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what is voltmeter ?
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Voltmeter is an instrument which is use for measuring voltage in volts.
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Description :

advantages of DVM over electric voltmeter?

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.

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Description :

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

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 ... high magnitude of source voltage. In this way range of a.c. voltmeter can be extended.

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Description :

Draw a typical electric circuit including ammeter and voltmeter.

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.

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Description :

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

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.

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Description :

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

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.

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Description :

operation of half wave rectifier type AC Voltmeter.

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 

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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

Answer :

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

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477 views 1 answer
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

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

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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.

Answer :

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

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Description :

Answer :

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

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154 views 1 answer
Description :

Answer :

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

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Description :

Answer :

 What should be observed when connecting a voltmeter into a DC circuit? A.  rms B.  resistance C.  polarity D.  power factor

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Description :

What will happen if a voltmeter is connected like an ammeter in series of the load ? (a) The meter will burn out. (b) The measurement will be too high. (c) The same current will flow as would have been with ammeter in circuit. (d) There will be almost no current in the circuit. 

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Description :

A battery is known to have an EMF of 5.0V but when a certain voltmeter is connected to it the reading is 4.9V. The battery can deliver a current of 0.40A when connected to a resistance of 12ohms. What is the resistance of the voltmeter?

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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.

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.

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68 views 1 answer
Description :

A dc voltmeter has a sensitivity of 1000 Ohm/V. When it measures half full scale in 100 V range, the current through the voltmeter is

Answer :

A dc voltmeter has a sensitivity of 1000 Ohm/V. When it measures half full scale in 100 V range, the current through the voltmeter is 1 mA.

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657 views 1 answer
Description :

A 1mA D' Arsonval movement has resistance of 100 Ω. It is to be converted to a 10 V voltmeter. The value of multiplier resistance is  (A) 999 Ω (B) 9999 Ω (C) 9900 Ω (D) 990 Ω 

Answer :

A

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Description :

The capacitance of 0-1000V electrostatic voltmeter increases from 36-42 pF from zero to full scale deflection. It is required to extend the range of voltmeter to 10000 V by using an external series capacitor. What should be the value of series capacitor?  (A) 0.8 pF (B) 1.00 pF (C) 6.644 pF (D) 4.667 pF 

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Description :

Answer :

Voltmeter is a galvanometer with high resistance

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Description :

The voltage of a circuit is measured by a voltmeter having input impedance comparable with the output impedance of the circuit thereby causing error in voltage measurement. This error may be called as_________.

Answer :

The voltage of a circuit is measured by a voltmeter having input impedance comparable with the output impedance of the circuit thereby causing error in voltage measurement. This error may be called as error caused by loading effect.

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Description :

Answer :

The internal resistance of the voltmeter must be very high in order to have Minimum current through the meter.

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Description :

Electric current is measured using which of the following instrument ? (1) Ammeter (2) Voltmeter (3) Anemometer (4) Wattmeter

Answer :

Ammeter

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20 views 1 answer
Description :

A galvanometer can be converted to a voltmeter by connecting (1) a high resistance in parallel (2) a high resistance in series (3) a low resistance in series (4) a low resistance in parallel

Answer :

a high resistance in series

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10 views 1 answer
Description :

A galvanometer can be converted into a voltmeter by connecting with it a (1) high resistance in parallel (2) low resistance on parallel (3) high resistance on series (4) low resistance in series

Answer :

high resistance on series

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Description :

Conversion of heat into electrical er is achieved by using : (1) Ammeter (2) Hydrometer (3) Voltmeter (4) Thermocouple

Answer :

Thermocouple

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Description :

Explain with neat sketch, the working of full wave rectifier voltmeter.

Answer :

Full Wave Rectifier Type Voltmeter: Working of full wave rectifier type A. C. Voltmeter Referring to the circuit diagram, for rectification, a full wave bridge circuit (ABCD) is used. Input ... current passing through meter is given as, which causes full scale deflection of the meter.

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Description :

State the purpose of calibration of measuring instruments. Explain the procedure of calibration of D.C. voltmeter by using D.C. potentiometer.

Answer :

Purpose of calibration : Calibration is the process of evaluating and adjusting the precision and accuracy of measuring equipment. Proper calibration of an instrument allows people to have a safe ... calibration curve can be drawn by plotting the percentage error against the measured voltages. 

