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

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Answer :

For measurement of mutual inductance we can use Heaviside bridge.

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Describe with working of LCR meter for measurement of inductance. 

Answer :

working of LCR:- A LCR meter (Inductance (L), Capacitance (C), and Resistance (R) test equipment used to measure the inductance, capacitance and, resistance of a component. It works on the ... in parallel (as would be encountered in measuring a capacitor with a leaky dielectric) [Q setting ] 

Description :

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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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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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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The bridge method commonly used for finding mutual inductance is (A) Heaviside Campbell bridge (B) Schering bridge (C) De Sauty bridge (D) Wien bridge

Answer :

The bridge method commonly used for finding mutual inductance is Heaviside Campbell bridge

Description :

For measurement of radio frequency ac signals __________ type meter is used

Answer :

For measurement of radio frequency ac signals thermo-couple type meter is used

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When both the inductance and resistance of a coil are doubled the value of?

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When both the inductance and resistance of a coil are doubled the value of time constant remains unchanged.

Description :

The self inductance of a coil can be measured using (A) Wien’s Bridge (B) Schering Bridge (C) Anderson’s Bridge (D) Wheatstone Bridge

Answer :

The self inductance of a coil can be measured using Anderson’s Bridge

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Answer :

If an inductance is connected in one arm of bridge and resistances in the remaining three arms the bridge cannot be balanced.

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Answer :

In an Anderson bridge, the unknown inductance is measured in terms of known capacitance and resistance.

Description :

Measurement of a non -electrical quantity involves the following four subsystems:  a) amplifier block b) display block c) instrumentation block d) transducer block  The correct, sequence in which these block occur is  (1) d,a,c,b (2) d, c, a, b (3) a, c, b, d (4) a, b, c, d

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Measurement of a non -electrical quantity involves the following four subsystems:  a) amplifier block b) display block c) instrumentation block d) transducer block  The correct, sequence in which these block occur is d,a,c,b

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Accurate measurement of very low resistances is possible with (A) Megger (B) Wheatstone Bridge (C) Kelvin’s Double Bridge (D) Wagner’s Earthing Device

Answer :

Accurate measurement of very low resistances is possible with Kelvin’s Double Bridge

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Answer :

Commonly used instruments in power system measurement are induction.

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In a 3-phase power measurement by two wattmeter method, both the watt meters had identical readings. The power factor of the load was?

Answer :

In a 3-phase power measurement by two wattmeter method, both the watt meters had identical readings. The power factor of the load was unity.

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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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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?

Answer :

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

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Answer :

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

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The equation of 50 Hz current sine wave having r.m.s. value of 60 A is?

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(60*√2)Sin(2π*50*t)

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Answer :

The value of co-efficient of adhesion will be high when rails are cleaned with sand.

Description :

For 11kV line the inductance per km per phase will be of the order of:  (A) 1 H (B) 0.1 H (C) 1 mH (D) 0.1 mH

Answer :

For 11kV line the inductance per km per phase will be of the order of: 1 mH

Description :

True value has been 50 whereas measured value is 40 then the percentage error in the reading will be ______.  (A) 20% (B) 40% (C) 50% (D) 30%

Answer :

True value has been 50 whereas measured value is 40 then the percentage error in the reading will be 20%. 

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Draw Bourdon tube with LVDT setup for pressure measurement.

Answer :

Bourdon tube with LVDT setup for pressure measurement.

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The bridge most suited for accurate measurement of relative permittivity of dielectric materials is (A) Carey Foster Bridge (B) Anderson’s bridge (C) Heaviside Bridge modified by Campbell. (D) Schering Bridge.

Answer :

The bridge most suited for accurate measurement of relative permittivity of dielectric materials is Schering Bridge.

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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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Answer :

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

Description :

State the impact of inductance and resistance on transmission line performance

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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Answer :

Inductance

Description :

effect of inductance and capacitance on performance of transmission line.

