If pill boxes are passing the sensor location at a 40 mm distance and the sensor can only be mounted on one side of the conveyor, then the best choice for a sensor would be
A) Capacitive proximity.
B) Transmitted-beam photoelectric.
C) Inductive proximity.
D) Diffused-beam photoelectric.
E) None of the above
D
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Air enters the duct of an air-conditioning system at 15 psia and 50°F at a volume flow rate of 450?ft3/min. The diameter of the duct is 10 in, and heat is transferred to the air in the duct from the surroundings at a rate of 2 Btu/s. Determine (a) the velocity of the air at the duct inlet and (b) the temperature of the air at the exit.
What will be an ideal response?
All of the following statements are correct EXCEPT ________
A) Leak detecting dye should be used with a black light B) Engine degreaser often uses engine heat to dissolve grease C) It is normal for an engine to stall when sprayed with water D) Avoid high-pressure rinsing of ignition wires or distributor caps
You need to know how to reconnect a three-phase motor for a change of voltage ________
A) because some three-phase motors need DC voltage instead of AC voltage B) because the motor may need more speed C) because the voltage rating of the motor that you have in stock is rated 480 V AC and the motor that it is replacing is rated for 240 V AC
Answer the following statement(s) true (T) or false (F)
1. Stress provides a measure of the intensity of internal forces acting over an area. 2. The modulus of elasticity, or Young’s modulus, is computed by calculating the slope of a stress-strain diagram over the elastic region. 3. The modulus of elasticity is a measure of how easily a material will stretch when pulled (subject to a tensile force) or how well the material will shorten when pushed (subject to a compressive force). 4. A ductile material shows little or no permanent deformation before it ruptures. 5. A brittle material, when subjected to a tensile load, will go through significant permanent deformation before it breaks.