What is the most important part of the fuel cell stack and what is its purpose?
What will be an ideal response?
The most important part of the fuel cell stack and the way it connects together is the bipolar (interconnect) plate. This critical piece of equipment is what allows the electrons produced in the fuel cell reaction to gather and then move into a wiring system to produce electric current.
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The method of starting in which only half the motor winding is used during starting is called ____________________ starting.
Fill in the blank(s) with the appropriate word(s).
If P-type material is sandwiched between two N-type materials, the transistor is referred to as a(n) ____________________ transistor.
Fill in the blank(s) with the appropriate word(s).
PROBLEM 3.21 Two solid steel shafts are connected by the gears shown. A torque of magnitude T = 900 N ยท m is applied to shaft AB. Knowing that the allowable shearing stress is 50 MPa and considering only stresses due to twisting, determine the required diameter of (a) shaft AB, (b) shaft CD.
For the majority of air -conditioning and heating jobs, ductwork is not included as part of the installation.
Answer the following statement true (T) or false (F)