Worksheets201-300
Total questions: 100
Worksheet time: 50mins
Name
Class
Date
1.
201. Which of the following is 1Amp? (Level 1)
a)
a) 1000 A
b)
b) 1000 kA
c)
c) 1000 mA
2.
202. 1 Ampere will equal to? (Level 2)
a)
a) 6.25 x 10^15 electrons per second.
b)
b) 6.25 x 10^21 electrons per millisecond.
c)
c) 6.25 x 10^18 electrons per second.
3.
203. What type of current exist in conductive liquids? (Level 2)
a)
a) Electron current
b)
b) Ion and electron currents
c)
c) Ion currents
4.
204. An electric current is a flow of (Level 2)
a)
a) Electrons from a positively charged area to a negatively charged area
b)
b) Protons from a positively charged area to a negatively charged area
c)
c) Electrons from a negatively charged area to a positively charged area
5.
205. Which types of material contain positive charges? (Level 1)
a)
a) Nylon, Silver, Copper, lead
b)
b) Sulfur, Polyester, Silicon, Celluloid
c)
c) Glass, human hair, silk, lead, aluminium
6.
206. What will happen when rubbing glass rod and silk? (Level 1)
a)
a) Nothing happens
b)
b) Glass rods receive electrons and become negatively charged
c)
c) Glass rods give up electrons and become positively charged
7.
207. A piezoelectric device generates electricity through (Level 1)
a)
a) Pressure
b)
b) Friction
c)
c) Light
8.
208. The direction of the induced voltage depends on (Level 1)
a)
a) The movement of the magnetic field
b)
b) The movement direction as well as the direction of the magnetic field
c)
c) The voltage applied
9.
209. Which direction will the electron of the conductor be caused to deflect during induction process? (Level 1)
a)
a) Lateral
b)
b) Longitudinal
c)
c) Freely move
10.
210. What is the main function of photocells? (Level 1)
a)
a) Provide heat for conductor
b)
b) Generators of electrical voltage
c)
c) Produce energy for transmitting voltage
11.
211. Photocells are also regarded as (Level 1)
a)
a) Opto-electronic components
b)
b) Transducers
c)
c) Capacitors
12.
212. What happens during the breaking up process of the crystal bonding? (Level 1)
a)
a) Current and electromagnetic are born
b)
b) An electron and hole are released
c)
c) Nothing happens
13.
213. The process of breaking up crystal bonding is caused by (Level 1)
a)
a) Protons
b)
b) High voltage
c)
c) Photons
14.
214. When belonging to the galvanic cell, primary cells are knowns as (Level 1)
a)
a) Batteries
b)
b) Heat supply
c)
c) Electromagnetic field
15.
215. What is the most popular combination of batteries? (Level 1)
a)
a) Copper-oxygen
b)
b) Lead-Helium
c)
c) Zinc-carbon
16.
216. What does every battery generally contain? (Level 1)
a)
a) Plates and an acid which has a certain resistance
b)
b) Electromagnetic field
c)
c) Surplus voltage and current
17.
217. Where can secondary cells be used? (Level 1)
a)
a) Cars, aircraft, laptop
b)
b) Thermometer
c)
c) Thyristor
18.
218. Design and Principle of Operation thermocouples? (Level 1)
a)
a) Two different metals (e.g. copper and iron) are connected at one end, a voltage is generated between the two free ends when temperatures increase
b)
b) Different metals have different numbers of free electrons and therefore a different electron density.
c)
c) Different metals have different numbers of free electrons and therefore a different electron density; Two different metals (e.g. copper and iron) are connected at one end, a voltage is generated between the two free ends when temperatures increase
19.
219. What is thermocouple application for? (Level 1)
a)
a) Thermocouples are used to measure temperatures (temperature range from−200° C to 2300° C) e.g. for remote measurements of temperatures at hard to reach places, e.g. ovens and windings.
b)
b) Thermocouples are used to measure temperatures (temperature range from−200° C to 2300° C). In aviation, thermocouples are mainly used to measure exhaust gas temperatures of engines.
c)
c) Thermocouples are mainly used to measure exhaust gas temperatures of engines
20.
220. A primary cell (Level 2)
a)
a) Can be recharged
b)
b) Cannot be recharged
c)
c) Can be recharged but in a few times
21.
221. The voltage of a secondary cell is (Level 2)
a)
a) Determined by the active materials on the plates
b)
b) Determined by the number of plates
c)
c) Determined by the area of the plates
22.
222. Lead Batteries can be recharged by using (Level 2)
a)
a) AC current
b)
b) DC current
c)
c) Both AC current and DC current
23.
223. What is the main advantage of connecting power sources in series? (Level 2)
a)
a) Increase induction
b)
b) Increase the voltage
c)
c) Increase the resistance
24.
224. How batteries are connected to constantly remain voltage? (Level 2)
a)
a) Series
b)
b) Parallel
c)
c) Perpendicular
25.
225. Ohm's law states that (Level 1)
a)
a) Voltage= current divided by resistance
b)
b) Resistance= current divided by voltage
c)
c) Current= voltage divided by resistance
26.
226. The resistance given by Ohm's Law (Level 1)
a)
a) Does not depend on the voltage applied
b)
b) Depends on the current applied
c)
c) Depends on voltages and currents applied
27.