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Description :

The full scale range of PMMC voltmeter is 100 V and its sensitivity is 1000 Ω/V. If the meter reads 50 V, the current through the voltmeter is (A) 0.05 mA (B) 0.5 mA (C) 5 mA (D) 50 mA 

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Description :

Measurement of power by voltmeter and ammeter method in a circuit resulted in calculated maximum errors of ±1 % and ± 2 %, respectively. The likely error in calculated power is (A) ± 3 % (B) ± 0.022 % (C) ± 1.5 % (D) ± 0.22 % 

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Description :

A digital voltmeter has a read-out range from 0 to 9999 counts. When full scale reading is 9.999 V, the resolution of the instrument will be (a) 100 mV (b) 99 mV (c) 9 mV (d) 1 mV 

Answer :

d) 1mV 9.999v÷9999v

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Description :

The sensitivity of a voltmeter using 0-5 mA meter movement is (a) 200 Ω/V (b) 150 Ω/V (c) 100 Ω/V (d) 50 Ω/V 

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Description :

The moving iron voltmeter indicates (a) the same value for dc and ac voltages. (b) lower values for ac voltage than for corresponding dc voltage. (c) higher value for ac voltage than for corresponding dc voltage. (d) none of these. 

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Description :

A peak reading voltmeter has been calibrated with a sine wave signal and scaled in rms volts. If a square wave signal ± 1V peak is applied, the meter reading will be (a) 0.555 V (b) 0.707 V (c) 1 V (d) 1.75 V

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Description :

In a digital voltmeter, the oscillator frequency is 400 kHz, the ramp voltage falls from 8V to 0V in 20 m sec. The number of pulses counted by the counter is (a) 800 (b) 2000 (c) 4000 (d) 8000

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Description :

 In the case of an instrument reading of 8.3 V with a 0 to 150 voltmeter having a guaranteed accuracy of 1% full scale reading, the percentage limiting error is   (A) 1.810% (B) 0.181% (C)12.45% (D) 0.0018%

Answer :

 In the case of an instrument reading of 8.3 V with a 0 to 150 voltmeter having a guaranteed accuracy of 1% full scale reading, the percentage limiting error is 12.45%

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Description :

An analog voltmeter has a sensitivity of 10kΩ/volt. The galvanometer used in constructing the instrument will produce a full scale deflection when the current passed through it is  (a) 10 mA (b) 20 mA (c) 50 mA (d) 100 μA

Answer :

An analog voltmeter has a sensitivity of 10kΩ/volt. The galvanometer used in constructing the instrument will produce a full scale deflection when the current passed through it is 100 μA

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84 views 1 answer
Description :

In order to increase the range of a voltmeter

Answer :

In order to increase the range of a voltmeter a high resistance is connected in series

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Description :

An accurate voltmeter must have an internal impedance of (A) very low value. (B) very high value (C) medium value. (D) zero Value

Answer :

An accurate voltmeter must have an internal impedance of very high value

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Description :

Range of a voltmeter can be extended by connecting a

Answer :

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

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Description :

A digital voltmeter uses an A/D converter which needs a start pulse, uses an analog comparator and has a relatively fixed conversion time independent of the applied voltage. The A/D converter is : -  a) Successive Approximation Converter .b) Digital Ramp Converter c) Digital Slope Converter d) All the above

Answer :

A digital voltmeter uses an A/D converter which needs a start pulse, uses an analog comparator and has a relatively fixed conversion time independent of the applied voltage. The A/D converter is : -  Successive Approximation Converter 

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114 views 1 answer
Description :

A true rms reading voltmeter uses two thermocouple in order: -  a) to increase sensitivity b) that a second thermocouple cancels out the no linear effect of the first thermocouple c) to prevent drift in the dic. Amplifier d) all of the above

Answer :

A true rms reading voltmeter uses two thermocouple in order: -  that a second thermocouple cancels out the no linear effect of the first thermocouple

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Description :

An integrating digital voltmeter measures  A) true average value B) rms value C) peak value D) peak to peak value

Answer :

An integrating digital voltmeter measures true average value. 

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157 views 1 answer
Description :

Answer :

Ryall crest voltmeter is used for measurement of High AC voltage.

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Description :

A 0 to 300V voltmeter has a guaranteed accuracy of 1% of full scale reading. The voltage measured by the instrument is 83V. The percentage limiting error is

Answer :

A 0 to 300V voltmeter has a guaranteed accuracy of 1% of full scale reading. The voltage measured by the instrument is 83V. The percentage limiting error is 4.85%.

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232 views 1 answer
Description :

Answer :

 If a DC voltmeter is made from an ammeter having a fed of 100μA then its sensitivity (in KΩ/V) will be 10.

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196 views 1 answer
Description :

Answer :

The principle on which vector voltmeter is based is that it measures the amplitude of a single at two points and at the same time measures their phase difference

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2.6k views 1 answer
Description :

Answer :

If a voltmeter is connected, like an ammeter in series to the load: Almost no current will flow in the circuit

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85 views 1 answer
Description :

A 150 V moving iron voltmeter of accuracy class 1.0 reads 75 V when used in a circuit under a standard conditions. The maximum possible percentage error in the reading is:

Answer :

A 150 V moving iron voltmeter of accuracy class 1.0 reads 75 V when used in a circuit under a standard conditions. The maximum possible percentage error in the reading is:  2.0.

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409 views 1 answer
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