Answer the following statement(s) true (T) or false (F)
1. states that all radiation patterns will decrease by the square of the distance.
2. states that the measured level of signal intensity will decrease by 3 dB for every doubling of
distance from the source.
3. will work of only sound waves.
4. states that by decreasing the distance to the source by half, will increase the sound intensity by
6db.
1. T
2. F
3. T
4. T
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When three solid-state relays are connected in series, the supply voltage must be _____.
a. half of the minimum operating voltage for a single relay b. a third of the minimum operating voltage for a single relay c. triple the minimum operating voltage for a single relay d. four times the minimum operating voltage for a single relay
When below grade buildings are located under driving surfaces, it is essential that firefighters conduct preincident planning to:
A. identify the cables that anchor the roof to the ground. B. determine if automatic sprinkler protection is required. C. ensure fires exceeding four hours will not cause structural damage. D. address the potential for collapse due to the weight of the apparatus.
How much vacuum must a fuel oil pump produce to move fuel oil 20 feet horizontally?
A) 20 ÷ 10 = 2 inches of vacuum B) 20 ÷ 2 = 10 inches of vacuum C) 20 ÷ 5 = 4 inches of vacuum D) 20 × 1 = 20 inches of vacuum
Which one of the following statements about JFETs is not true?
A) Maximum channel current flows when the source-gate voltage is zero. B) The p-n junction of a JFET must be reversed-biased for normal operation. C) A JFET is a voltage-controlled device. D) The gate and channel materials must be the same type materials.