Assume that a substation transformer has a constant hazard rate of 0.005 per day. What is...
Assume that a substation transformer has a constant hazard rate of 0.005 per day. What is the probability that it will fail during the next 5 years? What is the probability that it will not fail?
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Assume that a substation transformer has a constant hazard rate
of 0.005 per day. What is...
Assume that a substation transformer has a constant hazard rate of 0.005 per day. What is the probability that it will f...
Assume that a substation transformer has a constant hazard rate of 0.005 per day. What is the probability that it will fail during the next 5 years? What is the probability that it will not fail?
1) A three-phase substation transformer operating at 34.5kV is loaded to 24 MVA. What is the...
1) A three-phase substation transformer operating at 34.5kV is loaded to 24 MVA. What is the per-phase current? (assume balanced conditions) 2) If the current calculated above lags the voltage by 30°, what is the breakdown of active and reactive loading on the transformer? (assume balanced conditions)
(30) Assume that a distribution substation, shown below, has a 4000 kVA 69/12.47 kV LTC 4)...
(30) Assume that a distribution substation, shown below, has a 4000 kVA 69/12.47 kV LTC 4) transformer feeding a three-phase four-wire 12.47 kV distribution system. The transformer has a reactance of 0.065 pu. Assume that fault impedance is 40 Q and that the maximum and minimum power generations of the system are 600 and 360 MVA, respectively. Use 1 MVA as the three-phase power base: a) Under the maximum (system) power generation conditions, determine the available three- phase, L-L, and...
(30) Assume that a distribution substation, shown below, has a 4000 kVA 69/12.47 kV LTC 4)...
(30) Assume that a distribution substation, shown below, has a 4000 kVA 69/12.47 kV LTC 4) transformer feeding a three-phase four-wire 12.47 kV distribution system. The transformer has a reactance of 0.065 pu. Assume that fault impedance is 40 Q and that the maximum and minimum power generations of the system are 600 and 360 MVA, respectively. Use 1 MVA as the three-phase power base: a) Under the maximum (system) power generation conditions, determine the available three- phase, L-L, and...
(4 %) Q3. In a process facility, emergency equipment operates 8 hr per day, 7 days...
(4 %) Q3. In a process facility, emergency equipment operates 8 hr per day, 7 days per week. It is ift. estimated that on an average the equipment is turned on about 20 minutes per 8 hr sl The equipment is assumed to have a constant failure rate of o.08 per hour while it is on and of 0.005 per hour when it is turned off but being carried. a. What is the MTTF? b. What is the probability of...
13. If a hospital admits new pneumonia patients at a rate of about five per day,...
13. If a hospital admits new pneumonia patients at a rate of about five per day, what is the probability that during the next week: a) Exactly 35 pneumonia patients will be admitted? b) Exactly 40? c) 45 or more?
In an office building, light bulbs fail at an average rate of two per day. The...
In an office building, light bulbs fail at an average rate of two per day. The company that replaces the bulbs will not do so unless at least three bulbs have been reported failed by the end of the previous day. The company came yesterday. A bulb in your office fails today. What is the probability that it will be replaced tomorrow?
Suppose that the life distribution of an item has the hazard rate function (t) = t3,...
Suppose that the life distribution of an item has the hazard rate function (t) = t3, for t > 0. What is the probability that a 1 year old item will survive to age 2?
4. A gold miner has a claim in the Yukon. Every day he goes to his...
4. A gold miner has a claim in the Yukon. Every day he goes to his claim and mines for gold. Assume that on any given day the probability that he will find gold is 0.005. Assume that his chance of finding gold on a particular day is independent of his finding gold on any other day. a. what is the expected number of days that it will take him to find gold for the first time? b. if he...
Suppose that busses arrive at a station with constant rate per minute. Conferences 1. Assume that...
Suppose that busses arrive at a station with constant rate per minute. Conferences 1. Assume that one waits at the station for 5 minutes. (a) Find the probability that there are at least 2 busses within 5 minutes. (b) Find the expectation and variance of the number of busses within 5 minutes
(30) Assume that a distribution substation, shown below, has a 4000 kVA 69/12.47 kV LTC 4) transformer feeding a three-phase four-wire 12.47 kV distribution system. The transformer has a reactance of 0.065 pu. Assume that fault impedance is 40 Q and that the maximum and minimum power generations of the system are 600 and 360 MVA, respectively. Use 1 MVA as the three-phase power base: a) Under the maximum (system) power generation conditions, determine the available three- phase, L-L, and...
(30) Assume that a distribution substation, shown below, has a 4000 kVA 69/12.47 kV LTC 4) transformer feeding a three-phase four-wire 12.47 kV distribution system. The transformer has a reactance of 0.065 pu. Assume that fault impedance is 40 Q and that the maximum and minimum power generations of the system are 600 and 360 MVA, respectively. Use 1 MVA as the three-phase power base: a) Under the maximum (system) power generation conditions, determine the available three- phase, L-L, and...
(4 %) Q3. In a process facility, emergency equipment operates 8 hr per day, 7 days per week. It is ift. estimated that on an average the equipment is turned on about 20 minutes per 8 hr sl The equipment is assumed to have a constant failure rate of o.08 per hour while it is on and of 0.005 per hour when it is turned off but being carried. a. What is the MTTF? b. What is the probability of...
Suppose that busses arrive at a station with constant rate per minute. Conferences 1. Assume that one waits at the station for 5 minutes. (a) Find the probability that there are at least 2 busses within 5 minutes. (b) Find the expectation and variance of the number of busses within 5 minutes
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