A given circuit using an RC integrator to turn on after 20 seconds now takes has been taking much longer to turn on. Now it entirely fails to turn on. What is the problem?
A) The capacitor has decreased in value. B) The capacitor has increased in value.
C) The resistor has opened. D) The resistor has decreased in value.
C
You might also like to view...
What could abnormal pressure changes indicate?
A. Fouling B. Tube plugging C. Internal tube leaks D. Wear through the tube walls
Sickle-cell anemia is an inherited disease in which red blood cells are misshapen and sticky. Sickle cells tend to form clumps in blood vessels, inhibiting the flow of blood. Humans have two genes for sickle-cell anemia, either of which may be S for normal cells or s for sickle cells. A person with two copies of the s gene will have sickle-cell anemia. A person with one s gene and one S gene will not have the disease, but will be a carrier, which means that the s gene may be transmitted to the person’s offspring. If two carriers have a child, the probability is 0.25 that the child will have the disease and 0.5 that the child will be a carrier. Outcomes among children are independent.
a. A mother and father who are both carriers have two children. What is the probability that neither child has the disease? b. What is the probability that both children are carriers? c. If neither child has the disease, what is the probability that both are carriers? d. A woman who is the child of two carriers has a child by a man who is a carrier. What is the probability that this child has the disease?
How does a pressure-time-temperature defrost system measure frost?
A) The system has a timer control triggered by pressure drop. B) The system has a reversing valve that controls the defrost thermostat. C) The system has a timing circuit that controls the defrost thermostat. D) The system has a differential airflow pressure switch.
A variable-air-volume zone system can:
A) Match the airflow and system capacity to the load. B) Overblow a zone if only one zone is calling. C) Allow the homeowner to dial in the desired airflow. D) Require more bypass air than a traditional zone system.