In pollination, pollen is transferred from:
A. filament to anther.
B. stigma to style.
C. filament to style.
D. anther to stigma.
Answer: D
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For the arch shown in Figure P6.20, the thrust force exceeded the abutment’s lateral support capacity, which is represented by a roller at C. Load P was removed temporarily and tension rod AC was added. If the maximum compression in members AB and BC will be 750 kips, what size diameter tension rod is required? (Ignore dead load of the arch.) The allowable tensile capacity of the rod is 32 ksi. Determine the reactions.
Rear air-conditioning systems use __________
A) An orifice t0ube to control the refrigerant flow into the front evaporator and a TXV with the rear evaporator B) An orifice tube to control the refrigerant flow into the front evaporator and the rear evaporator C) A TXV to control the refrigerant flow into the front evaporator and an orifice tube with the rear evaporator D) A TXV to control the refrigerant flow into the front evaporator and the rear evaporator
The __________ wire of a two-wire sourcing sensor sources current to a load device.
A. blue B. brown
Answer the following statement(s) true (T) or false (F)
1. Two methods of igniting the main burner exist today. 2. Probably the oldest method of automatically igniting a main burner is with a pilot light. 3. The thermocouple can produce enough current to reopen the valve if it is closed. 4. The “fire eye”gas flame sensor detects the heat of a flame. 5. Gas control valves direct the flow of gas to the main burner and the pilot light, if used.