Explain what is meant by a chemical’s lower explosive limit and upper explosive limit.
What will be an ideal response?
The lower explosive limit is the minimum amount of chemical in air that will cause an explosion if a source of ignition is found; the upper explosive limit is the maximum amount of chemical in air that can result in an explosive. Any more than that amount and the mixture is too rich to ignite.
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Measurements should be recorded in field notes _____.
a. as they are taken b. hourly c. whenever there is time to do so d. at the end of the day
The steering gear rotates which part on a system using a conventional type steering gear?
A) Pitman arm B) Center link C) Intermediate shaft D) Idler arm
An increase in stick-out will result in:
A) No effect on current B) Increased current C) Increased voltage D) Reduced current E) Both A and D
The electrodynamic shaker of Figure P18.49 is used to perform vibration testing of an electrical connector. The connector is placed on the test platform (with mass m), and it may be assumed to have negligible mass when compared to the platform. The test consists of shaking the connector at the frequency ? = 2? × 100 rad/s. Given the parameter values B = 1,000 Wb/m2, l = 5 m, k = 1,000 N/m, m = 1 kg, b = 5 N-s/m, L = 0.8 H, and R = 0.5 ?, determine the peak amplitude of the sinusoidal voltage VS required to generate an acceleration of 5g (49 m/s2).
