One way in which dwarf fruit trees are produced is by grafting onto dwarfing rootstocks. What is the other source of dwarfness?
What will be an ideal response?
There is genetic dwarfness.
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Technician A says that some ABS sensors are mounted near the ring gear. Technician B says some ABS sensors are mounted on each axle shaft near the wheel hub. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician
The electronic defrost board in a packaged heat pump has the correct inputs and outputs to energize the reversing valve, but the valve does not energize. What is the next logical step in the troubleshooting process?
a. Replace the control board. b. Check the control board further for defects. c. Check the reversing valve coil. d. Replace the reversing valve.
Fertigation is the practice of:
A) applying fertilizer in the irrigation water. B) making precise fertilizer applications to decrease fertilizer run-off C) applying fertilizer using soil conservation practices. D) tracking fertilizer use with GPS navigation equipment.
Answer the following statement(s) true (T) or false (F)
1. The silicon-controlled rectifier (SCR) is made by bonding four layers of semiconductor material together to form a pn–pn junction. 2. SCRs are known as the workhorses of industrial electronics because of their ability to control hundreds of volts and amps. 3. SCRs can be tested with an ohmmeter by connecting the negative lead to the anode and the positive lead to the cathode. 4. The amount of gate current supplied to the SCR is determined by the amount of resistance connected in the gate circuit, and the difference in voltage between the power supply and the terminal voltage of the battery. 5. The gate-turnoff SCR operates in a fashion similar to a common SCR in that it can be turned off with a gate pulse that is negative with respect to the cathode.