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For measurements on high voltage capacitors, the suitable bridge 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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Limitation and application of High Voltage DC (HVDC)

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Limitation and application of High Voltage DC (HVDC) :  Limitation:- 1) It is difficult to step up and step down DC voltage like AC voltage. 2) Special cooling ... conventional/non-conventional) 12) Increasing existing grid utilization. 13) Interconnection of different grids or networks

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Step-down transformer converts high voltage and low current into:  (A) How voltage and high current (B) High voltage and low current (C) Low voltage and high current (D) None of the above

Answer :

Step-down transformer converts high voltage and low current into: Low voltage and high current

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The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to extinguish the arc.

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Why is it cheaper to transmit electrical energy at high voltage?

Answer :

Because of the electrical energy was step upped by transformers the transformer have high efficiency than the electric energy is cheaper

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What is meant by extra high voltage transmission?

Answer :

HT & LT  two types transmission in industrial line 

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Why high voltage test is done?

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Why high voltage can reduce power loss?

Answer :

when voltage has increased due to reduced current flow, thus power loss given by ( I^2R) will be low due to reduced current(I^2) provided that resistance (R) is constant.

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What is Extra High Voltage?

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Why high voltage is used in power transmission?

Answer :

The primary reason that power is transmitted at high voltages is to increase efficiency. ... The lower current that accompanies high voltage transmissionreduces resistance in the conductors aselectricity flows ... This means that thin, light-weight wires can beused in long-distance transmission.

Description :

What are the advantages of high voltage transmission?

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 ... line increases  12. As transmission voltage increases power handling capacity of transmission line increases 

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What is a high voltage test?

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What is considered low voltage and high voltage?

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Answer :

yes High Voltage side of Transformer winding have more number of turns. and low voltage side of Transformer winding have less number of turns.

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Which capacitors are suitable for DC filter circuits?

Answer :

Electrolytic capacitors are suitable for DC filter circuits.

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Describe the need of level measurements.

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In almost all industries, vast quantities of liquid such as water ,solvents, chemicals etc. are used in number of processes. It is widely employed to monitor as well as measure ... and therefore its measurement becomes important in a variety of processes encountered in modern manufacturing plants.

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Gross errors occur in measurements because of (A) disturbances about which we are unaware. (B) human mistakes. (C) inherent shortcomings in the instrument. (D) loading effects on the meters.

Answer :

Gross errors occur in measurements because of human mistakes.

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

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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What is the charge on each capacitor when a 150 V is applied across two capacitors with values 5 μF and 10 μF, connected in series? A) 500 μC B) 0.5 μC C) 0.5 C D) None of these

Answer :

What is the charge on each capacitor when a 150 V is applied across two capacitors with values 5 μF and 10 μF, connected in series? A) 500 μC B) 0.5 μC C) 0.5 C D) None of these

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Answer :

Series capacitors on transmission lines are of little use when the load VAR requirement is small.

Description :

Capacitors for power factor correction are rated in?

Answer :

Capacitors for power factor correction are rated in kVAR.

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

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

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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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Capacitors

Answer :

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Why capacitors are used to improve power factor?

Answer :

 Capacitors generate reactive power instead of that drawn from source which is required by inductive loads.so it reduce the reactive current which is drawn from source to be drawn from capacitor.This control in Electric bills cost.

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State any four types of capacitors.

Answer :

Types of capacitors: i) Air capacitor ii) Paper capacitor iii) Mica capacitor iv) Ceramic capacitor v) Electrolytic capacitor vi) Poly-carbon capacitor

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The circuit has resistors, capacitors and semi-conductor diodes. The circuit will be known as

Answer :

The circuit has resistors, capacitors and semi-conductor diodes. The circuit will be known as non-linear circuit.

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The capacitors used in single-phase capacitor motors have no polarity marking.

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In a distribution system, in order to improve power factor, the synchronous capacitors are installed at the receiving end.

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Series capacitors are used to compensate for line inductive reactance.

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What are the different types of capacitors?

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Answer :

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

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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 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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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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Explain the principle of ON-OFF control and phase control of AC voltage controller with suitable circuit and waveforms.

Answer :

The integral cycle control (on-off control) and phase angle control are the two types of AC voltage controller. The principle of ON-OFF control: The on-off control is also called an integral cycle ... control. In phase control, the switch is on for some period of each cycle.  

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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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Draw full bridge & half bridge configuration with common cathode.

Answer :

Half Bridge Configuration: Full Bridge Configuration: 

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 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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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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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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Wheatstone bridge

Answer :

Wheatstone bridge

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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