विद्युत धारा Current Electricity | VVI 30 Objective Questions ? All Boards Exam 2023 | By Gopal Sir

Fuel cells are the commercial cells which converts the chemical energy into electrical energy and differ from the normal batteries since fuel cells require constant source of fuel and oxygen to obtain electric current. However, they can be used to produce electricity as long as the supply of fuel and oxygen is maintained. All fuel cells consist of an anode and a cathode and an electrolyte which allows charges to move between the two sides of the fuel cell. Electrons are drawn from anode to cathode through an external circuit and hence produce direct current electricity. Under practical cases, efficient of fuel cell is around 40-60% and in some cases it may be as high as 85-90% Some common examples of fuel cell are diect methanol fule cell (DMFC), Direct Borohydride fuel cell (DBFC), alkaline fuel cell (AFC) and others.While in DMFC the electrolyte is an ionomer (proton exchange monomer) in case of AFC and DBFC the electrolyte is an aqueous alkaline solution. Also, in case of DBFC the borohydride gets oxidised to metaborate, In all the above three cases, at cathode reduction of O_(2) (gas) occurs in a medium controlled by the electrolyte. Based on this information answer the electrolyte. Based on the information answer the question that follow : Data {:(DeltaH_(f)^(@)CH_(3)OH(l)=-230kJ//"mole",,DeltaH_(f)^(@)CO_(2) =-390kJ//"mole"),(Delta_(f)^(@)H_(2)O(l) = - 285 kJ//"mole",,S_(mH_(2)O(l))^(@)=130J//K "mole"),(S_(mCO_(2(g))) = 210 J//K "mole",S_(mH_(2)O(l))^(@) = 110 J//K "mol"),(S_(mO_(2(g)))=206J//K "mole",,S_(mH_(2(g))) = 130J//K "mole"),("All data at" 300 K.,1/F = 10^(-5)C^(-1)):} Which of the following information is correct about DMFC at 300 K if mathanol liquid is used as a fuel in DMFC ?

Fuel cells are the commercial cells which converts the chemical energy into electrical energy and differ from the normal batteries since fuel cells require constant source of fuel and oxygen to obtain electric current. However, they can be used to produce electricity as long as the supply of fuel and oxygen is maintained. All fuel cells consist of an andoe and a cathode and an electrolyte which allows charges to move between the two sidez of the fuel cell. Electrons are drawn from anode to cathode through an external circuit and hence produce direct current electricity. Under practical cases, efficient of fuel cell is around 40-60% and in some cases it may be as high as 85-90% Some common examples of fuel cell are diect methanol fule cell (DMFC), Direct Borohydride fuel cell (DBFC), alkaline fuel cell (AFC) and others.While in DMFC the electrolyte is an ionomer (proton exchange monomer) in case of AFC and DBFC the electrolyte is an aqueous alkaline solution. Also, in case of DBFC the borohydride gets oxidised to metaborate, In all the above three cases, at cathode reduction of O_(2) (gas) occurs in a medium controlled by the electrolyte. Based on this information answer the electrolyte. Based on the information answer the question that follow : Data {:(DeltaH_(f)^(@)CH_(3)OH(l)=-230kJ//"mole",,DeltaH_(f)^(@)CO_(2) =-390kJ//"mole"),(Delta_(f)^(@)H_(2)O(l) = - 285 kJ//"mole",,S_(mH_(2)O(l))^(@)=130J//K "mole"),(S_(mCO_(2(g))) = 210 J//K "mole",S_(mH_(2)O(l))^(@) = 110 J//K "mol"),(S_(mO_(2(g)))=206J//K "mole",,S_(mH_(2(g))) = 130J//K "mole"),("All data at" 300 K.,1/F = 10^(-5)C^(-1)):} If in DBFC it is known that sodium borohydride is taken as a fuel than which of the following reaction wil be occuring at approprite electrode in the DBFC ?

Fuel cells are the commercial cells which converts the chemical energy into electrical energy and differ from the normal batteries since fuel cells require constant source of fuel and oxygen to obtain electric current. However, they can be used to produce electricity as long as the supply of fuel and oxygen is maintained. All fuel cells consist of an andoe and a cathode and an electrolyte which allows charges to move between the two sidez of the fuel cell. Electrons are drawn from anode to cathode through an external circuit and hence produce direct current electricity. Under practical cases, efficient of fuel cell is around 40-60% and in some cases it may be as high as 85-90% Some common examples of fuel cell are diect methanol fule cell (DMFC), Direct Borohydride fuel cell (DBFC), alkaline fuel cell (AFC) and others.While in DMFC the electrolyte is an ionomer (proton exchange monomer) in case of AFC and DBFC the electrolyte is an aqueous alkaline solution. Also, in case of DBFC the borohydride gets oxidised to metaborate, In all the above three cases, at cathode reduction of O_(2) (gas) occurs in a medium controlled by the electrolyte. Based on this information answer the electrolyte. Based on the information answer the question that follow : Data {:(DeltaH_(f)^(@)CH_(3)OH(l)=-230kJ//"mole",,DeltaH_(f)^(@)CO_(2) =-390kJ//"mole"),(Delta_(f)^(@)H_(2)O(l) = - 285 kJ//"mole",,S_(mH_(2)O(l))^(@)=130J//K "mole"),(S_(mCO_(2(g))) = 210 J//K "mole",S_(mH_(2)O(l))^(@) = 110 J//K "mol"),(S_(mO_(2(g)))=206J//K "mole",,S_(mH_(2(g))) = 130J//K "mole"),("All data at" 300 K.,1/F = 10^(-5)C^(-1)):} If in AFC, H_(2)(g) is used as anode then identify the options which are not correct for AFC.

i. Tara, after completing her exams, went to her grandmother's house along with her younger brother Rahul. One day, Rahul came home after playing and switched on the fan as well as air conditioner. At the same time, his grandmother was preparing a milkshake of him using a mixer. Suddenly, there was a big sound and the electricity of the house got shut down. Tara then called an electrician. He said the main reason of supply to shut down was overlading Both Tara and Rahul asked few questions to the electrician as given below. What answers would the electrician has given below. What answers would the electrician had given to these questions? What happens to the flow of electric current during a short circuit?

i. Tara, after completing her exams, went to her grandmother's house along with her younger brother Rahul. One day, Rahul came home after playing and switched on the fan as well as air conditioner. At the same time, his grandmother was preparing a milkshake of him using a mixer. Suddenly, there was a big sound and the electricity of the house got shut down. Tara then called an electrician. He said the main reason of supply to shut down was overlading Both Tara and Rahul asked few questions to the electrician as given below. What answers would the electrician has given below. What answers would the electrician had given to these questions? What happens to the flow of electric current during a short circuit?