An air-filled 5- by 2-cm waveguide has E, = 20 sin 40rx sin 50ry e V/m at 15 GHz. (a) What mode is being propagated? (b) Find B. (c) Determine E,/E,. Answer: (a) TM21, (b) 241.3 rad/m, (c) 1.25 tan 40rx cot 50ry.

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Speed control of motor

Speed control by DC motor-speed controller is required to realize variable speed drive. Whenever a motor drives a particular load, it is called drive, and variable speed drive refers to a load requiring variable speed. All this is obtained by a DC motor speed controller.