distribution purpose. Plant cost of ac transmission is much lower compared to dc transmission. When fault occurs it is easy to interrupt ac supply.