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In a Schering bridge the potential of the detector above earth potential is a few volts only.

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Description :

Draw & explain operation of phase detector.

Answer :

In phase detector, the op-Amp basically acts as a zero crossing detector. If a sine wave is applied at the i/p, we get square wave at the op-Amp o/p (at point ... to two channel of the CRO. The time duration between the pulses corresponding to voltages represent the phase between them. 

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

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Explain why potential difference is necessary to produce current in a circuit.

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A dummy strain gage is used in a quarter bridge strain gage circuit to :  (A) compensate for changes in temperature and lead wire resistance  (B) produce more output voltage from the bridge  (C) increase the sensitivity of the bridge  (D) compensate lead wire resistance only

Answer :

A dummy strain gage is used in a quarter bridge strain gage circuit to : compensate for changes in temperature and lead wire resistance 

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Description :

The bridge most suited for measurement of a four-terminal resistance in the range of 0.001 Ohm to 0.1 Ohm (A) Wien’s bridge (B) Kelvin double bridge (C) Maxwell’s bridge (D) Shering Bridge

Answer :

The bridge most suited for measurement of a four-terminal resistance in the range of 0.001 Ohm to 0.1 Ohm (A) Wien’s bridge (B) Kelvin double bridge (C) Maxwell’s bridge (D) Shering 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.

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Description :

The potential coil of a single phase dynamometer wattmeter has 4840 Ohm resistance. Voltage across the load is 220 V. With the potential coil connected on the load side, the meter indicates 100 W. Approximate percentage error due to wattmeter connection is (A) 11% (B) 9% (C) 1.1% (D) 3%

Answer :

The potential coil of a single phase dynamometer wattmeter has 4840 Ohm resistance. Voltage across the load is 220 V. With the potential coil connected on the load side, the meter indicates 100 W. Approximate percentage error due to wattmeter connection is 11%

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Description :

A universal RLC bridge uses?

Answer :

A universal RLC bridge uses Maxwell Wein bridge for measurement of inductance and modified De Santy's bridge for measurement of capacitance.

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Description :

Is electric potential zero when electric field is zero?

Answer :

Yes  .If  electric  field  is  zero  then  electric  potential  is  zero  ,  not  even  one.

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Description :

What is the potential barrier of metal?

Answer :

Potential barrier of metal is zero.

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Description :

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

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Description :

Answer :

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

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A lightening arrester connected between the line and earth in a power system  (1) protects the terminal equipment against travelling surges (2) protects the transmission line against direct lightening strokes (3) suppresses high frequency oscillations in the line (4) reflects back the travelling wave approaching it

Answer :

A lightening arrester connected between the line and earth in a power system protects the terminal equipment against travelling surges

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Earth Tester Practical

Answer :

Practical Significance Earthing System or Grounding System is an electrical network work as a safety measure to protect human life as well as equipment. The main objective of the Earth testing is to ... than 5 Ohm, pour the water in funnel of earth electrode and measure the earth resistance.

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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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what is earth leakage?

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Sketch block diagram of satellite earth station and state functions of each block

Answer :

The figure below shows the general block diagram of an earth station capable of transmission, reception and antenna tracking. The following are the major subsystems of ... , possible monitoring of satellite characteristics and occasionally for the measurement of special characteristics. 

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State function of starter and ELCB. (Earth Leakage Circuit Breaker)

Answer :

i) Function of Starter:- 1. To prevent the high starting current OR to minimize the starting current. 2. To give supply failure protection 3. To give over load and short circuit protection ... an installation and cut off the circuit from power supply and avoid electrical shock to the person.

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Description :

State working principle of earth tester.

Answer :

Earth tester:-The resistance of the earth is measured with the help of earth tester. It consists of a hand cranked type generator, the magnet poles, crossed coils and flexible spirals. It consists ... deflection of the pointer will indicate directly resistance in ohm of the earth under test.

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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.

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.

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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Answer :

The inverse definite mean time relays are used for over current and earth fault protection of transformer against internal short-circuits.

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Description :

In a 230 V, 50 Hz single-phase SCR bridge converter operating at a firing delay angle, α and with large R-L load, the input source current is (A) sinusoidal current (B) constant dc current (C) continuous rectangular pulses (D) alternating rectangular pulses

Answer :

In a 230 V, 50 Hz single-phase SCR bridge converter operating at a firing delay angle, α and with large R-L load, the input source current is alternating rectangular pulses

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Give the operation of single phase full wave bridge controlled converter with RL load with a neat diagram. Also draw its waveform.

Answer :

Single phase fully control bridge converter with RL load: 1. During positive half cycle of input voltage, T1 and T2 are forward biased and during negative half cycle, T3 and T4 are forward biased. Therefore, T1-T2 ... cycle till the firing of next pair of SCRs as shown in the waveform.

