Which resistor (RA) is necessary to generate a 330 ms pulse at the output of a monostable 555 timer if a 200 capacitor is used?
A) 1.5 k? B) 66 k? C) 133 k? D) 4.7 k?
A
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There are three red balls and seven white balls in box A, and six red balls and four white balls in box B. After throwing a die, if the number on the die is 1 or 6, then pick a ball from box A. Otherwise, if any other number appears (i.e., 2, 3, 4, or 5), then pick a ball from box B. Selected ball has to put it back before proceeding further. Answer the followings:
(a) What is the probability that the selected ball is red? (b) What is the probability a white ball is picked up in two successive selections?
If it is necessary to remove a substance from the surface of an explosionproof enclosure that cannot be cleaned with solvent, use ____.
A. a chisel B. a putty knife C. sandpaper D. a fine steel wool
Technician A says the flywheel/alternator/starter assembly may be positioned between the engine and the transmission and it does not require the very high voltage of the IMA. Technician B says the flywheel/alternator/starter assembly assists the engine when additional power is needed. Who is correct?
A. A only B. B only C. Both A and B D. Neither A nor B
The use of heat to join rigid copper piping and fittings is called _____
a. reaming b. tempering c. fluxing d. soldering