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For measuring a very high resistance we should use Meggar.

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For measuring current at high frequency we should use thermocouple instrument.

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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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For measurement of inductance having high value, we should use Hay's bridge.

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

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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Answer :

Yes we can use potentiometer for measuring resistance.

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For high efficiency of transfer of power, internal resistance of the source should be?

Answer :

For high efficiency of transfer of power, internal resistance of the source should be less than the load resistance.

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The desirable static characteristics of a measuring system are accuracy, sensitivity and reproducibility.

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Wire-wound resistors are unsuitable for use at high frequencies because they?

Answer :

Wire-wound resistors are unsuitable for use at high frequencies because they exhibit unwanted inductive and capacitive effects.

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Which rotor is use for high speed in turbo alternators?

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Non-salient pole rotor is used for high speed in turbo alternators.

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For measurements on high voltage capacitors, the suitable bridge is Schering bridge.

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At very high temperatures, extrinsic semiconductor becomes intrinsic semiconductor because (A) Of drive in diffusion of dopants & carriers. (B) Band to band transition dominates impurity ionization. (C) Impurity ionization dominates band to band transition. (D) Band to band transition is balanced by impurity ionisation.

Answer :

At very high temperatures, extrinsic semiconductor becomes intrinsic semiconductor because Impurity ionization dominates band to band transition.

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calibration and the need of calibration for measuring instruments.

Answer :

Calibration - It is a process of estimating the value of a quantity by comparing that quantity with a standard quantity.    Need of calibration: - Calibration defines the accuracy and ... aim of calibration is to minimize any measurement uncertainty by ensuring the accuracy of test equipment.

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List three types of errors in measuring instruments. Give reasons of occurring for any one of them.

Answer :

Types of errors in measuring instruments:  A) Gross error: These are due to mistakes on the part of person using the instrument.  B) Systematic Error: i) Instrumental Error: These ... multiplying factor.  C) Random error: These persist even after gross and systematic errors are removed.

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Describe spring control method of producing controlling torque in measuring instrument. Write any two properties required for spring material.

Answer :

A)Spring control method: As shown in the figure, the inner ends of the both springs are attahced to the spindle, while outer end of upper spring is attached to the lever and outer ... of spring material: 1.Non Magnetic material 2.Low specific resistance 3.Low temperature coefficient of resistance

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Give the classification of the errors used in measuring instrument & state the reason for their occurrence.

Answer :

Types of errors in measuring instruments:  A) Gross error: These are due to mistakes on the part of person using the instrument.  B) Systematic Error:  i) Instrumental Error: These ... multiplying factor.  C) Random error: These persist even after gross and systematic errors are removed. 

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String efficiency is used for measuring the degree of utilization of SCR.

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State the advantages of use of high voltage in transmission of Electric power. 

Answer :

Advantages: 1. As Transmission voltage increases, current decreases. 2. As current decreases, cross section of conductor decreases. 3. As cross section of conductor decreases, its ... high voltage transmission line, successful interconnection of transmission line is possible than low voltage. 

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Buses, trains, trolleys, hoists, cranes require high starting torque and therefore make use of D.C. series motor.

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For maximum transfer of power, internal resistance of the source should be?

Answer :

For maximum transfer of power, internal resistance of the source should be equal to load resistance.

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Electrical Measuring Instruments

Answer :

Electrical Measuring Instruments

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Explain the essential toques in analog type measuring instruments.

Answer :

List of torques in analog instruments:  1. Deflecting torque  2. Controlling / Restraining torque.  3. Damping torque.  1. Deflecting torque: To create deflection proportional to ... the speed higher will be the damping torque bringing the pointer to the equilibrium position quickly. 

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State two purposes of calibration of measuring instruments.

Answer :

Purposes of calibration of measuring instruments: - The purpose of calibration is to ensure that readings of an instrument are consistent with other instruments. It is also important in determining the ... will need to be calibrated periodically to make sure it can function properly and safely. 

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Define following terms related to measuring instruments: i) Sensitivity ii) Selectivity.

