Torque to weight ratio of indicating instrument

 

in this video I will explain you
1. what is Torque to weight ratio
2. how torque to weight ratio indicate the performance of the instrument
3. minimum value of torque is to weight ratio
4. what is the significance of torque is to weight ratio
5.torque to weight ratio tell us about the sensitivity of the instrument
6. what is the order of torque to weight ratio for sensitive instrument
7. which instrument has highest value of torque is to weight ratio
8. which instrument has lowest value of torque is to weight ratio

Creeping in energy metre

 

in this video I will explain you
1. creeping in energy metre
2. why creeping happened energy metre
3. why potential coil of energy metre be always energized
4. major causes of creeping
5. method of prevention of creeping

question- two holes are drilled in the disc of an diameter of energy metre too

Wien bridge

 

in this video I will explain you

1.wien's Bridge and its use in frequency measurement
2. diagram of wien Bridge
3. in which range wien Bridge calculate frequency
4. why filter is used with null detector
5. working of wien  Bridge

question-which of the following bridges is generally used for the measurement of frequency and capacitance?

Schering bridge

 

in this video I will explain you about

1.the schering bridge
2. phasor diagram of schering bridge
3.dissipation factor in schering bridge

How to make attenuator gain independent of frequency

 

in this video I will explain you

1. what is attenuator 

2.how attenuator is Different from amplifiers 

3.how attenuator gain can be made independent of frequency 

and a numerical based on it

question-an attenuator probe is connected to an amplifier of input capacitance 0.1 microfarad value of C that must be connected across 100 kilo ohm to make the overall gain independent of Frequency 

Power consumed by wattmeter when CT and PT ratio is given

in this video I will explain you
1. how to calculate power measured by wattmeter when CT and PT ratio are given

question- wattmeter is marked 15 /30 ampere and 300 /600 volt and its scale is marked up to 4500 watts when the metre is connected for 30 ampere 600 volt the point indicated 2000watts the actual power in the circuit is

Partial discharge in High Voltage cables

 

in this video I will explain you
1. partial discharge in High Voltage cables
2. how partial discharge occur between conductor
3. reason of partial discharge in insulating material

question- the small packets of air in the high voltage cable provide – relative permittivity – electric field and at the sides breakdown is likely to be initiated

Condition and potential divider circuit is independent of frequency

 

in this video I will explain you
1. compensation from frequency and voltage divider
2. how RC voltage divider circuit work at low frequency and high frequency
3. condition at which potential divider is independent of frequency

Measurement of power factor by two wattmeter method

 

in this video I will explain you
how to measure power factor in three phase system using two wattmeter method when the load is balanced
  
question- in the measurement of power in a balanced 3 phase circuit by two wattmeter method if the two wattmeter show equal reading then the power factor of the circuit is

What is burden in CT?WHY LOAD ON CT IS CALLED BURDEN?BURDEN IS EXPRESSED IN

 

in this video I will explain you
1. what is burden in CT?
2. why load on CT is called burden?
3.why burden is in VA?

How the speed of disc rotation can be e decrease by changing the position of brake magnet in energy metre

 

in this video I will explain you
1. how is speed of disc rotation of energy metre can be controlled by changing the position of permanent magnet
2. how is speed of disc rotation vary with distance of of magnet from the spindle

numerical question- in an induction type metre everything else remain same if the radial distance of the brake magnet poles from the spindle is decreased by 10% the rotational speed of the disc will approximately

Braking system in energy metre and braking torque expression

 

in this video I will explain you
1. Braking System of energy metre
2.expression of braking torque in energy metre

Calibration of wattmeter by phantom loading

 

in this video I will explain you
1. calibration of wattmeter by direct loading
2. calibration of wattmeter by Phantom loading
3. why direct loading is not done with high rating wattmeter
4. how direct loading is different from Phantom loading
5. what is phantom loading

question- water metre is being tested under Phantom loading condition if the wattmeter reading is 60 what the actual power consumed from the supply

question- in Phantom loading arrangement energy consumption in the calibration test of wattmeter is reduced because of

Compensating coil in dynamometer type wattmeter

 

in this video I will explain you
1.role of compensating coil in dynamometer type wattmeter
2. number of turns in compensating
3. connection of compensating coil with pressure coil

FRinging effect in capacitor

 

in this video I will explain you
1. what is fringing effect in capacitor
2. what is edge effect in capacitor
3. what is the reason for fringing effect
4. validity of capacitance formula
5. effect of fringing on capacitance value
6. use of guard rings to eliminate fringing effect
7. potential of guard rings with respect to electrodes

question-guard electrode are used in capacitance measurement to minimise

Capacitor construction and working

 

in this video I will explain you
1. what is capacitor
2. what is the energy storing capacity of capacitor
3. capacitor construction
4. capacitance formula
5. working of capacitor
6. role of dielectric in capacitor
7. charging and discharging action of capacitor

