Pneumatic timers have better repeat accuracy that electronic timers. True False
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QUESTION 27
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Pneumatic timers have better repeat accuracy that electronic timers.
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- QUESTION 22 One of the oldest methods of timing is with a pneumatic timer. True FalseQUESTION 25 Pneumatic timers use a diaphragm and operate on the principle of air displacement. True FalseSelect one: O a. False O b. True The control console in Temperature Measurement Methods experiment can be used to display the voltage and the temperature of a thermocouple of type K. Select one: O a. False Ob. True In temperature measurement experinent, if three temperatures are considered (50 °C, °C, and 20 C) the measured voltage according to Peltier law respectively will be (knowir that the ambir
- True or False: The defrost timer motoroperates continuously in Figure 6.18.Time constant of thermocouple is 3 milliseconds. An engineer measures the temperature of water and sees that the temperature is less than the real temperature of the boiling water (100 C). How long does the engineer need to wait at least to see the 95 C? 8 milliseconds 5 milliseconds 3 milliseconds none of the given 9 milliseconds not sufficient informationAnother term used to describe sensitivity in electronic controls is A. temperature. B. gain. C. rpm. D. pressure.
- Name two methods used by electronic timers to obtain their time base.In relation to the circuit presented below, mark the alternative(s) that you consider correct. 1 To enable actuator A2 to advance, it is necessary to switch valve V2 to the leftmost position and ensure that valve V1 is in its initial (intermediate) position. 2 Switching valve V2 to the leftmost position allows actuator A2 to advance, but for this to happen, valve V1 must also be switched to the leftmost position. 3 When activating valve V1, using the locking lever installed on the left side of it, the two actuators (A1 and A2) are allowed to advance. 4 Hydraulic pump B1 is a simple variable displacement type. 5 Valves V1 and V2 have a TANDEM center.2) The continuous stopwatch timing method was used to obtain the observed times for a worker-machine task. Only one cycle was timed. The data are recorded in the table below. The times are listed indicate the stopwatch reading at the end of the element. Elements a, b, and d are worker-controlled elements. Element c is machine controlled. Elements a and d are external to the machine-controlled element, while element b is internal. Every four cycles, there is an irregular worker element that takes 1.32 min rated at 100% performance. For determining the standard time, the PFD allowance is 15% and the machine allowance is 30%. Determine a. The normal time b. Standard time for the cycle c. If worker efficiency is 100%, how many units will be produced in one 8-hour shift? d. If the actual time worked during the shift is 6.86 hours, and the worker performance is 125%, how many units will be produced? Description of Worker Time Description of (min) Rating (%) Element Machine Element Worker…
- Build a ladder logic diagram showing the timer delays.The Repeatability of the thermocouple, which work in the range of 10-170 C with the following reading data: 70, 80, 75, 86, 77, 82, 74 C 10 12 14 16 None of the aboveName Section 5-2: Line Diagrams-Signals, Decisions, and Actions In the following application, a temperature switch controls a heating contactor and a flow switch is used to ensure there is enough air flow. If there is not enough air flow, an alarm is sounded. Complete the required information. 1. List all the signal devices in the circuit. 2. List all the action devices in the circuit. 3. List the decision part of the circuit that automatically sounds the alarm if there is a problem. 4. When the heating element is on during normal operation, is the flow switch open or closed? CIRCULATING 2 L1 FAN TEMPERATURE SWITCH TR HEATING ELEMENTS FLOW SWITCH -HOT AIR PADDLE AIR FILTER NORMALLY CLOSED FLOW SWITCH 65 ALARM (SOUNDS IF NO FLOW FOR 15 SECONDS OR MORE) Date HEATING CONTACTOR TR ON-DELAY TIMER SUPPLY AIR COLD AIR (3) TIME SET= 15 SEC © 2014 American Technical Publishers, Inc. All rights reserved
