0 views

**Description :** The voltage current graph for a platinum wire conductor at temperature T1 and T2 is as shown in the figure. (Given temperature coefficient of platinum is α and R0 to the resistance of platinum wire at 0°C). The value of ( ... (\frac{2}{\alpha R_0}sin2 \theta\) (4) \(\frac{2}{\alpha R_0}cot2 \theta\)

1 view

**Description :** The existing resistance of a conductor is dependent upon its length, cross-sectional area, _____________. A. temperature and insulation B. material and insulation C. resistive coefficient and material D. material and temperature

**Last Answer :** Answer: D

2 views

**Description :** When hot liquid is poured into a thick glass tumbler, it cracks because glass – (1) is a bad conductor of heat so only inner surface expands (2) has high temperature coefficient of expansion (3) has a very low specific heat (4) has low temperature coefficient of expansion

**Last Answer :** (1) is a bad conductor of heat so only inner surface expands Explanation: When hot liquid is poured into a thick glass tumbler, it cracks because glass is a bad conductor of heat so only inner surface expands.

32 views

**Description :** When hot liquid is poured into a thick glass tumbler, it cracks because glass : (1) is a bad conductor of heat so only inner surface expands (2) has high temperature coefficient of expansion (3) has a very low specific heat (4) has low temperature coefficient of expansion

**Last Answer :** is a bad conductor of heat so only inner surface expands

87 views

**Description :** Problem on temperature coefficient of resistance 3

**Last Answer :** Problem on temperature coefficient of resistance 3

81 views

**Description :** Problem on temperature coefficient of resistance 2

**Last Answer :** Problem on temperature coefficient of resistance 2

85 views

**Description :** Problem on temperature coefficient of resistance 1

**Last Answer :** Problem on temperature coefficient of resistance 1

163 views

**Description :** A semiconductor device made out of a material having very high temperature coefficient of resistance is

**Last Answer :** A semiconductor device made out of a material having very high temperature coefficient of resistance is Thermistor

109 views

**Last Answer :** The resistance temperature coefficient is defined as the ratio of increase in resistance per degree centigrade to the resistance at 0oC.

210 views

**Last Answer :** A metal resistor has resistance of 10 ohm at 0°C and 11 ohms at 160°C, the temperature coefficient is 0.000625 /°C.

150 views

**Description :** what is the temperature coefficient of Resistance of semiconductor ?

**Last Answer :** semiconductors have negative temperature coefficient of resistance. means as the temperature increases resistance decreases.

238 views

**Last Answer :** Whenever a wave is incident on a perfect conductor then the reflection coefficient is 0.

0 views

**Description :** A transmission line 1 km long is prepared from 17 kg of magnin 20°C. What is the maximum and minimum temperature within which it can operate if its resistance is to be within 0.76 Ωm of its calibrated value. Given Coefficient ... Density at 200C = 8.5 x 103 m-3 Resistively at 200C = 4.4 x 10-7 Ωm

0 views

**Description :** Using the Ohm's circuit, for determination of resistnace of a wire made of an alloy of constant temperature coefficient of resistance (α) , a student obtained the resistance of the wire at 0°C, at 100°C and at t°C as ... 3.42 Ω respectively. The temperature t is (1) 60°C (2) 70°C (3) 80°C (4) 90°C

1 view

**Description :** The temperature coefficient of copper is `0.004^(@)C^(-1)`. Find the resistance of a 5 m long copper wire of diameter 0.2 mm at `100^(@)C`, if the res

**Last Answer :** The temperature coefficient of copper is `0.004^(@)C^(-1)`. Find the resistance of a 5 m long copper wire of ... `0^(@)C` is `1.7xx10^(-8) Omega` m.

2 views

**Description :** The temperature coefficient of a resistance wire is `0.00 12.5^(@)C^(-1)`. At 300 K, its resistance is `1 Omega`. At what temperature the resistance o

**Last Answer :** The temperature coefficient of a resistance wire is `0.00 12.5^(@)C^(-1)`. At 300 K, its ... the resistance of the wire will be `2 Omega` ?