What are transfer instrument

 

in this video I will explain you
1. why electrodynamometer type instrument considered as transfer instrument
2. what is transfer instrument
3. what are laboratory type wattmeter
4. use of transfer type instrument in calibration

What is calibration

 

in this video I will explain you
1. what is calibration of measuring instrument
2. what is calibrator
3. process of calibration
4. why calibration is necessary for measuring instrument
5. best method of calibration

Potential Transformer construction details

 

in this video I will explain you
1. construction detail of potential transformer
2. conductor and core size in potential transformer
3. why large conductor size and large core size are used in potential transformer
4. why special type of core are used in potential transformer
5. magnetising current in potential transformer
6. flux density in potential transformer
7. which type of core is used in high voltage and low voltage potential transformer
8. which type of winding is used in potential transformer

#potentialtransformer
#constructionofpotentialtransformer
#instrumenttransformer
#kip

Potential transformer

 

in this video I will explain you
1. what is potential transformer and its use
2. potential transformer is voltage step down transformer
3. how is connected across the load
4. potential transformer is active or passive device
5. is frequency change in potential transformer
6. voltmeter rating and potential transformer
7. number of turns in primary side and secondary side of potential transformer
8. potential Transformer can be used as three phase or single phase
9. secondary side voltage rating of potential transformer
10. potential Transformer behaviour as ordinary two winding Transformer operating and no load
11. volt ampere rating of potential transformer
12. transformation ratio in potential transformer
13. how to calculate primary side voltage in potential transformer

Instrument transformer

 

Why Shunt Is Not Used To Increase The Range Of Ammeter In Ac Circuit

 

Hay Bridge for measurement of inductance

 How hay Bridge is different from Maxwell Bridge

What is pulse width modulation?

 Pwm signal RMS value

Pwm signal average value

Pwm signal form factor

How to generate pwm signal

Spring control system in indicating instrument

 In indicating instruments the spring are mainly used to

Trick to remember value of temperature coefficient of resistance of different material

 Resistance temperature coefficient of copper at 20 degree celsius is

Null type instrument

 Question- which of the following does not employ a null method of measurement

Potentiometer method for measuring low resistance

 During the measurement of low resistance using a potentiometer the following reading were obtained voltage drop across unknown resistance = 2.531 volt voltage drop across 0.12 Om standard resistance connected in series with the unknown resistance equals to 1.083 volt value of the unknown resistor is

A potentiometer is used to measure the voltage between two points of a DC current which is found to be 1.2 volt this is also measured by a voltmeter which is found to be 0.9 volt the resistance of the voltmeter is 60 kilo ohm the input resistance between two points

 

Hysteresis Curve

 

Ballistic galvanometer

 

Sensitivity of voltmeter and ammeter

 

Trick to remember resistivity of Different materials

 

What is glare and how it caused

 

Insulation resistance in wire

 

Temperature coefficient of resistance

 

Role of compensating coil in megger

 

Effect of decrease in magnet strength on megger

 

Swamping Resistance || Why It Is Used With Ammeter|

 

Gravity control in measuring instruments

 

Why voltmeter and ammeter are connected in series and what is there internal resistance

 

Megger or mega ohm meter working,construction and principle

 

How to increase the range of ammeter using shunt resistance

 

Why scale of moving iron instrument is non uniform

 

Energy meter working

 

Dynamometer type Wattmeter construction, working principle

 

What will happen if one of resistance of balanced star connected systems get disconnected

 

How to calculate average value of alternating voltage and current

 

What happens if neutal of the 3 phase 4 wire supply system get breaks ?

 

In a 3 phase 400v ,4 4wire system two incandesent lamps one having 230v,100w specification and the other 230v,200w are connected b/w r phase neutral and y phase neutral respectively 

If the neutral wire breaks (ssc je 2013)

In the circuit ,v is the input voltage applied across the capacitor of 2F .current through the capacitor is

 In the circuit ,v is the input voltage applied across the capacitor of 2F .current through the capacitor is

Network analysis questions asked in ssc je

 

Total power in series and parallel connections

 

Possible connections between three different resistance

 

Circuit analysis questions asked in ssc je

 

Maximum power transfer theorem in ac circuit

 

Power and energy conceptual numerical

 

Current Division rule with numerical

 

Kvl and current Division rule with network analysis questions

 

Which bulb will glow Brighter in series connection

 

Power indicated by Wattmeter

 

Admittance, susceptance and impedance in ac circuit

 

How to calculate total current in parallel lcr circuit

 

Steady state condition in inductor and capacitor

 

Relation between time constant and number of turn in inductor

 

Relation between mutual inductance and number of Turns

 

Resonanc in series rlc circuit

 

Quality factor and bandwidth of series lcr circuit

 

Balanced and unbalanced three phase system

 

Reactive power measurement by one Wattmeter method and blondel's theorem

 

Form factor, rms value and average value

 

Function of starter in tubelight

 

Function of starter and choke in tubelight

 

Relation between time period and frequency