Answer :

Following are the effect on performance of transmission line:  1. Due to inductance (L) voltage drop in transmission line produces.  2. Capacitor (C) draws charging current ... , transmission line efficiency, voltage regulation & also power factor of transmission line gets affected. 

Description :

What is inductance?

Answer :

Inductance is the property of Material by which it opposes the any change of magnitude or direction of electric current passing through the conductor. The inductance is denoted by L. The unit of inductance is Henry (H).

Description :

Self inductance formula

Answer :

Self inductance formula

Description :

Self induced voltage across an inductance

Answer :

Self induced voltage across an inductance

Description :

lt the length, number of turns and area of a coil are  doubled, the inductance of the coil

Answer :

lt the length, number of turns and area of a coil are  doubled, the inductance of the coil is quadrupled

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The initial rate of rise of current through a coil of inductance 10 H when suddenly connected to a D.C. supply of 200 V is_______Vs.

Answer :

The initial rate of rise of current through a coil of inductance 10 H when suddenly connected to a D.C. supply of 200 V is 20 Vs

Description :

The inductance of a coil can be increased by?

Answer :

The inductance of a coil can be increased by choosing core material having high relative permeability.

Description :

Inductance of coil?

Answer :

Inductance of coil increases with the increase in supply frequency.

Description :

Inductance of a coil Varies?

Answer :

Inductance of a coil Varies as directly as the cross-sectional area of magnetic core and inversely as the length of the iron path.

Description :

Inductance affects the direct current flow?

Answer :

Inductance affects the direct current flow at the time of turning on and off.

Description :

What is the reciprocal of inductance?

Answer :

This term is not exist

Description :

Answer :

Unit of inductance is Henry denoted by capital H .

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List the different level measurement methods. 

Answer :

Liquid Level Measurement Direct method 1. Hook type 2. Sight glass gype 3. Float type 4. Dip stick Indirect method 1. Hydraustatic pressure type 2. Electrical type a) Capacitance level indicator b) Radiation level detector c) Ultrasonic level gauge 3. Radar type

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sketch time period measurement by CRO.

Answer :

Horizontal sweep is turned ON and the display appealing on the screen is adjusted by varying different control knobs provided on the front panel of CRO, till the signal is suitably displayed ... Where m=Number of division in one complete cycle n=Setting of time base =Time/Division

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different types of errors occurs in measurement.

Answer :

Generally errors are classified into three types: systematic errors, random errors and blunders. 1) Gross Errors 2) Random Errors 3) Systematic Errors Instrumental Errors Environmental ... to wrong observations or reading in the instruments particularly in case of energy meter reading. 

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tern null as it applies to bridge measurement.

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Null measurements balance voltages so that there is no current flowing through the measuring device and, therefore, no alteration of the circuit being measured. Null measurements are generally more ... the use of standard voltmeters and ammeters, and they still have limits to their precision.

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State how pressure measurement can be done using Dead weight tester.

Answer :

The handle is fully drawn out and the oil is allowed to enter in the cylinder (i.e. gauge and piston) The weight to be measured is placed on the platform. Now the handle is turned ... of the area of the piston and the pressure indicated on the gauge is equal to the weight under measurement.

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Define measurement and state the significance of electrical measurement system.

Answer :

Measurement: Measurement is essentially a process in which magnitude of a quantity is determined in comparison with another similar quantity with significant units. OR The measurement of a given ... x) The measurement conforms the validity of hypothesis and also adds to its understanding.

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State the significance of term measurement. 

Answer :

Measurement is the quantitative comparison between unknown quantities with known standard. For doing this process there is need of physical device, called as measuring instrument. The measurement confirms the validity of the hypothesis and also adds to its understanding.

Description :

Explain significance and purpose of electrical measurement system.

Answer :

➢ Significance of Electrical Measurement System  1. The measurement is required for measurement of all physical quantities for e.g speed, velocity, temperature, pressure etc.  2. All electrical ... 4. These standards and references may changes time to time, area to area person to person 

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