Answer :

i) Sensitivity: It is the ratio of the change in output signal to the change in input signal of quantity being measured.  ii) Selectivity: It is the term to describe fulfillment of the requirements of measurement by an instrument to be suitable for use in a given situation. 

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Name the different torque and their function in measuring instrument.

Answer :

List of torques in analog instruments:  1. Deflecting torque  2. Controlling / restraining torque.  3. Damping torque.  1. Deflecting torque:  - To create deflection of pointer ... .  - Bring the pointer to standstill quickly.  - To minimize oscillations about final position. 

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List out any four effects of electric current used in measuring instruments & write name of meter working on it.

Answer :

Effects of Electric Current used in measuring instruments:  1. Magnetic Effect: PMMC and Moving Iron type Ammeters, voltmeter and Dynamometer type wattmeters etc.  2. Electromagnetic induction ... . Electrostatic effect: Voltmeters.  5. Hall Effect: Flux meter, Poynting vector wattmeter.

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What arc the errors occurring in measuring devices due to stray magnetic field and temp '? Explain how to compensate them.

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1. Error due to stray magnetic fields-   Main magnetic field gets disturbed by external magnetic fields known as stray magnetic fields.  2. Compensation technique   To avoid this error, ... resistance alloy having a negligible resistance temp coefficient in the ratio of 1:10 for pressure coil 

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Explain magnetic effect employed in measuring instrument.

Answer :

Magnetic Effect:  I) In PMMC meters:  ➢ When a current is passed through a conductor, magnetic field is produced round the conductor. Due to this field when current ... field it experiences a mechanical force.  Examples: Electrodynamometer type instruments, Induction type instrument. 

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Describe systematic errors in measuring instruments. 

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Systematic errors: -  ➢ Instrumental Error: These errors are caused due to the mechanical structure of measuring instrument.  a) Inherent shortcomings of instruments: Instrument may read ... or electrostatic fields.  ➢ Observational Error: Parallax errors, incorrect multiplying factor. 

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State the function of controlling torque in electrical measuring instrument.

Answer :

Function of controlling torque  1. The function is to opposes the deflection force and increases with the increase in the deflection of the moving system, to limit its movement. 2. and brought ... set a position where the two opposing forces i.e. deflection and controlling forces are equal. 

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Define: (i) Resolution, (ii) Calibration, with reference to electrical measuring systems.

Answer :

Resolution The smallest increment in input (the quantity being measured) which can be detected with certainty by an instrument is called its resolution or discrimination.  OR It is ... the measuring instrument with standard instrument to find out the error in the instrument under test.

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Why energy meter is integrating type measuring instrument?

Answer :

Energy Meter is Integrating Type Measuring Instrument: Energy meter is used for measurement of energy, which is obtained by integration (summation) of power supplied over the particular time duration, hence it the integrating type measuring instrument. 

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List any four effects employed in measuring instruments.

Answer :

Effects Employed in Measuring Instruments: 1. Magnetic Effect 2. Electromagnetic induction 3. Heating effect 4. Electrostatic effect 5. Hall Effect 

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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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Answer :

For measuring emf of a standard cell we use: Potentiometer

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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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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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In a transformer the resistance between its primary and secondary should be?

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In a transformer the resistance between its primary and secondary should be infinity.

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What should be the ideal resistance of ammeter ?

Answer :

Ideal resistance of ammeter should be zero.

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Answer :

Insulation resistance of high voltage circuit breakers is more than 100 mega ohms.

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For high value of diversity factor, a power station of given installed capacity will be in a position to supply more number of consumers.

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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

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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Answer :

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

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

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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Which of the following thyristors can be used for high frequency of operation? A) TRIAC B) DIAC C) SCR D) GTO 

Answer :

Which of the following thyristors can be used for high frequency of operation? A) TRIAC B) DIAC C) SCR D) GTO 

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Which capacitor is used for high frequency?

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Answer :

MOSFET provides better efficiency at high frequency and its high speed switching losses are less hence MOSFET is used for high frequency.

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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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Description :

Answer :

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

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

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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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