Practice Exam Spring 2009

Practice Exam Spring 2009 - Name: _ Code # _ Monday,...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
Name: ______________________________________ Code # _________ Monday, September 4, 2006 ID: X 4 UCSD Physics 2B Practice Exam 5 Inductors & AC Circuits READ ME !!! This Practice Exam has multiple examples of certain problems. Helpful Hints: Do this exam a few times. .. Once without the answers, Once after seeing the solutions & Once again with your formula 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 rotates in a magnetic field of magnitude 0.25 T at a frequency of 60 Hz. The area of the coil is 0.050 m 2 . What is the maximum emf in the coil? A. 150 V B. 450 V C. 900 V D. 940 V E. 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
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Name: ________________________ ID: X 2 4. If you were to plug a 1200W heater and a 600W toaster into a 110V electrical outlet, 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 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. The generators at a power plant operate at 1250 V which is stepped up to 25,000 V for tranmission . 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 E. none of these 7. An AC line source has voltage given by Vt () = V 0 sin ω t where V 0 = 256 V and = 27.3 rad / s . What is the instananeous voltage on the line at time t = 12.6 s ? A. 26.8 V B. -256 V C. 70.6 D. -88.1 kV
Background image of page 2
Name: ________________________ ID: X 3 8. In the circuit below, C = 0.13 mF and L = 270 mH. What is the natural oscillation frequency of the circuit? C L A. 2.85 x 10 4 rad/sec B. 1.69 x 10 2 rad/sec rad/sec C. 5.93 x 10 -3 rad/sec D. 3.51 x 10 -5 rad/sec E. none of these 9. In the circuit shown below, L = 55 mH and R = 160 Ohms. What is the natural oscillation frequency of the circuit? L R A. 8.80 Hz B. 1.14 Hz C. 2.91 kHz D. 0.344 mHz E. zero
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Name: ________________________ ID: X 4 10. The LR circuit shown below has a resistance R = 25 Ω , an inductance L = 5.4 mH , and a battery of emf V = 9.0 V. After the switch S is closed, how much energy is stored in the inductance of this circuit when a steady current is acheived?
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/19/2011 for the course PHYS 2B 2b taught by Professor Hirsch during the Spring '10 term at UCSD.

Page1 / 12

Practice Exam Spring 2009 - Name: _ Code # _ Monday,...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online