In certain employment situations, such as with a consulting structural engineering firm, the structural CAD technician is often called upon to prepare plans for structures involving all four types of structural products. Name two of these four types.
What will be an ideal response?
The four types of structural products include:
• structural steel
• precast concrete
• poured-in-place concrete
• structural wood
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The ____ in a refrigeration system is responsible for absorbing heat into the system from whatever medium is to be cooled.
A. evaporator B. thermostat C. compressor D. condenser
When choosing a contactor to operate a compressor, which amperage rating is used?
a. The inductive amps rating listed on the side of the contactor. b. The resistive amps rating listed on the side of the contactor. c. It doesn’t matter as long as it is above the compressor RLA
In using BJT characteristic curves, the straight line drawn between the cutoff and the saturation points is called:
A) operating line. B) cutoff line. C) load line. D) saturation line.
Which of the statements below best describes the basic operation of a dual-slope A/D converter?
A) The input voltage is used to set the frequency of a voltage-controlled oscillator (VCO). The VCO quits changing frequency when the input voltage stabilizes. The frequency of the VCO, which is proportional to the analog input voltage, is measured and is displayed on the digital display as a voltage reading. B) A ramp voltage and analog input voltage are applied to a comparator. As the input voltage causes the integrating capacitor to charge, it will at some point equal the ramp voltage. The ramp voltage is measured and displayed on the digital panel meter. C) Two ramps are generated: one by the input voltage and the other by a reference voltage. The input voltage ramp charges the integrating capacitor, while the reference voltage discharges the capacitor and enables the counter until the capacitor is discharged, at which time the counter value is loaded into the output latches. D) A ramp generator is used to enable a counter through a comparator. When the ramp voltage equals the input voltage the counter is latched and then reset. The counter reading is proportional to the input voltage since the ramp is changing at a constant V/second rate.