1. A round wire has 250,000 CM. find its diameter in inches a. ½ b. ¼ c. 1/3 d. 3/4 2. In the American wire gauge as the number of gauge increases the diameter of wire____ a. increases b. decreases c. does not change d. become twice 3. An ampere is how many ab-ampere? a. 0.1 b. 0.2 c. 0.3 d. 0.4 4. A total of 0.8 kg of water at 20 0 C is placed in a 1 kW electric kettle. How long a time in minute is needed to raise the temperature of water to 100 0 C? a. 4.46 min b. 5.32 min c. 6.34 min d. 4.56 min
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Oct 31, 2014
electrical engineering
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1. A round wire has 250,000 CM. find its diameter ininchesa. ½ b. ¼ c. 1/3 d. 3/4
2. In the American wire gauge as the number of gaugeincreases the diameter of wire____a. increases b. decreases
c. does not change d. become twice3. An ampere is how many ab-ampere?
a. 0.1 b. 0.2 c. 0.3 d. 0.44. A total of 0.8 kg of water at 200C is placed in a 1 kW
electric kettle. How long a time in minute is neededto raise the temperature of water to 1000C?a. 4.46 min b. 5.32 minc. 6.34 min d. 4.56 min
5. The resistance of a material depends upon:a. The area of cross section and the length of theconductorb. The material of the conductor, its area of crosssection and lengthc. The nature of the material of the conductor onlyd. The area of cross section of the conductor
6. A certain wire has resistance X. The resistance ofanother wire identical with the first except for havingtwice its diameter.a. X/4 b. X/2 c. 4X d. 4X/9
7. A given wire has a resistance of 17.5 Ω. If its lengthis 560 m, how much length must be cut-off from thewire in order to reduce its resistance to 12.5 Ω.a. 160 m b. 170 mc. 145 m d. 155 m
8. A copper wire of unknown length has a resistance of0.80 Ω. By successive passes through drawing dies,the length of wire is increased to 2.5 times itsoriginal value. Determine the new resistance value ofits resistance.a. 4Ω b. 3Ω c. 5Ω d. 6Ω
9. The resistance of 120 m of wires is 12 Ω. What is itsconductance?a. 0.0521 mho b. 0.083 mhoc. 6 mho d. 12 mho
10. In a five color coded resistor, the forth colorrepresent the__________?a. 4th digit b. tolerancec. Multiplier d. temperature
11. The inner part of the atom is________a. Neutron b. protonc. electron d. nucleus
12. The electron in the outer most shell of an atom iscalled as____a. Free electron b. Valence electronc. flow Electron d. outer electron
13. The resistance of a wire is 126.48 ohm at 100 0Cand 100 ohm at 300C. Determine the temperaturecoefficient of the copper at 00Ca. 0.00427 b. 0.00615c. 0.0256 d. 0.0356
14. A coil of copper wire has a resistance of 5.46 at 750C what will be its resistance at 250 C.a. 4.586 b. 4.84c. 5.02 d. 4.35
15. A kilometer of wire having a diameter of 11.7 mmand a resistance of 0.031 ohm is drawn down so thatits diameter is 5mm. what does its resistance of thebar.a. 0.013 b. 0.928c.0.017 d.0.072
16. A load of 10 ohm was connected to a 12 Voltbattery. The current drawn was 1.18 A. What wasthe internal resistance of the battery?a. 0.35 ohm b. 0.20 ohmc. 0.25 ohm d. 0.30 ohm
17. The voltage at the terminal of the battery fallsfrom 9 V on open circuit to 6V when a resistor of10 ohms is connected across its terminal. What isthe internal resistance of the battery?a. 5 ohm b. 4 ohmc. 3 ohm d. 2 ohm
18. A 100 watt bulb draws 0.833 A and a 200 wattdraws 1.666A when connected across a 120 voltsource. If the two bulbs are connected in seriesacross a 240 volt source what is the commoncurrent in amperes.a. 2.51 b. 2.11c. 1.11 d.1.52
19. The hot resistance of incandescent lamp is 10ohms and the rated voltage is 50 V. Find theseries resistance required to operate the lampfrom an 80 V supply.a. 8 ohm b. 10 ohmc. 6 ohm d. 4 ohm
20. Three resistors of 10, 12, and X ohms areconnected in parallel across the current source of8 A. Determine the value of X if this resistordraws 2.5 A?a. 10 ohm b. 11 ohmc. 12 ohm d. 13 ohm
