How many sensors must be triggered at the same time to cause an airbag deployment? A. One B. Two C. Three D. Four

A) One
B) Four
C) Three
D) Two


Answer: D) Two

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Technician A says that backup sensors use LEDs to detect objects. Technician B says that a backup sensor will not work correctly if the paint is thicker than 0.006 inch. Who is right?

A) Technician A only B) Technician B only C) Both A and B D) Neither A nor B

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How do industry organizations make it easier to compare testing results and rating for HVACR equipment?

A) Industry organizations state that there are too many standards in place to make testing results comparable. B) Industry organizations use a set of guidelines that are determined by the individual states. C) Industry organizations determine a set of standard conditions that make all HVACR testing results comparable. D) Industry organizations simply follow guidelines that are determined by the U.S. government.

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A dc, separately excited motor is driven by a full-wave, SCR, ac/dc converter. The voltage on the ac side is 120 V (rms). The field constant of the motor K? = 3 Vs. At a load torque of 300 Nm and triggering angle of 40o , the motor speed is 100 rpm, and the armature current is continuous.

a. The polarities of the terminal voltage of the motor (armature voltage) are reversed, and the triggering angle is simultaneously changed. Assume that the load torque is also reversed and is equal to 300 Nm. Calculate the triggering angle that stops the motor and keeps it at the holding position. Assume that the current is still continuous. b. Sketch the speed-torque characteristics and indicate the steady state operating points before and after polarity reversal.

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Four mutually exclusive, direct benefit alternatives are compared using the B/C method. Which alterĀ­native, if any, should be selected?

What will be an ideal response?

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