0 views

**Description :** The temperature coefficient of resistance of the material of a wire is `0.00125^(@)C^(-1)`. Its resistance at `27^(@)C` is `1 Omega`. At what temperat

**Last Answer :** The temperature coefficient of resistance of the material of a wire is `0.00125^(@)C^(-1)`. Its resistance at ... K B. 1100 K C. 1400 K D. 1127 K

0 views

**Description :** The temperature coefficient of resistance of an alloy used for making resistor is

**Last Answer :** The temperature coefficient of resistance of an alloy used for making resistor is A. small and ... C. large and positive D. large and negative

0 views

**Description :** The resistance of a bulb filmanet is `100Omega` at a temperature of `100^@C`. If its temperature coefficient of resistance be 0.005 per `.^@C`, its re

**Last Answer :** The resistance of a bulb filmanet is `100Omega` at a temperature of `100^@C`. If its temperature coefficient of ... . `200^(@)C` D. `400^(@)C`

14 views

**Description :** When temperature rises, resistance of negative temperature coefficient thermistor A. increases B. decreases C. zero D. infinity

**Last Answer :** decreases

4 views

**Description :** Which temperature coefficient indicates a material whose resistance increases as temperature increases?

**Last Answer :** Positive.

5 views

**Description :** Define the temperature coefficient of resistance.

**Last Answer :** The amount of increase in the resistance of a 1-ohm sample of the conductor per degree of temperature rise above 0º C

145 views

**Description :** The fractional change in resistance per kelvin is known as, a. temperature coefficient of resistance b. coefficient of Voltage of charge c. thermal expansion d. all of above

**Last Answer :** a. temperature coefficient of resistance

17 views

**Description :** Semi-conductors have ________ temperature coefficient of resistance. (A) Negative (B) Positive (C) Both positive and negative (D) None of the above

**Last Answer :** (A) Negative

148 views

**Description :** Which amongst the following has a negative coefficient of temperature for resistance? a) Copper b) Lead c) Carbon d) Aluminium

**Last Answer :** Which amongst the following has a negative coefficient of temperature for resistance? Carbon

344 views

**Last Answer :** A semiconductor has Negative temperature coefficient of resistance.

450 views

**Description :** The metal having the lowest temperature coefficient of resistance is

**Last Answer :** The metal having the lowest temperature coefficient of resistance is gold.

2.7k views

**Description :** How does the resistance of a conductor compare to that of an insulator?

**Last Answer :** The resistance of a conductor can be significantly lower than the resistance of an insulator, depending on each material's atomic properties.

542 views

**Description :** Write the four factors affecting the resistance of a conductor.

**Last Answer :** Factors affecting the resistance of a conductor: - 1.Physical state of a conductor 2.Length of a conductor 3.Area of cross section of a conductor 4.Resistivity of a conductor

518 views

**Description :** The effective resistance of a conductor will be the same as ohmic resistance when : - a) current is in true sine wave form b) voltage is low c) power factor is unity d) current is uniformly distributed in the conductor cross-section

**Last Answer :** The effective resistance of a conductor will be the same as ohmic resistance when : - current is uniformly distributed in the conductor cross-section

86 views

**Description :** With the increase in the cross sectional area of the conductor, the value of resistance: (1) Increase (2) Remain same (3) Decrease (4) None of these

**Last Answer :** With the increase in the cross sectional area of the conductor, the value of resistance: Decrease.

98 views

**Description :** resistance of conductor depends on?

**Last Answer :** Use of material Temperature of surrounding Length of conductor Area of cross section of conductor

0 views

**Description :** At what temperature would the resistance of a copper conductor be double its resistance at 0°C.

0 views

**Description :** What will happen to the resistance if the electric conductor temperature and cross section remain unchanged ?

**Last Answer :** If the conductive temperature and the cross section remain unchanged, increasing the length will increase the resistance.

1 view

**Description :** Why does the resistance of the conductor increase when the temperature increases ?

**Last Answer :** Because the vibrations of the atoms inside the conductor increase.

4 views

**Description :** A platinum resistance thermometer makes use of the variation of a conductor with temperature. If the resistance of this thermometer is `5 Omega " at "

**Last Answer :** A platinum resistance thermometer makes use of the variation of a conductor with temperature. If the resistance ... for the platinum `=0.0036^(@)C`.

