125 views

Yes ammeter has its own resistance

Not only ammeter every electrical devices has there own resistance practicaly

Not only ammeter every electrical devices has there own resistance practicaly

answered
Jan 21, 2018
by
NITIN P. DESHMUKH

101 views

**Description :** 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

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

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**Description :** 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 ... high value of charging current (D) Cables have a low value of capacitance and initial resistance

**Last 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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A PMMC instrument has FSD of 100 μA and a coil resistance of 1 kΩ. To convert the instrument into an

**Description :** 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

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

**Last Answer :** The transducer with negative temperature co-efficient of resistance is Thermistor

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

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

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**Last 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 :** What affect does the thickness of a wire have on its resistance?

**Last Answer :** Ans: The resistance of a wire decreases as its thickness increases.

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**Description :** Which of these has the lowest resistance?

**Last Answer :** b) Copper has the lowest resistance.

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**Description :** Name two materials that have a different electric resistance.

**Last Answer :** Ans: a) copper, nichrome

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

**Last 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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**Description :** State the impact of inductance and resistance on transmission line performance

**Last Answer :** Impact of inductance on transmission line: 1) It causes IXL drop in transmission line which affects regulation. 2) It is the only parameter which decides power transmission capacity of line i. ... is very small, it causes losses, temperature rise& poor voltage regulation so it cannot be neglected

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**Description :** What do you mean by exciting resistance and exciting reactance?

**Last Answer :** At no-load, a transformer behaves as a highly inductive load connected to the system which contains some resistance and inductance in parallel. The resistance is called exciting resistance R0 = V1/I w and reactance is called exciting reactance, X0 = V1/I mag

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**Description :** Write measures to be taken to maintain the insulation resistance of electrical machines to healthy levels.

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**Description :** Resistance

**Last Answer :** .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }

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**Description :** what is equivalent resistance when four 4 Ohm resistors are connected in i) series ii) parallel

**Last Answer :** equivalent resistance

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**Description :** role of the series resistance connected in PMMC movement.

**Last Answer :** A PMMC Instrument can be used as voltmeter by just connecting a series resistance with the moving coil. This series resistance is called Voltmeter Multiplier. This combination of moving coil and ... current whose voltage is to be measured. Ideally the resistance of voltmeter should be infinite

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**Description :** Define resistance with its unit.

**Last 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 :** List two advantages of platinum resistance thermometer.

**Last Answer :** 1. The platinum resistance thermometer is stable 2. It is resistant to corrosion 3. It is resistant to oxidation

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**Description :** What is the mathematical relationship between resistance and conductance?

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**Description :** How does the resistance of a conductor compare to that of an insulator?

**Last Answer :** The resistance of a conductor can be significantly lower than the resistance of an insulator, depending on each material's atomic properties.

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**Description :** Resistance formula

**Last Answer :** The formula for resistance is, Where, R = resistance in Ohms ρ = resistivity in ohm - metre l = length A = cross sectional area

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**Description :** Parallel Reactance and Resistance Example 1

**Last Answer :** Parallel Reactance and Resistance Example 1

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**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.

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**Description :** Problems on resistance and resistivity

**Last Answer :** Problem on resistance and resistivity 1 : https://youtu.be/OqavD7OlZUs Problem on resistance and resistivity 2 : https://youtu.be/0eo8VO8cpwk Problem on resistance and resistivity 3 : https:// ... https://youtu.be/3neLRCTz0RQ Problem on resistance and resistivity 13 : https://youtu.be/vBCkvPOiztY

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**Description :** Problem on temperature coefficient of resistance 3

**Last Answer :** Problem on temperature coefficient of resistance 3

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**Description :** Problem on temperature coefficient of resistance 2

**Last Answer :** Problem on temperature coefficient of resistance 2

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**Description :** Problem on temperature coefficient of resistance 1

**Last Answer :** Problem on temperature coefficient of resistance 1

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**Description :** Problem on resistance and resistivity 13

**Last Answer :** Problem on resistance and resistivity 13

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**Description :** Problem on resistance and resistivity 12

**Last Answer :** Problem on resistance and resistivity 12

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**Description :** Problem on resistance and resistivity 11

**Last Answer :** Problem on resistance and resistivity 11

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**Description :** Problem on resistance and resistivity 10

**Last Answer :** Problem on resistance and resistivity 10

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**Description :** Problem on resistance and resistivity 9

**Last Answer :** Problem on resistance and resistivity 9

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**Description :** Problem on resistance and resistivity 8

**Last Answer :** Problem on resistance and resistivity 8

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**Description :** Problem on resistance and resistivity 7

**Last Answer :** Problem on resistance and resistivity 7

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**Description :** Problem on resistance and resistivity 6

**Last Answer :** Problem on resistance and resistivity 6

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**Description :** Problem on resistance and resistivity 5

**Last Answer :** Problem on resistance and resistivity 5

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**Description :** Problem on resistance and resistivity 4

**Last Answer :** Problem on resistance and resistivity 4

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**Description :** Problem on resistance and resistivity 3

**Last Answer :** Problem on resistance and resistivity 3

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**Description :** Problem on resistance and resistivity 2

**Last Answer :** Problem on resistance and resistivity 2

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**Description :** Problem on resistance and resistivity 1

**Last Answer :** Problem on resistance and resistivity 1

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**Description :** Compare between Resistance welding and Arc welding on any six points.

**Last Answer :** Sr.No Parameters Resistance Welding Arc Welding 1 Type of welding Plastic/Pressure/Non-fusion welding Fusion/Non pressure welding 2 Principle of heat developed Heat ... It is suitable for mass production It is suitable for heavy job, maintenance and repair work

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**Description :** Name two methods for measurement of low, medium and high resistance. Give one advantage and one limitation of V- I method.

**Last Answer :** Methods for measurement of low resistance: 1. Ammeter voltmeter method 2. Kelvin's bridge method 3. Ohm meter method 4. Potentiometer method 5. Digital/analog multi-meter ... must be infinity for perfectly accurate measurement which is not possible. 2. Connection errors.

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

**Last 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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**Description :** Write any two factors on which earth resistance depends.

**Last Answer :** Factors on which earth resistance depends: (1) The shape and material used for the electrode (2) Depth of the electrode in the ground. (3) The specific resistance of the soil around the electrode (4) Moisture content in the soil. (5) Nature of soil

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**Description :** State the use of shunt and series resistance used in extension of meter.

**Last Answer :** Use of shunt and series resistance: i) Use of shunt: To extend the range of Ammeter. ii) Use of series resistance: To extend the range of Voltmeter.

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**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.

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**Description :** Explain V- I method of measurement of medium resistance.

**Last Answer :** In this method, use suitable source, ammeter and voltmeter and connect them as shown in the above diagram. Take reading of voltmeter and ammeter, then value of resistance = R = V/I Ω To minimise the error take 4 to 5 observation for the same resistance and take their average.

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**Description :** Give classification of resistance based on their ranges.

**Last Answer :** Classification of Resistances Based on Their Ranges: 1) Low resistance: less than 1 ohm. 2) Medium resistance: 1 ohm to 0.1 Mega ohms. 3) High resistance: greater than 0.1 Mega ohms.

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