2008PracticeExam5

2008PracticeExam5 - Name: _ Code # _ Summer Session 2008...

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Name: ________________________________________ Code # _________ Summer Session 2008 ID: X 1 UCSD Physics 2B Practice Exam 5 Inductance & AC Circuits READ ME !!! Helpful Hints: Do this exam a few times. .. Once without the answers, Once after seeing the solutions & Once again with your formula sheet This is a good time to add formulas/constants to your sheet. Remember, this is a timed exam. .. work swiftly so you have time to check your answers. 1. How much does the maximum emf produced by a generator (a rotating coil) change if the period of rotation is doubled ? A. It is the same B. It is doubled C. It is quadrupled D. It is halved E. It is quartered 2. A 200-turn coil is rotating in a magnetic field of magnitude B = 0.250 T at a frequency of f = 60.0 Hz . The area of the coil A = 5.00 × 10 2 m 2 . What is the maximum emf in the coil? A. 150 V B. 450 V C. 942 V D. 240 V 3. The rms value of house voltage in much of Europe is 220 V. What is the peak voltage? A. 440 V B. 310 V C. 220 V D. 160 V E. 120 V 4. If you plug a 1200W heater and a 600W toaster into 110V electrical outlets, what total rms current would these two appliances draw if the wiring is in parallel? (it always is!) A. 5.45 A B. 10.9 A C. 11.6 A D. 16.4 A E. 23.1 A
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Name: ________________________ ID: A 2 5. If you double the rms voltage in an AC circuit, the peak voltage A. increases by a factor of 2 B. decreases by a factor of 2 C. increases by a factor of 2 D. decreases by a factor of 2 E. does not change 6. Your house is wired for 220 V and you want to draw no more than 17 kW . What circuit breaker do you need in order not to shut off the power? Note : If circuit breakers are rated in 10A increments, e.g., 10A, 20A, 30A, etc., you must choose one just above the value you calculate. A. 20 A B. 30 A C. 40 A D. 80 A E. 150 A 7. A country house draws 52.3 A with all its appliances running. A single high-voltage line delivers power at 10,500 V to a transformer on the pole which steps the voltage down to 117 V for the house. What is the current in the high-voltage power line ? Hint : voltage and current may change, but power remains fixed. A. 52.3 A B. 583 mA C. 11.1 mA D. 4.69 kA E. none of these 8. The generators at a power plant operate at 1250 V which is stepped up to 25,000 V for transmission . If the primary of the transformer has 500 windings, how many windings must the secondary have? A. 25 B. 10,000 C. 62,500 D. 250
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Name: ________________________ ID: A 3 9. In the circuit below, C = 0.13 mF and L = 270 mH. What is the natural oscillation frequency of the circuit? A. 2.85 x 10 4 rad/sec B. 1.69 x 10 2 rad/sec C. 5.93 x 10 -3 rad/sec D. 3.51 x 10 -5 rad/sec E.
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This note was uploaded on 08/23/2008 for the course PHYS 2b taught by Professor Schuller during the Summer '08 term at UCSD.

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2008PracticeExam5 - Name: _ Code # _ Summer Session 2008...

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