The measurement of dielectric loss and power factor is done using...

The measurement of dielectric loss and power factor is done using 

(A) Weins Bridge (B) Hays Bridge (C) Schering Bridge (D) Wheat Stone Bridge 
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1 Answer

Answer :

C Schering brigde
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Related questions

In dielectric measurement, the dielectric loss is proportional to a) F b) V c) I d) Vsqr

Description : In dielectric measurement, the dielectric loss is proportional to a) F b) V c) I d) Vsqr

Last Answer : Ans: Vsqr

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Description : The power factor of dielectric :  (A) is a function of temperature of the dielectric only (B) depends only on voltage stress to which the dielectric is stressed (C) always constant (D) both (A) and (B)

Last Answer : The power factor of dielectric :  (A) is a function of temperature of the dielectric only (B) depends only on voltage stress to which the dielectric is stressed (C) always constant (D) both (A) and (B)

Compute the loss factor when the loss tangent is 0.88 and the real part of dielectric is 24. a) 12.12 b) 12.21 c) 21.21 d) 21.12

Description : Compute the loss factor when the loss tangent is 0.88 and the real part of dielectric is 24. a) 12.12 b) 12.21 c) 21.21 d) 21.12

Last Answer : d) 21.12

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

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.

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

For an insulating material, dielectric strength and dielectric loss should be respectively

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With the help of which bridge are the capacitance and dielectric loss of a capacitor generally measured ?

Description : With the help of which bridge are the capacitance and dielectric loss of a capacitor generally measured ?

Last Answer : With the help of Schering bridge are the capacitance and dielectric loss of a capacitor generally measured.

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

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

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The loss tangent refers to the a) Power due to propagation in conductor to that in dielectric b) Power loss c) Current loss d) Charge loss

Description : The loss tangent refers to the a) Power due to propagation in conductor to that in dielectric b) Power loss c) Current loss d) Charge loss

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Draw and explain the circuit diagram for measurement of single phase power using dynamometer type wattmeter.

Description : Draw and explain the circuit diagram for measurement of single phase power using dynamometer type wattmeter. 

Last Answer : Circuit diagram for measurement of single phase power using dynamometer type wattmeter: Explanation: It consists of two stationary coils, called current coils and one moving coil, called voltage or ... i.e. power. The meter can be calibrated directly to indicate the power in watts. 

The ratio of speed of light in air to the speed of light in another substance is called the a. Speed factor b. Index of reflection c. Index of refraction d. Dielectric constant

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Referred to the dielectric constant of a transmission line material. A. Inductance and capacitance B. Velocity factor C. Characteristic impedance D. Propagation velocity

Description : Referred to the dielectric constant of a transmission line material. A. Inductance and capacitance B. Velocity factor C. Characteristic impedance D. Propagation velocity

Last Answer : B. Velocity factor

What is the velocity factor for non-foam dielectric 50 or 75 ohm flexible coaxial cable such as RG 8, 11, 58 and 59? A. 2.70 B. 0.10 C. 0.66 D. 0.30

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Last Answer : C. 0.66

The ratio of speed of light in air to the speed of light in another substance is called the ∙ a. Speed factor ∙ b. Index of reflection ∙ c. Index of refraction ∙ d. Dielectric constant

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Last Answer : b. Index of reflection

The loss tangent of a perfect dielectric will be a) Zero b) Unity c) Maximum d) Minimum

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Choose the best definition of dielectric loss. a) Absorption of electric energy by dielectric in an AC field b) Dissipation of electric energy by dielectric in a static field c) Dissipation of heat by dielectric d) Product of loss tangent and relative permittivity

Description : Choose the best definition of dielectric loss. a) Absorption of electric energy by dielectric in an AC field b) Dissipation of electric energy by dielectric in a static field c) Dissipation of heat by dielectric d) Product of loss tangent and relative permittivity

Last Answer : a) Absorption of electric energy by dielectric in an AC field

When a dielectric loses its dielectric property, the phenomenon is called a) Dielectric loss b) Dielectric breakdown c) Polarisation d) Magnetization

Description : When a dielectric loses its dielectric property, the phenomenon is called a) Dielectric loss b) Dielectric breakdown c) Polarisation d) Magnetization

Last Answer : b) Dielectric breakdown

Calculate the loss tangent when the dielectric constant in AC field is given by 3 + 2j. a) (2/3) b) (3/2) c) (-3/2) d) (-2/3)

Description : Calculate the loss tangent when the dielectric constant in AC field is given by 3 + 2j. a) (2/3) b) (3/2) c) (-3/2) d) (-2/3)

Last Answer : d) (-2/3)

If the loss tangent is very less, then the material will be a a) Conductor b) Lossless dielectric c) Lossy dielectric d) Insulator

Description : If the loss tangent is very less, then the material will be a a) Conductor b) Lossless dielectric c) Lossy dielectric d) Insulator

Last Answer : b) Lossless dielectric

The ratio of conduction to displacement current density is referred to as a) Attenuation constant b) Propagation constant c) Loss tangent d) Dielectric constant

