Bundle: Refrigeration And Air Conditioning Technology, 8th + Lab Manual + Lms Integrated For Mindtap Hvac-r, 4 Terms (24 Months) Printed Access Card
8th Edition
ISBN: 9781337087315
Author: John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher: Cengage Learning
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Question
Chapter 19, Problem 1RQ
To determine
The recommended repair for a defective relay.
Expert Solution & Answer
Answer to Problem 1RQ
The recommended repair for a defective relay is to replace it.
Explanation of Solution
The relay is a switching device and it works to isolate or change the state of an electric circuit from one state to another state. The classification of the relay is based on its function. The some types of relay are listed below.
- Monitoring relay.
- Protective relay.
- Auxiliary relay.
- Regulating relay.
- Reclosing relay.
These different types of relays have different application in different types of fields such as motor control, electrical fuel pump, in controlling large power loads and high voltage. The most important advantage of the relay is that it takes a relatively small amount of power to operate the relay coil. It can be also used to control the motors, lamps, or heaters.
The relay is manufactured by the magnetic coil which is considered to be a throw away device. Due to the parts in the relay, it is not available for the rebuilding or repairing it. Therefore, the recommended repair for the defective relay is to replace it.
Conclusion:
The recommended repair for a defective relay is to replace it.
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This is an old practice exam question.
Steam enters the high-pressure turbine of a steam power plant that operates on the ideal reheat Rankine cycle at 700 psia and 900°F and leaves as saturated vapor. Steam is then reheated to 800°F before it expands to a pressure of 1 psia. Heat is transferred to the steam in the boiler at a rate of 6 × 104 Btu/s. Steam is cooled in the condenser by the cooling water from a nearby river, which enters the condenser at 45°F. Use steam tables.
NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part.
Determine the pressure at which reheating takes place. Use steam tables.
Find:
The reheat pressure is psia. (P4)Find thermal efficiencyFind m dot
Air at T1 = 24°C, p1 = 1 bar, 50% relative humidity enters an insulated chamber operating at steady state with a mass flow rate of 3 kg/min and mixes with a saturated moist air stream entering at T2 = 7°C, p2 = 1 bar. A single mixed stream exits at T3 = 17°C, p3 = 1 bar. Neglect kinetic and potential energy effects
Determine mass flow rate of the moist air entering at state 2, in kg/min
Determine the relative humidity of the exiting stream.
Determine the rate of entropy production, in kJ/min.K
Chapter 19 Solutions
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