What will happen if the motor is overloaded in a basic stop-start, push-button circuit with overload protection?
What will be an ideal response?
If the motor is overloaded, it will cause too much current to flow through the circuit. When a current greater than normal flows through the overload heater, the heater produces more heat than it does under normal conditions. If the current becomes high enough, it will cause the normally closed overload contact to open. Notice that the overload contact is electrically isolated from the heater. The contact, therefore, can be connected to a different voltage source than the motor. If the overload contact opens, the control circuit is broken and the relay de-energizes as if the STOP button had been pushed. After the overload contact has been reset to its normally closed position, the coil will remain de-energized until the START button is again pressed.
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The reason France needed to control the Ohio Valley was to
A. stop Spain from extending its empire. B. help win the War of Jenkins's Ear. C. stop the Indian attacks on its outposts. D. link its Canadian holdings with those of the lower Mississippi Valley. E. be able to put more of its settlers there in order to increase farm production.
Answer the following statement(s) true (T) or false (F)
1. The type of three-phase service is determined by the type of secondary transformer connection supplied by the power company. 2. Fuses are connected in series with the load 3. Many circuit breaker panels are designed to employ half-size circuit breakers. 4. The fall-of-potential test requires the use of a ground resistance meter. 5.The clamp-on ground resistance test has several advantages over the three-point fall-of-potential test.
Why is an air-weather barrier (AWB) not required on flat roofs?
What will be an ideal response?
Most paints containing ____________________ have been removed from the market; however, some industries, such as marine or ship applications, still use them.
Fill in the blank(s) with the appropriate word(s).