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The current carrying capacity of cables in D.C. is more that in A.C. mainly due to (a) absence of harmonics (b) non-existence of any stability limit (c) smaller dielectric loss (d) absence of ripples (e) none of the above

Description : The current carrying capacity of cables in D.C. is more that in A.C. mainly due to (a) absence of harmonics (b) non-existence of any stability limit (c) smaller dielectric loss (d) absence of ripples (e) none of the above

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The bridge used to measure the dielectric loss of an insulator is:

Description : The bridge used to measure the dielectric loss of an insulator is: A) Anderson bridge B) Wien’s bridge C) Schering bridge D) Any of the above

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Dielectric loss in a capacitor is best measured by

Description : Dielectric loss in a capacitor is best measured by (A) Wien Bridge (B) Schering Bridge (C) Anderson Bridge (D) Heaviside-Campbell Equal Ratio Bridge

Last Answer : Dielectric loss in a capacitor is best measured by Schering Bridge

The dielectric loss of capacitance can be measured by

Last Answer : The dielectric loss of capacitance can be measured by Schering bridge.

Which of the following tests is not done for transformer oil? (A) Flash point and acid value (B) Aniline point (C) Dielectric strength (D) Copper strip corrosion test

Description : Which of the following tests is not done for transformer oil? (A) Flash point and acid value (B) Aniline point (C) Dielectric strength (D) Copper strip corrosion test

Last Answer : (B) Aniline poin

Measurement of high dc-voltages is usually done by using

Description : Measurement of high dc-voltages is usually done by using

Last Answer : electrostatic

Measurement of high dc-voltages is usually done by using

Description : Measurement of high dc-voltages is usually done by using

Last Answer : electrostatic

What is the Measurement of power energy power factor?

Description : What is the Measurement of power energy power factor?

Last Answer : Power - Watt. Energy - Watt Hour. Power factor - no unit. justnumber less than or equal to 1.

In order to increase its range of measurement, a resistance would be placed in series with which of the following instruments? A. DC voltmeter B. DC ammeter C. frequency meter D. power factor meter

Description : In order to increase its range of measurement, a resistance would be placed in series with which of the following instruments? A. DC voltmeter B. DC ammeter C. frequency meter D. power factor meter

Last Answer : Answer: A

The two watt meters measurement the ratio of two meter readings is –(1-sqrt3):( 1+sqrt3) then the power factor is a) 1 b) 0.866 c) 0.707 d) 0

Description : The two watt meters measurement the ratio of two meter readings is –(1-sqrt3):( 1+sqrt3) then the power factor is a) 1 b) 0.866 c) 0.707 d) 0

Last Answer : Ans: 0.707

Explain the effect of power factor on wattmeter reading in two wattmeter method for power measurement.

Description : Explain the effect of power factor on wattmeter reading in two wattmeter method for power measurement.

Last Answer : Effect of P.F. on Reading of Wattmeter in Two Wattmeter Method:

For power measurement of three phase circuit by two wattmeter method, when the value of power factor

Description : For power measurement of three phase circuit by two wattmeter method, when the value of power factor is less than 0.5 lagging:

Last Answer : For power measurement of three phase circuit by two wattmeter method, when the value of power factor is less than 0.5 lagging: One of the wattmeter connections will have to be reversed

Measurement of power and power factor of a 3-phase system by two wattmeter method can be

Description : Measurement of power and power factor of a 3-phase system by two wattmeter method can be obtained in case of  1. Balanced load and balanced source  2. Balanced source with 3-phase 3-wire unbalanced load  3. Unbalanced source with 3-phase 3 ... b) 2, 3 and 5 (c) 1, 2, 3, 4 and 5 (d) 1, 2, 3 and 5 

Last Answer : Measurement of power and power factor of a 3-phase system by two wattmeter method can be obtained in case of  1. Balanced load and balanced source  2. Balanced source with 3-phase 3-wire unbalanced load  3. Unbalanced source with 3- ... b) 2, 3 and 5 (c) 1, 2, 3, 4 and 5 (d) 1, 2, 3 and 5 

The power measurement in a balanced 3-phase circuit can be done by:

Last Answer : The power measurement in a balanced 3-phase circuit can be done by: One wattmeter method, Two wattmeter method, Three wattmeter method.

State failure phenomena observed in insulating material. State four reasons for failure of gaseous and solid dielectric materials.

Description : State failure phenomena observed in insulating material. State four reasons for failure of gaseous and solid dielectric materials. 

