asked
Jan 7, 2018
by
anonymous

**Description :** Define resistivity. State its unit.

**Last Answer :** Resistivity can be defined as the resistance of a conducting material per unit length with unit area of cross section. Its unit is ohm/meter

**Description :** Problems on resistance and resistivity

**Last Answer :** Problem on resistance and resistivity 1 : https://youtu.be/OqavD7OlZUs Problem on resistance and resistivity 2 : https://youtu.be/0eo8VO8cpwk Problem on resistance and resistivity 3 : https:// ... https://youtu.be/3neLRCTz0RQ Problem on resistance and resistivity 13 : https://youtu.be/vBCkvPOiztY

**Description :** Problem on resistance and resistivity 13

**Last Answer :** Problem on resistance and resistivity 13

**Description :** Problem on resistance and resistivity 12

**Last Answer :** Problem on resistance and resistivity 12

**Description :** Problem on resistance and resistivity 11

**Last Answer :** Problem on resistance and resistivity 11

**Description :** Problem on resistance and resistivity 10

**Last Answer :** Problem on resistance and resistivity 10

**Description :** Problem on resistance and resistivity 9

**Last Answer :** Problem on resistance and resistivity 9

**Description :** Problem on resistance and resistivity 8

**Last Answer :** Problem on resistance and resistivity 8

**Description :** Problem on resistance and resistivity 7

**Last Answer :** Problem on resistance and resistivity 7

**Description :** Problem on resistance and resistivity 6

**Last Answer :** Problem on resistance and resistivity 6

**Description :** Problem on resistance and resistivity 5

**Last Answer :** Problem on resistance and resistivity 5

**Description :** Problem on resistance and resistivity 4

**Last Answer :** Problem on resistance and resistivity 4

**Description :** Problem on resistance and resistivity 3

**Last Answer :** Problem on resistance and resistivity 3

**Description :** Problem on resistance and resistivity 2

**Last Answer :** Problem on resistance and resistivity 2

**Description :** Problem on resistance and resistivity 1

**Last Answer :** Problem on resistance and resistivity 1

**Description :** Which material has low resistivity?

**Last Answer :** Silver have lowest resistivity then copper then aluminium tungsten then iron...

**Description :** What is the formula for resistivity?

**Last Answer :** Resitivity is the property of a material. It is given in ρ . R=ρ L/A is the formula. where , Resitance is directly proportional to Length & Inversely proportional to Area of ... the resistance offered by a conductor to the flow of current is called specific resistance or resistivity.

**Description :** What is the reciprocal of resistivity?

**Last Answer :** conductivity, mho

**Description :** resistivity of wire depend on?

**Last Answer :** Resitivity of wire depends on material, electrical resistance of that material, area of cross section and length.

**Description :** what are the main factors that affect grinding and polishing process? automatic pressure grinding and polishing machine

**Description :** State the various factors governing selection of site for TPS.

**Last Answer :** Following various factors governing selection of site for TPS.:- 1. It should locate near coal mines. 2. Sufficient quantity of water should be available. 3. Sufficient large space should ... availalbe nearly. To the extent possible, the thermal station should be far away from an aerodrome

**Description :** State any four factors for selection of hydro power plant site.

**Last Answer :** Following Factors to be kept while site selecting for Hydro power plant: 1) Quantity of water available :-Where high rainfall occures so that sufficent quantity of water can be stored for generation of ... be possible to divert the stream. 11. Sand, gravel, etc., should be available nearby.

**Description :** State any four factors for selection of site of wind power plant.

**Last Answer :** The Factors for selection of site for Wind Mills: 1) The site should be selected where winds are strong i.e. where pressure of wind is high and there is continuity (14.4- 16.2 km/h) ... 50m of the turbine which can affect the system's overall performance 10)Possibility to connect to power grid.

**Description :** State any four factors for selecting location of nuclear power plant.

**Last Answer :** i) Seismicity: If the area of a nuclear site is seismically active, it may not be used for nuclear power plant. ii) Water Availability: The nuclear power plants would need a ... Therefore, the site selected for such plant should have adequate arrangement for the disposal of radioactive waste.

**Description :** State any four factors governing Selection of site for thermal power station.

**Last Answer :** Following Factors are to be considered:- 1. It should locate near coal mine. 2. Sufficient quantity of water should be available. 3. Sufficient large space should be available. 4. It should be located ... laws of the land and the town planning. 14. The interests of national defense must be served.

