Solid contour lines are used on site plans to show _____
a. natural grade
b. footing elevation
c. finish grade
d. finish floor elevation
c
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Describe basements and where they are predominately used.
What will be an ideal response?
?Two technicians are discussing how excessive valve overlap affects a turbocharged engine. Technician A says that a turbocharger operates on backpressure in the exhaust. Technician B says that if the turbo operates at too low an rpm, backpressure can flow through the open exhaust valve into the intake air stream, limiting boost pressure into the cylinder. Who is right?
A. Technician A only B. Technician B only C. ?Both A and B D. ?Neither A nor B
The contacts of a contactor should be replaced if _____.
a. the contactor is more than two years old b. less than 12" remains c. less than 1/64" remains d. they get dirty
Answer the following statement(s) true (T) or false (F)
1. Three-wire motor control circuits have three control circuit wires between the motor starter and the control device(s). 2. Permanent contact control devices are called-out as either normally open or normally closed. 3. Once the motor starter contactor is energized and closes the holding contacts, the holding contacts provide a redundant electrical path around the normally open Start pushbutton contacts, to keep the contactor control coil energized. 4. The normally closed Stop pushbutton is wired as the third control component in the ladder rung, so that it has master control over the entire rung. 5. Once the motor starter contactor control coil is energized, and being held energized by the holding contacts, pressing the normally closed Stop pushbutton will de-energize the control coil; causing the contactor holding contacts to open.