VI Characteristics of Fuel Cell

1. What is the primary reason for the drop in voltage as current increases in a fuel cell?

a) Increase in temperature
b) Decrease in fuel supply
c) Irreversible losses such as activation, ohmic, and concentration losses
d) Increase in power output

2. In which region of the V-I curve are fuel cells typically operated to ensure optimal performance?

a) Region dominated by activation losses
b) Region dominated by ohmic losses
c) Region dominated by concentration losses
d) Beyond the maximum power point

3. How does increasing the temperature of a fuel cell generally affect its performance?

a) Decreases reaction rate
b) Increases reaction kinetics and reduces activation losses
c) Increases ohmic losses
d) Leads to permanent cell failure

4. Which of the following can reduce ohmic losses in a fuel cell?

a) Increasing the electrolyte conductivity
b) Using thicker electrodes
c) Decreasing the operating temperature
d) Using lower pressure reactants

5. In a fuel cell, a rapid decrease in voltage at high current densities is mainly due to:

a) Ohmic losses
b) Water accumulation
c) Concentration polarization
d) Activation energy