Feedforward control is capable of compensation for which of the following conditions?
A. unmeasurable disturbances
B. large measurable disturbances
C. long dynamic response times
D. both b and c
Answer: D
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Nuclear safety devices installed several years ago have been depreciated from a first cost of $200,000 to zero using MACRS. The devices can be sold on the used equipment market for an estimated $15,000, or they can be retained in service for 5 more years with a $9000 upgrade now and an OE of $6000 per year. The upgrade investment will be depreciated over 3 years with no salvage value. The challenger is a replacement with newer technology at a first cost of $40,000, n = 5 years, and S = 0. The new units will have operating expenses of $7000 per year.
(a) Use a 5-year study period, an effective tax rate of 40%, an after-tax MARR of 12% per year, and an assumption of classical straight line depreciation (no half-year convention) to perform an after-tax AW-based replacement study. (b) If the challenger is known to be salable after 5 years for an amount between $2000 and $4000, will the challenger AW value become more or less costly? Why?
Answer the following statement(s) true (T) or false (F)
1.The NEC® permits overcurrent protection devices to be located in bathrooms. 2.In residential wiring, all 120-volt, 15- and 20-ampere branch circuits supplying outlets or devices in kitchens, family rooms, dining rooms, living rooms, parlors, libraries, dens, bedrooms, sunrooms, recreation rooms, closets, hallways, laundry areas, or similar rooms must be AFCI protected. 3.A 12 AWG branch circuit can be protected by a 15-ampere fuse or circuit breaker. 4.A single-pole circuit breaker has one stab contact and a two-pole circuit breaker has two stab contacts. 5.A two-pole circuit breaker is used to protect a 120-volt branch circuit.
In the circuit branch below, with current and node definitions as shown, the black (negative) lead of an ideal voltmeter is attached to node "A" and the red (positive) lead is attached to node "B". If the voltmeter reads ?5V, what is the value for I, given the current direction shown in the diagram, if R=1k??
A. 5 A B. ?5 mA C. 5 mA D. ?5 kA E. ?5 A
Where was the X Window system originally developed?
What will be an ideal response?