When a differential pressure technique is used to measure level in a pressurized vessel, the low pressure sensor of the DP device is generally connected to __________.
A. the bottom of the vessel
B. the vapor space above the stored fluid
C. atmosphere
D. a vacuum pump
Answer: B
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Answer the following statement(s) true (T) or false (F)
1. Packaged variable speed drives generally operate on AC. 2. The AC service in industrial plants can not be converted to direct current for use with DC variable-speed controls. 3. The field of the DC generator can be reversed manually or automatically with a resulting reversal of the motor rotation. 4. A controlling tachometer feedback signal may be driven by the DC motor driveshaft. 5. The generator field resistance can be changed manually or automatically by latching relays.
All of the following statements about the air injection system are true EXCEPT:
A. a diverter valve, or a similar type of device, prevents a backfire during deceleration. B. a one-way check valve prevents exhaust from backing up into the hoses and pump. C. a high-pressure vane-type pump driven by a crankshaft belt provides air. D. computer-controlled three-way catalyst systems include an air switching valve that moves the injected air into the exhaust manifold or into part of the catalytic converter.
Newborn degus are fully haired, however they are unable to see until their eyes open (between 2 and 3 weeks after birth)
A. True B. False
Which of the following best characterizes U.S. policy toward nutrition education?
a. Maintain a healthy weight, exercise, let the food pyramid guide food choices, and eat other foods in moderation. b. Eat a variety of foods. c. Eat a variety of foods in moderation. d. Eat a variety of foods and if you drink, do so in moderation. e. Eat a science-based diet.