Maps continue to be a good investment for drivers because

A. they are usually four-color and have pictures or photographs
B. they provide a good backup for drivers who rely on computerized trip planning
C. they usually show where truck stops are located
D. all of the above


Answer: B

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The circuit of Fig. 11.95 portrays a wattmeter connected into an ac network.

(a) Find the load current.
(b) Calculate the wattmeter reading.

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Pre-purge is the the process of energizing the burner blower for a period of time before allowing fuel to enter the combustion chamber. This process is also referred to as __________.

A. motor-off-delay B. valve-on-delay

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The ____ contains a coil of a few turns of large wire, and a set of normally open contacts.

a. hot-wire relay b. current relay c. potential relay d. solid-state relay

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In order to thread steel pipe, ____________________ is applied so friction and heat do not damage the pipe and/or cutting dies.

Fill in the blank(s) with the appropriate word(s).

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