Do you think plants that are insect pollinated or plants that are wind
pollinated are more efficient at pollination? Why?
What will be an ideal response?
Insect-pollinated plants are more efficient because the pollen they produce is
transferred directly to the female reproductive organs of neighboring plants.
However, wind-pollinated plants must produce great amounts of pollen so that,
statistically speaking, it is ensured that pollen grains are deposited on the female
reproductive structures. Most of the pollen produced by these plants will never
reach this final destination
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Which of these is an explosive (pyrotechnic) device that tightens the seat belt as the airbag is being deployed?
A) Belt switch B) Clockspring C) Pretensioner D) Igniter
Electronic temperature sensors can be:
A) Generally less accurate than bimetal thermometers. B) Thermocouple, thermistor, or wire wound. C) Thermistor, bimetal, or charged bulb. D) Bimetal, mercury bulb, or piezoelectric.
Carry the answer to three decimal places. A power company charges a city $1.2167 per street lamp per month. There are 1,125 street lamps supplied with current. What is the city's power bill per year for the street lamps?
Fill in the blank(s) with the appropriate word(s).
Refer to Problem 9.38 and assume a load voltage waveform as shown in Figure P9.40. Also assume:
|io|avg = 60 mA |vo|avg = 5 V |Vripple| = 5%
vline = 170 cos(?t) V ? = 377 rad/s
Determine:
a. The turns ratio n.
b. The capacitor C.
Problem 9.38
In the full-wave power supply shown in Figure P9.38 the silicon diodes are 1N4001 with a rated peak reverse voltage of 25 V.
n = 0.05883
C = 80 ?F Ro = 1 k?
vline = 170 cos(377t) V
a. Determine the actual peak reverse voltage across each diode.
b. Explain why these diodes are or are not suitable for the specifications given.
