Which of the following is an example of forced convection?
A) Heat traveling along a metal rod B) A radiant heater placed in a room
C) Air moving in a refrigerator D) A ceiling fan forcing warm air down
D
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A wireless receiver with an effective diameter of 250 cm is receiving signals at 20 GHz from a transmitter that transmits at a power of 30 mW and a gain of 30 dB.
(a) What is the gain of the receiver antenna? (b) What is the received power if the receiver is 5 km away from the transmitter?
PROBLEM 3.48 The design of the gear-and-shaft system shown requires that steel shafts of the same diameter be used for both AB and CD. It is further required that and that the angle through which end D of shaft CD rotates not exceed 1.5?. Knowing that G ? 77.2 GPa, determine the required diameter of the shafts.
Bevel gears are similar to hypoid gears in that the gear shaft axes in both types intersect.
Answer the following statement true (T) or false (F)
The high-voltage, low-amperage current supplied to welding machines by commercial power lines is known
as _____. a. primary current b. commercial current c. ordinary current d. secondary current