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To measure a resistance with the help of a potentiometer it is not necessary to standardise the potentiometer.

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Answer :

Yes we can use potentiometer for measuring resistance.

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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 :

To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken?

Answer :

To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken from the same source as the unknown voltage.

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Name the method used to measure following resistances:- (i) Low resistance (ii) Medium resistance (iii) Insulation resistance (iv) Earth resistance.

Answer :

Following are the methods used to measure resistances:-  (i) Low resistance: 1.Voltmeter-Ammeter Method 2. Kelvin's Double bridge Method  (ii) Medium resistance: 1.Voltmeter-Ammeter Method 2. ... of Charge Method  (iv) Earth resistance : 1. Fall of Potential Method 2. Earth tester

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The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a two-phase winding.

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In order to achieve high accuracy, the slide wire of a potentiometer should be as long as possible.

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Answer :

In an AC. co-ordinate potentiometer, the currents in the phase and quadrature potentiometer are adjusted to be out of phase by 90°.

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Description :

When the voltage across a battery is measured using a D.C potentiometer, the reading shows 1.08 V. But when the same voltage is measured using a Permanent Magnet Moving Coil (PMMC) voltmeter, the voltmeter reading shows 0.99 V. If the resistance of the voltmeter is 1100 Ohm , the internal resistance of the battery, in Ohm , is (A) 150 (B) 100 (C) 50 (D) 200

Answer :

When the voltage across a battery is measured using a D.C potentiometer, the reading shows 1.08 V. But when the same voltage is measured using a Permanent Magnet Moving Coil (PMMC) voltmeter, ... resistance of the voltmeter is 1100 Ohm , the internal resistance of the battery, in Ohm , is 100

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Answer :

Basically a potentiometer is a device for comparing two voltages.

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Answer :

A potentiometer may be used for measurement of resistance, measurement of current, calibration of ammeter, calibration of voltmeter.

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Answer :

It is required to measure the true open circuit e.m.f. of a battery. The best device is D.C. potentiometer.

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A rheostat differs from potentiometer in the respect that it?

Answer :

A rheostat differs from potentiometer in the respect that it has higher wattage rating.

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A Pyrheliometer is an instrument to measure :  (A) temperature of solar photovoltaic cell  (B) intensity of direct solar radiation at normal incidence  (C) intensity of indirect solar radiation  (D) efficiency of a solar photovoltaic cell

Answer :

A Pyrheliometer is an instrument to measure : intensity of direct solar radiation at normal incidence 

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Which of the following can be used to measure the capacitance of a capacitor? A) Rheostat B) Schering bridge C) Wheatstone bridge D) None of these

Answer :

Which of the following can be used to measure the capacitance of a capacitor? A) Rheostat B) Schering bridge C) Wheatstone bridge D) None of these

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Piezoelectric Transducer is used to measure  (1) displacement (2) resistance (3) current (4) temperature

Answer :

Piezoelectric Transducer is used to measure displacement 

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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

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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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What type of meter is used to measure current?

Answer :

Ammeter

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What equipment is used to measure voltage?

Answer :

Voltmeter is used to measure voltage.

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Integrating instruments are those which measure the total quantity of electricity delivered in a particular time.

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What is the unit of measure for voltage?

Answer :

Voltage measured in volts.

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Yes it can...

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

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.

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A moving coil meter has a resistance of 3 Ω and gives full scale deflection with 30 mA. To measure voltage up to 300 V, the external resistance to be connected in series with the instrument is (A) 9997 Ω (B) 10000 Ω (C) 997 Ω (D) 10003 Ω

Answer :

A moving coil meter has a resistance of 3 Ω and gives full scale deflection with 30 mA. To measure voltage up to 300 V, the external resistance to be connected in series with the instrument is 9997 Ω

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A _________ is used to measure the stator % winding temperature of the generator.  (A) Thermocouple (B) Pyrometer (C) Resistance thermometer (D) Thermometer

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A Resistance thermometer is used to measure the stator % winding temperature of the generator. 

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An open-circuit test on a transformer is conducted primarily to measure?

Answer :

The open-circuit test in a transformer is used to measure

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The transducer with negative temperature co-efficient of resistance is (A) Thermistor (B) Resistance Thermometer (C) Strain Gauge (D) Thermocouple

Answer :

The transducer with negative temperature co-efficient of resistance is Thermistor

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Draw venture meter and write steps to measure flow rate.

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Venturi meter consists of three sections that is converging section, throat section and diverging section. The flow is introduced to the meter through the inlet with diameter D' . The inclined angle ... to 15o . Flow rate is proportional to the square root of the differential pressure.

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

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.

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How do you measure the speed of a motor?

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A PMMC instrument has FSD of 100 μA and a coil resistance of 1 kΩ. To convert the instrument into an ammeter with full scale deflection of 100 mA, the required shunt resistance is (A) 1 Ω (B) 1.001 Ω (C) 0.5 Ω (D) 10 Ω

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A PMMC instrument has FSD of 100 μA and a coil resistance of 1 kΩ. To convert the instrument into an ammeter with full scale deflection of 100 mA, the required shunt resistance is 1.001 Ω

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List any four measure knobs on front panel on CRO.