2 views

**Description :** The resistance of a conductor is inversely proportional to its - (1) temperature (2) resistivity (3) area of cross section (4) length

**Last Answer :** (3) area of cross section Explanation: The resistance of a current carrying conductor is inversely proportional to the area of cross section of the conductor. This is because the resistance occurs due to the collision of electrons/charged particles.

7 views

**Description :** Indicate the three types oftransmissionline energylosses. a. I2R, R , and temperature b. Radiation, I2R, and dielectric heating c. Dielectric separation, insulation breakdown, and radiation d. Conductor heating, dielectric heating, and radiation resistance.

**Last Answer :** b. Radiation, I2R, and dielectric heating

127 views

**Description :** Compare RTD and thermistor on the basis of temperature coefficient , linearity, temperature range and cost.

**Last Answer :** Parameters RTD Thermistors Temperature coefficient It has positive temperature Coefficient (PTC) of Resistance. It has both positive and negative temperature Coefficient (PTC and NTC) of Resistance. ... -270oC to 2800oC -150oC to 300oC Cost High cost Low cost

86 views

**Description :** Which of the following has nearly zero temperature coefficient? A) Constantan B) Manganin C) Both A and B D) None of these

**Last Answer :** Which of the following has nearly zero temperature coefficient? A) Constantan B) Manganin C) Both A and B D) None of these

257 views

**Description :** Which of the following has negative temperature coefficient? A. Brass B. Mercury C. Electrolytes D. Silver.

**Last Answer :** Electrolytes has negative temperature coefficient.

1 view

**Description :** What is the heat coefficient of resistance ?

**Last Answer :** Answer : The coefficient of heat is the amount of radh that increases with the increase in temperature per ohm of radh.

1 view

**Description :** A plantinum wire has resistance of `10 Omega` at `0^(@)C` and `20 Omega` at `273^(@)C`. Find the value of coefficient of resistance.

**Last Answer :** A plantinum wire has resistance of `10 Omega` at `0^(@)C` and `20 Omega` at `273^(@)C`. Find the value of coefficient of resistance.

5 views

**Description :** Determine the viscous damping coefficient if damper offers resistance 0.05N at constant velocity 0.04m/sec A 0.8N-sec/m B 1.5N-sec/m C 2.5N-sec/m D 1.25N-sec/m

**Last Answer :** D 1.25N-sec/m

13 views

**Description :** Coefficient of resistance is the ratio of (A) Actual velocity of jet at vena-contracta to the theoretical velocity (B) Area of jet at vena-contracta to the area of orifice (C) Loss ... available at the exit of the orifice (D) Actual discharge through an orifice to the theoretical discharge

**Last Answer :** Answer: Option C

3 views

**Description :** Coefficient of discharge Cd is equal to (where Cc = Coefficient of contraction, Cv = Coefficient of velocity, and Cr = Coefficient of resistance) (A) Cc × Cv (B) Cc × Cr (C) Cv × Cr (D) Cc /Cr

**Last Answer :** Answer: Option A

26 views

**Description :** In a braking test, a vehicle travelling at 36 km ph was stopped at a braking distance of 8.0 m. The average value of the vehicle's skid resistance (friction coefficient) is (A) 0.64 (B) 6.25 (C) 0.16 (D) None of these

**Last Answer :** Answer: Option C

7 views

**Description :** Manganese steels (A) Are non-magnetic (B) Possess high electrical resistance (C) Possess low coefficient of expansion (D) All the above

**Last Answer :** Answer: Option D

0 views

**Description :** 1. A two-wire d.c. distributor 1000m long is fed from both ends with a uniform loading of 2A per meter. The resistance of each conductor of the distributor is 0.05Ω per km. A point of ... either end of the supply points of the distributor b. The total power supplied from either end the distributor

0 views

**Description :** (a) Explain the term drift velocity of electrons in a conductor. Hence obtain the expression for the current through a conductor in terms of drift velocity. (b) Two cells of emfs E1 and ... (ii) equivalent internal resistance of the combination (iii) potential difference between the points A and B.

...