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?
(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?
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.
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.