21. A 12 V battery of 0.05 ohm resistance andanother 12 V and 0.075 ohm resistance supplypower to a 2 ohm resistor. What is the currentthrough the load?a. 5.85 A b. 5.63 Ac. 5.72 A d. 5.91 A
22. A lead storage battery is rated 12 V. If the internalresistance is 0.01 ohm, what is the maximum powerthat can be delivered to the load?a. 1200 W b. 3600 Wc. 7200 W d. 1800 W
23. A variable resistor R is connected in parallel with afixed resistor of 1.25 ohms. The combination is thenconnected across a 12 V battery with internalresistance of 0.25 ohm. Solve for the maximumpower that can be delivered to a resistor R.a. 130.20 W b. 115.52 Wc. 120.21 W d. 142.42W
24. What is the value of R in Kohms to be connected inparallel to 75 kohms to reduce the value of totalresistanc to 10 Kohms?a. 11.7 b. 15.7c. 7.5 d. 12.7
25. The resistances X,Y & Z are connected in parallelacross 120 V source. The total current of the circuit is12 A. The resistance Y is twice the value of X andresistance Z is thrice the value of X. Find the value ofY.a. 40 b. 33 c. 37 d. 25
26. A total current of 60 A is divided among 3 parallelbranches having resistances of 10, 6 & 12 ohmsrespectively. What is the current that flows throughthe branch with 10 ohm resistance?a. 17.1 A b. 28.6 Ac. 14.3 A d. 42.9 A
27. How many calories does an electric heater of 100Watts generate per second?a. 10 b. 1000c. 23.88 d. 42.25
28. How is the storage battery rated in capacity?a. Volts b. wattsc. amperes d. ampere-hour
29. A 12 volt battery has 50 amp-hr capacity. The internalresistance is 0.1 ohm. A 5 ohm load is connected for 5hours. How many ampere-hour are still left?a. 28.51 b. 41.24c. 38.23 d. 35.92
30. Three resistors of 10, 20 & 30 ohms respectively areconnected in delta. Determine their equivalent resistancein WYE connection.a. 3.33, 10, 5 Ω b. 5, 10, 15 Ωc. 6, 8, 10 Ω d. 3.33, 5, 8 Ω
31. The length of time between a point in one cycle to thesame point of the next cycle of an AC wave is the______?a. Frequency b. periodc. magnitude d. polarity
32. In an experiment, a sinusoidal wave form is observed tocomplete 8 cycles in 25 msec. Determine the frequency ofthe wave form.a. 320 Hz b. 200 Hzc. 40 Hz d. 64 Hz
33. The wavelength of international distress of frequency is600 m. What is the equivalent frequency in kHz?a. 200 b. 300 Hzc. 400 Hz d. 500 Hz
34. If emf in a circuit is given by e = 100 sin 628t, themaximum value of the voltage and frequency is______?a. 100 V, 50 Hz b. 100 V, 100 Hzc. 50 V, 50 Hz d. 50 V, 100 Hz
35. A sinusoidal voltage wave has an RMS value of 70.71 Vand a frequency of 60 Hz. Determine the value of thevoltage 0.0014 second after it crosses the ωt axis.a. 70.71 b. 100 Vc. 50 V d. 141.42 V
36. The resistance of the conductor increases whena. Its length increasesb. Its area increasec. Both length and area increasesd. specific resistance kept constant
37. The curve representing ohm’s law isa. Parabola b. linearc. sine function d. hyperbola
38. The voltage applied across an electric presswas reduced by 50%. The power consumed by thepress will be reduced bya. 25% b. 50%c. 75% d. 30%
39. Magnetic lines of force are calleda. Hysteresis b. currentc. flux d. magneto motive force
40. Permeance is analogous toa. Conductance b. resistancec. reluctance d. none of these
41. The energy stored in an inductor is given bya. 2LI2 joules b. 0 joulesc. Nϕ/I joules d. ½ LI2 joules
42. No voltage will induced in a coil when current ‘I’ isa. Switched on b. switched offc. reduced d. constant
43. Whenever a conductor cuts magnetic flux, an emf isinduced in that conductor. This statement is known asa. Joule’s Law b. Faraday’s Lawc. Coulomb’s Law d. Newton’s Law
44. While comparing magnetic circuit and electric circuits,the flux of magnetic circuit is compared with w/cparameter of electric circuit?a. Emf b. resistancec. current d. conductance
45. A natural magnet is calleda. Steel b. lodestonec. magnetism d. soft iron
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