Technician A says that worn valve guides can cause excess oil consumption. Technician B says that valve guides can be measured with a dial bore gauge. Who is correct?

A. A only
B. B only
C. Both A and B
D. Neither A nor B


Answer: C

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On a chilly afternoon, you decide to use a portable electric heater to warm the air. Describe the heat transfer processes that occur.

What will be an ideal response?

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(a) Determine, using the curves obtained in Prob. 18.1, the times required to obtain 1 percent and 99 percent pearlite at 700 and 550°C.

(b) Compare these times with the experimental data for an eutectod plain?carbon steel shown in the time?temperature?transformation diagram (TTT) in Fig. 18.21. Is the agreement reasonable?

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The difference between an SCR and a TRIAC is that:

A) An SCR can switch AC current but an TRIAC can only switch DC current. B) A TRIAC can switch AC current but an SCR can only switch DC current. C) A TRIAC passes three times as much current as an SCR. D) An SCR regulates AC voltage and a TRAIC only works with both DC and AC.

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In digital electronics, each of the two normal states of a voltage variable is called a(n):

A) indeterminate value. B) actual number. C) logic level. D) algebraic sum.

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