Answer :

Knobs on front panel of CRO: 1. Power ON- OFF 2. Intensity control 3. Focus control 4. Astigmatism control 5. Volt/Div control 6. Vertical position control 7. Invert 8. Horizontal position control 9. Synchronization. 10. Channel selection.

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What are ways we can measure the flow of electrons?

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How do you measure power factor?

Answer :

P= 1.83*V*I*[email protected] where P is power           V is voltage            I is current           COS @ is P.F [email protected]= P/(1.83*V*I)  in other way cos @ = true power/apparent power

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What does an electric meter measure?

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Answer :

Meggar is an instrument which measures the insulation resistance of an electric circuit relative to earth and one another.

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Description :

A d.c. potentiometer is designed to measure up to about 2V with a slide wire of 800 mm. A standard cell of emf 1.18V obtains balance at 600 mm. A test cell is seen to obtain balance at 680 mm. The emf0fthe test cell is  A)1.00V B)1.34V C)1.50V D)1.70V 

Answer :

A d.c. potentiometer is designed to measure up to about 2V with a slide wire of 800 mm. A standard cell of emf 1.18V obtains balance at 600 mm. A test cell is seen to obtain balance at 680 mm. The emf0fthe test cell is 1.34V

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Answer :

For measuring a very high resistance we should use Meggar.

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Resistance grounding is normally used for :  (A) high voltage long over head transmission lines  (B) low voltage short over head transmission lines  (C) extra high voltage long over head transmission lines  (D) all the above

Answer :

Resistance grounding is normally used for : low voltage short over head transmission lines

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When measuring insulation resistance of cables using d.c. source, the galvanometer used should be initially short circuited because  (A) Cables have a low value of capacitance which draws a high value of charging current (B) Cables have a low value of initial resistance (C) Cables have a high value of capacitance which draws a high value of charging current (D) Cables have a low value of capacitance and initial resistance

Answer :

When measuring insulation resistance of cables using d.c. source, the galvanometer used should be initially short circuited because Cables have a high value of capacitance which draws a high value of charging current

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Description :

Answer :

Yes ammeter has its own resistance Not only ammeter every electrical devices has there own resistance practicaly

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Description :

We connected a 35V dc supply to a resistance of 600 Ohm in series with an unknown resistance R.A. voltmeter having a resistance of 1.2 kOhm is connected across 600 Ohm resistance and read 5v. The value of resistance R will be

Answer :

We connected a 35V dc supply to a resistance of 600 Ohm in series with an unknown resistance R.A. voltmeter having a resistance of 1.2 kOhm is connected across 600 Ohm resistance and read 5v. The value of resistance R will be 2.4 kOhm

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Description :

When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will?

Answer :

When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will increase.

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Description :

 A resistor in which the resistance changes exponentially with change in temperature is called as A) Potentiometer B) Phototransistor C) Varactor D) Thermistor 

Answer :

 A resistor in which the resistance changes exponentially with change in temperature is called as Thermistor 

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Description :

Consider a cube of material of sides 1 cm with a resistance of 0.003 Ω between its opposite faces. What is the resistance if the same volume of the material is drawn into a length of 50 cm with a uniform cross – section? A) 0.003 Ω B) 0.15 Ω C) 7.5 Ω D) None of these

Answer :

Consider a cube of material of sides 1 cm with a resistance of 0.003 Ω between its opposite faces. What is the resistance if the same volume of the material is drawn into a length of 50 cm with a uniform cross – section? A) 0.003 Ω B) 0.15 Ω C) 7.5 Ω D) None of these

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Description :

What is the resistance of a 160 m wire with a uniform diameter of 0.28 mm, if the specific resistance is 12.32 μΩ-cm? A) 3.2 Ω B) 3.2 μΩ C) 0.8 Ω D) None of these

Answer :

What is the resistance of a 160 m wire with a uniform diameter of 0.28 mm, if the specific resistance is 12.32 μΩ-cm? A) 3.2 Ω B) 3.2 μΩ C) 0.8 Ω D) None of these

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State the procedure for testing of earth pit resistance with necessary diagrams.

Answer :

Following procedure (Method) for testing of earth pit resistance with necessary diagrams. 1) Earth Tester : i) Three point method ii) Four point method 2) By Potential drop method 3 ... of that earthing pit. In this test the accuracy is less but electrical rods are not required. 

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141 views 1 answer
Description :

Define resistance with its unit.

Answer :

Resistance is a measure of the degree to which a substance impedes the flow of electric current induced by a voltage.  Or Resistance is the opposition to current flow in an electrical circuit. Unit is ohm.(Ω)

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Description :

AC Circuits with Resistance but No Reactance

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.

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73 views 1 answer
Description :

With rise in temperature the resistance of semi-conductors?

Answer :

With rise in temperature the resistance of semi-conductors decreases.

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129 views 1 answer
Description :

With rise in temperature the resistance of pure metals?

Answer :

With rise in temperature the resistance of pure metals increases.

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64 views 1 answer
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