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The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a firing delay angle, α and flux, Φ (A) directly proportional to α and Φ (B) inversely proportional to α and Φ (C) directly proportional to α and inversely proportional to Φ (D) directly proportional to Φ and inversely proportional to α

Answer :

The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a firing delay angle, α and flux, Φ directly proportional to α and inversely proportional to Φ

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Description :

A 230 V, 50 Hz phase controlled single-phase full-controlled SCR bridge converter draws 15 A constant dc current. If the source inductance is 3 mH, the drop in dc output voltage is (A) 4.5 V (B) 6.75 V (C) 9 V (D) 13.5 V

Answer :

A 230 V, 50 Hz phase controlled single-phase full-controlled SCR bridge converter draws 15 A constant dc current. If the source inductance is 3 mH, the drop in dc output voltage is 9 V

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Description :

Draw circuit diagram of symmetrical configuration of bridge converter.

Answer :

circuit diagram of symmetrical configuration of bridge converter

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List out advantages and disadvantages of bridge rectifier.

Answer :

Advantages :  1. Bridge rectifier can be used in applications allowing floating output terminals i.e. not output terminal is grounded.  2. The need of center-tapped transformer is eliminated.  ... The value of the diodes used should be precise , else there will be an error in rectification

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Description :

Draw full bridge & half bridge configuration with common cathode.

Answer :

Half Bridge Configuration: Full Bridge Configuration: 

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Description :

 operation of whetstone bridge. 

Answer :

A Wheatstone bridge is widely used to measure the electrical resistance. This circuit is built with two known resistors, one unknown resistor and one variable resistor connected in the form of bridge. ... using a Wheatstone Bridge the unknown electrical resistance value can easily measure.

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Description :

tern null as it applies to bridge measurement.

Answer :

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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Description :

Wheatstone bridge

Answer :

Wheatstone bridge

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Description :

Which of the following is true with respect to Wien Bridge? A) It does not require equal values of R or C  B) It requires that R and C values of all components must be equal C) It requires that all resistors should have equal values D) None of these

Answer :

Which of the following is true with respect to Wien Bridge? A) It does not require equal values of R or C  B) It requires that R and C values of all components must be equal C) It requires that all resistors should have equal values D) None of these

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Description :

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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Description :

Explain three phase bridge inverter.

Answer :

Three phase bridge inverter: Three phase bridge inverter converts DC voltage input to three-phase variable frequency variable voltage output. DC voltage source can be a DC source or output of the rectifier. ... in proper sequence. The switch may be thyristor or IGBT etc.

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Description :

Explain the operation of full bridge converters with their different operating modes. State its advantages and disadvantages.

Answer :

Full bridge converter: Full bridge converter provides isolation between input and output. Full bridge converter is used for step up or step down the input voltage. Full bridge converter consists of four power semiconductor ... Require filter on both input and output.

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Description :

explain blanking times for Bridge circuit?

Answer :

Blanking time is provided by driver circuit to power switch. Blanking time is important because the turn on input of one transistor must be delayed with turn off input of another transistor if both ... are connected in one converter leg. This blanking time helps in avoiding cross conduction.

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Description :

Schering bridge is used to measure  (1) Frequency (2) Inductance (3) Capacitance (4) Mutual Inductance

Answer :

3

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Description :

Answer :

For eliminating the effect of earth capacitance from the bridge network we use: Wagner’s earthing device

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Description :

In analysis of man-environment relationship Pragmatic Possibilism implies that : (A) There is no limit for man to exploit resources of earth (B) There are limited possibilities to explore earth's resources (C) The man has to watch and assess the situation and then go ahead with resource utilization (D) The man has to keep in mind only his basic needs while planning to harness the potential of resourceful earth 

Answer :

(C) The man has to watch and assess the situation and then go ahead with resource utilization

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Description :

In practice, Earth is chosen as a place of zero electric potential because it 

Answer :

In practice, Earth is chosen as a place of zero electric potential because it has almost constant potential

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Description :

Which of the following types of natural hazards have the highest potential to cause damage to humans? (A) Earth quakes (B) Forest fires (C) Volcanic eruptions (D) Droughts and Floods 

Answer :

(D) Droughts and Floods 

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Description :

Which of the following celestial bodies contains abundant quantities of helium-3, a potential source of energy ? (1) Earth (2) Moon (3) Venus (4) Saturn

Answer :

Moon

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Description :

Wagner's earth devices are used in AC bridge circuits for (a) Eliminating the effect of earth capacitances (b) Eliminating the effect of intercomponent capacitances (c) Eliminating the effect of stray electrostatic fields (d) Shielding the bridge elements

Answer :

Wagner's earth devices are used in AC bridge circuits for Eliminating the effect of earth capacitances

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Which of the following has no potential for occupational information? Options: A) Sharing activities in the elementary school B) The general class of a Junior high school C) A biology class in a senior high-school D) None of the above

Answer :

D) None of the above 

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Description :

Tides in the sea have stored in them : (1) Hydraulic energy (2) Kinetic energy (3) Gravitational potential energy (4) A combination of all the above three forms of energy

Answer :

Gravitational potential energy

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Description :

Velocity of an electron (in km/S) starting at rest and travelling to a point 100 V above the starting potential is around  A) 3600 B) 4000 C) 5100 D) 6000

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Answer :

The most commonly used null deflector in a power frequency ac bridge is a: Vibration galvanometer.

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Description :

The current coil of a wattmeter is connected to the C.T. of R phase. Its potential coil is connected across Y & B phases. The wattmeter measures (a) active power in R phase (b) active power of Y-phase (c) reactive power in R-phase (d) power proportional to 3-phase power if the load is balanced 

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