Description : The resistance of material increases with temperature -General Knowledge
Last Answer : The answer is 'Metal'
Description : Indicate the false statement about the resistance of a wire – (1) it depends on material of wire (2) it is directly proportional to the length of wire (3) it is directly proportional to the area of crosssection of wire (4) resistance of metallic wire increases with increase in temperature
Last Answer : (3) it is directly proportional to the area of cross-section of wire Explanation: The property of conductor due to which it opposes the flow of current through it is called Resistance. It is ... potential difference across its ends to the current flowing through it The SI unit of resistance is ohm.
Description : The resistance of material increases with temperature. What is this?
Last Answer : Metal
Description : Which temperature coefficient indicates a material whose resistance increases as temperature increases?
Last Answer : Positive.
Description : Indicate the false statement about the resistance of a wire (1) it depends on material of wire (2) it is directly proportional to the length of wire (3) it is directly proportional to the area of cross-section of wire (4) resistance of metallic wire increases with increase in temperature
Last Answer : it is directly proportional to the area of cross-section of wire
Description : With decrease in the grain size of a material, its creep resistance (A) Increases (B) Decreases (C) Remain constant (D) Either (A) or (B); depends on the material
Last Answer : (C) Remain constant
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.
Description : A megger is being used to test the insulation of an AC generator. The resistance value of a dry, clean winding will _____________. A. continue to rise as test potential is maintained, ... , becoming fairly steady after 5-7 minutes D. stabilize after approximately 2-4 minutes of fluctuation
Last Answer : Answer: A
Description : The resistance of electric wire will decrease as its _______________. A. length increases B. cross-sectional area increases C. temperature increases D. percent of metallic purities increases
Last Answer : Answer: B
Description : When the current flow through a copper wire increases, its _____________. A. resistance will decrease B. insulation will burn C. temperature will increase D. conductivity will increase
Last Answer : Answer: C
Description : You are testing the insulation in an AC generator with a megohmeter. The resistance value of a dry, clean winding will ____________. A. continue to rise as the test potential is maintained, ... fairly steady after 5 to 7 minutes D. stabilize after approximately 2 to 4 minutes of fluctuation
Description : When temperature rises, resistance of negative temperature coefficient thermistor A. increases B. decreases C. zero D. infinity
Last Answer : decreases
Description : Pick out the wrong statement. (A) The controlling resistance in case of heating of air by condensing steam is in the air film (B) The log mean temperature difference (LMTD) for ... a pure fluid at a given pressure from liquid to vapor or vice-versa occurs at saturation temperature
Last Answer : (C) In case of a 1 - 2 shell and tube heat exchanger, the LMTD correction factor value increases sharply, when a temperature cross occurs
Description : Temperature of the product during ultrafine grinding (A) Increases (B) Decreases (C) Remain constant (D) May increase or decrease; depends on the material being ground
Last Answer : (A) Increases
Description : Fatigue strength of a material increases by (A) Having notches in the specimen (B) Rise in temperature (C) Under stressing the specimen (D) Having scratches on the surface
Last Answer : (C) Under stressing the specimen
Description : The absorptivity of a grey body at a given temperature __________ with increasing wavelength of radiation. (A) Increases (B) Decreases (C) Remain constant (D) May increase or decrease; depends on the material
Last Answer : (D) May increase or decrease; depends on the material
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
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
Description : Kel-F is a material, which is (A) Chemically known as Polychlorotrifluoroethylene (PTFE) (B) Having excellent chemical & high temperature resistance (upto 200°C) (C) Having elastomeric properties (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : Pick out the wrong statement. (A) Alloys are harder than their component elements (B) Presence of silicon in steel decreases its electrical resistance (C) Karbate is an acid resistant material of construction ... , a steel alloyed with 10% Ni and 20% Cr can be used upto a temperature of 1100°C
Last Answer : (B) Presence of silicon in steel decreases its electrical resistance
Description : reduction in thermal resistance during heat transfer does not occur in the (A) Convection heat transfer by stirring the fluid and cleaning the heating surface (B) Conduction heat transfer by ... Radiation heat transfer by increasing the temperature and reducing the emissivity (D) None of these
Last Answer : Option C
Description : What term describes a material whose resistance remains relatively constant with changes in temperature?
Last Answer : Zero temperature coefficient.
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