**Description :** Write any two factors on which earth resistance depends.

**Last 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

**Description :** State the factors affecting hysteresis loss.

**Last Answer :** i) Flux density ii) Frequency iii) Volume of the magnetic material iv) Nature of magnetic material

**Description :** List out factors affecting proximity effect.

**Last Answer :** Factors affecting proximity effect: 1. Conductor size (diameter of conductor) 2. Frequency of supply current. 3. Distance between conductors. 4. Permeability of conductor material

**Description :** State factors affecting the life of insulating materials.

**Description :** State and explain any four factors governing selection of induction motor.

**Last Answer :** The factors governing the selection of Induction motor: 1) Load torque required at normal speed matches with available torque of motor. 2) Break down torque or pull out torque or maximum torque ... If selecting energy efficient motor the cost benefit analysis over the long run must be worked out.

**Description :** State two factors deciding size of conduit.

**Last Answer :** Following factors deciding size of conduit: 1) Types of wiring method 2) No. of wires carried out through conduit 3) Size of wires required for sub circuits which is carried out through conduit 4) Future expansion.

**Description :** The main disadvantages of having poor power factors are: (A) High cost of station and distribution equipment (B) Poor voltage regulation (C) High energy loss in conductor (D) All of the above

**Last Answer :** The main disadvantages of having poor power factors are: (A) High cost of station and distribution equipment (B) Poor voltage regulation (C) High energy loss in conductor (D) All of the above

**Description :** What are the factors influencing measurement errors?

**Last Answer :** The factor influencing measurement errors are accuracy, precision, range and bandwidth, sensitivity, resolution and uncertainty.

**Description :** The Semiconductor strain gauges typically have much higher gauge factors than those of metallic strain gauges, primarily due to : (A) higher temperature sensitivity (B) higher Poisson’s ratio (C) higher piezoresitive coefficient (D) higher magnetostrictive coefficient

**Last Answer :** The Semiconductor strain gauges typically have much higher gauge factors than those of metallic strain gauges, primarily due to : higher piezoresitive coefficient

**Description :** Define – resistance and resistivity. State relationship between them. Give one material having high resistivity.

**Last Answer :** Ans: Resistance and Resistivity: Resistance: It is the opposition offered by the conductor to the flow of current. Resistivity: It is property of the substance by virtue of which it opposes to ... high resistivity: Mica, Nichrom, Rubber, Glass, Plastic Porcelain, Dry wood, Insulating material etc.

**Description :** What is the correct sequence of the following materials in ascending order of their resistivity ? 1. Iron 2. Silver 3. Constantan 4. Mica 5. Aluminium Select the correct answer using the codes given below : (a) 2, 5, 1, 3 ... 5, 3, 1 and 2 (c) 2, 3, 1, 5 and 4 (d) 4, 5, 1, 3 and 2

**Last Answer :** What is the correct sequence of the following materials in ascending order of their resistivity ? 1. Iron 2. Silver 3. Constantan 4. Mica 5. Aluminium Select the correct answer using the codes given below : ... 1 and 2 (c) 2, 3, 1, 5 and 4 (d) 4, 5, 1, 3 and 2

**Description :** Materials, whose resistivity at very low temperatures plunges from a finite value to zero and remains there upon further cooling, are known as

**Last Answer :** Materials, whose resistivity at very low temperatures plunges from a finite value to zero and remains there upon further cooling, are known as Superconductors

**Description :** The resistivity of a semiconductor material increases as : (A) The temperature increases (B) The temperature decreases (C) The temperature remains constant (D) None of the above

**Description :** Which material is having highest resistivity in ohm-metre at 20oC X10-8? A. Mercury B. Iron C. Tungsten D. Silver

**Last Answer :** Mercury material is having highest resistivity in ohm-metre at 20oC X10-8

**Description :** The resistance of a strip of copper of rectangular cross-section is 2Ω. A metal of resistivity twice that of copper is coated on its upper surface to a thickness equal to that of copper strip. The resistance of composite strip will be

**Last Answer :** The resistance of a strip of copper of rectangular cross-section is 2Ω. A metal of resistivity twice that of copper is coated on its upper surface to a thickness equal to that of copper strip. The resistance of composite strip will be 4/3Ω.