Last Answer : Failure phenomena in insulating material means the dielectric property fails :  The dielectric failure mean the dielectric strength of insulating material reduces due to high voltages or high ... 6. Due to poor maintenance of insulating material there may be possibility dielectric failure 

Write one application for the give dielectric material. (i) Polyvinyl Carbide(PVC) (ii) Glass (iii) Mica (iv) Cotton and Silk

Description : Write one application for the give dielectric material. (i) Polyvinyl Carbide(PVC) (ii) Glass (iii) Mica (iv) Cotton and Silk

Last Answer : (i) Polyvinyl Carbide(PVC):it is used in insulation of wires and cables in domestic wiring as well as in aircraft and factory wiring (any one)  (ii) Glass: 1) Alkaline glasses are used for ... with wax or varnishes are used in windings of magnet coils and small medium sized mechanics (any one) 

State any four dielectric materials.

Description : State any four dielectric materials.

Last Answer : Ceramics, distilled water, paper, mica, polyethylene, and glass. Metal oxides

Define breakdown voltage and dielectric strength of a capacitor.

Description : Define breakdown voltage and dielectric strength of a capacitor.

Last Answer : Breakdown Voltage: The voltage at which the dielectric material breaks down (Starts conducting or is no longer remains as an insulator) for a specified thickness, is called its breakdown ... without breaking down (without losing its dielectric property) is called its dielectric strength. 

Define : (i) Dielectric strength (ii) Breakdown voltage

Description : Define : (i) Dielectric strength (ii) Breakdown voltage

Last Answer : (i) Dielectric strength: The voltage which a dielectric material can withstand without breaking down (without losing its dielectric property) is called its dielectric strength. It is represented by kV/mm ... or is no longer an insulator) for a specified thickness, is its breakdown voltage. 

What is dielectric strength of an insulating material? What is its unit?

Description : What is dielectric strength of an insulating material? What is its unit?

Last Answer : Dielectric Strength: The dielectric strength of an insulating material is the maximum voltage which the insulating medium can withstand without breakdown. Unit is volts per millimeter (V/mm), or kV/mm or kV/cm

Define dielectric strength for a capacitor.

Description : Define dielectric strength for a capacitor.

Last Answer : Ans: Di-electric Strength for a capacitor: The voltage which a dielectric material can withstand without breaking down (without losing its dielectric property) is called as dielectric strength.

Absorbed moisture contents affect the dielectric strength________.

Description : Absorbed moisture contents affect the dielectric strength________.

Last Answer : indirectly 

The presence of alkali oxides in alumino silicate ceramics is likely to result in dielectric breakdown due to

Description : The presence of alkali oxides in alumino silicate ceramics is likely to result in dielectric breakdown due to   (A) Polarization (B) Conductivity (C) Structural homogeneties (D) Ionization

Last Answer : The presence of alkali oxides in alumino silicate ceramics is likely to result in dielectric breakdown due to Conductivity 

The dielectric strength of impregnated papers is about

Description : The dielectric strength of impregnated papers is about   (a) 20 kV/mm (b) 30 kV/mm (c) 15 kV/mm (d) 5 kV/mm 

Last Answer : The dielectric strength of impregnated papers is about 30 kV/mm

The imaginary part of dielectric constant determines

Description : The imaginary part of dielectric constant determines (a) Component of current which is in phase with the applied field (b) Component of energy absorbed per m3 (c) Amount of applied field (d) Component of voltage which is in phase with the applied field

Last Answer : The imaginary part of dielectric constant determines Component of current which is in phase with the applied field

The depth of penetration of a wave in a lossy dielectric medium increases with

Description : The depth of penetration of a wave in a lossy dielectric medium increases with 

Last Answer : The depth of penetration of a wave in a lossy dielectric medium increases with Increasing wavelength

For making capacitors, it is better to select a dielectric having_________.

Description : For making capacitors, it is better to select a dielectric having_________.

Last Answer : For making capacitors, it is better to select a dielectric having high permittivity.

Voltage applied across a ceramic dielectric produces an electrostatic...

Description : Voltage applied across a ceramic dielectric produces an electrostatic field 100 times greater than in air. The dielectric constant? of the ceramic equals________. 

Last Answer : Voltage applied across a ceramic dielectric produces an electrostatic field 100 times greater than in air. The dielectric constant? of the ceramic equals 100.

When using a megohmmeter to test the dielectric strength of wire insulation, a continuous series of slight downscale kicks by the pointer is result of ____________. A. good insulation B. the leakage of current along the surface of dirty insulation C. the capacitance of the windings D. the dielectric-absorption effect of the insulation

Description : When using a megohmmeter to test the dielectric strength of wire insulation, a continuous series of slight downscale kicks by the pointer is result of ____________. A. good insulation B. the ... dirty insulation C. the capacitance of the windings D. the dielectric-absorption effect of the insulation

Last Answer : Answer: B

What is the impedance of a balance 4-wire with a diameter of 0.25 cm and spaced 2.5 cm apart using an insulator with a dielectric constant of 2.56? A. 100Ω B. 65Ω C. 75 Ω D. 50 Ω

Description : What is the impedance of a balance 4-wire with a diameter of 0.25 cm and spaced 2.5 cm apart using an insulator with a dielectric constant of 2.56? A. 100Ω B. 65Ω C. 75 Ω D. 50 Ω

Last Answer : A. 100Ω