227. If the resistance of an electrical circuit is increased (Level 1)
a)
a) The current will increase
b)
b) The voltage will increase
c)
c) The voltage will decrease
28.
228. If the voltage across a resistor is doubled (Level 1)
a)
a) The current is halved
b)
b) The current is doubled
c)
c) The current is tripled
29.
229. If voltage is 100V, resistance is 25 ohms, what is the current? (Level 1)
a)
a) 2A
b)
b) 1A
c)
c) 4A
30.
230. Using Ohm's law (Level 2)
a)
a) Current is directly proportional to the voltage
b)
b) Current is inversely proportional to the resistance
c)
c) Resistance directly proportional to the voltage
31.
231. What is the potential difference of a circuit which has a 40mA current and a 1 kilo-ohm resistance? (Level 2)
a)
a) 40V
b)
b) 400V
c)
c) 4000V
32.
232. The current flowing through a circuit can be increased to four times its original value by (Level 2)
a)
a) Doubling the applied voltage and doubling the resistance
b)
b) Doubling the applied voltage and halving the resistance
c)
c) Halving the applied voltage and halving the resistance
33.
233. In the circuit shown the 24 volt battery has the ammeter indicates a current of 12 amperes. The value of the load resistance is. (Level 2)
a)
a) 2 ohms
b)
b) 4 ohms
c)
c) 8 ohms
34.
234. A circuit has a current flow of 6A. If the voltage is trebled, the new current will be. (Level 2)
a)
a) 6A
b)
b) 2A
c)
c) 18A
35.
235. Which material is known to have low specific resistance? (Level 1)
a)
a) Copper
b)
b) Wool
c)
c) Plastic
36.
236. What is used to compare the "weight" of the resistor? (Level 1)
a)
a) Wheatstone bridge
b)
b) Millivoltmeter
c)
c) Ammeter
37.
237. What are the main material used for NTC resistors? (Level 1)
a)
a) Platinum, nickel, cobalt
b)
b) Platinum, copper, iron, nickel
c)
c) Aluminium, copper, cobalt
38.
238. The increase in the temperature of the NTC resistors will lead to (Level 1)
a)
a) The increase in the conductivity of the material
b)
b) The increase in electromotive force
c)
c) The increase in electromagnetic force of the material
39.
239. When the resistors are connected in series, the total resistance will be (Level 1)
a)
a) R= R1+R2+R3+…
b)
b) R=R1xR2xR3x…
c)
c) R= (R1xR2xR3x…)/(R1+R2+R3+…)
40.
240. The voltage in a series circuit (Level 1)
a)
a) Is the same in each component
b)
b) Is different in each component
c)
c) Is less than it would be in a parallel circuit
41.
241. Total resistance in parallel for R1 and R2 is (Level 1)
a)
a) 1/RT = (R1 x R2) ÷ (R1 + R2)
b)
b) RT = 1/R1 + 1/R2
c)
c) 1/RT = 1/R1 + 1/R2
42.
242. The formula for resistance in series is (Level 1)
a)
a) RT = R1 + R2 + R3...RN
b)
b) RT= R1 x R2 x R3...RN
c)
c) 1/RT= 1/ (R1 x R2 x R3 ...RN)
43.
243. The 4th colored band on a resistor represents the (Level 1)
a)
a) Tolerance
b)
b) Multiplier
c)
c) Reliability or temperature coefficient
44.
244. What is the combined value of resistances of 4 ohm and 6 ohm connected in parallel? (Level 1)
a)
a) 24 ohms
b)
b) 2.4 ohms
c)
c) 0.24 ohms
45.
245. A 47 kilohm resistor has the following color code (Level 2)
a)
a) Yellow, violet, orange
b)
b) Orange, violet, red
c)
c) Red, orange, yellow
46.
246. A 47K Ohm resistor with a 10% tolerance has the following color code: (Level 2)
a)
a) Orange, violet, red, gold
b)
b) Red, orange, yellow, silver
c)
c) Yellow, violet, orange, silver
47.
247. What is the ideal condition for metals to conduct in PTC resistors (Level 2)
a)
a) High temperature
b)
b) High current and voltage
c)
c) Low temperature
48.
248. How many amperes will a 28-volt generator be required to supply to a circuit containing five lamps in parallel, three of which have a resistance of 6 ohms each and two of which have a resistance of 5 ohms each? (Level 2)
a)
a) 25.23 amperes
b)
b) 1 amperes
c)
c) 1.1111 amperes
49.
249. Which of these will cause the resistance of a conductor to decrease (Level 2)
a)
a) Decrease the length or increase the cross-sectional area
b)
b) Decrease the length or the cross-sectional area
c)
c) Increase the length or decrease the cross-sectional area
50.
250. A potentiometer varies (Level 2)
a)
a) Voltage
b)
b) Current
c)
c) Resistance
51.
251. Six resistors each of 6 ohms would be (Level 2)
a)
a) 36 ohms in parallel
b)
b) 1 ohm in series
c)
c) 1 ohm in parallel
52.
252. In a circuit containing three resistors of equal value connected in parallel, one resistor goes open circuit. The current in the other two resistors will (Level 2)
a)
a) Increase
b)
b) Decrease
c)
c) Remain the same
53.
253. The total current flowing in a circuit of 200 lamps in parallel, each of a resistance of 400 ohm and connected across an input of 100 volts is (Level 2)
a)
a) 25 amps
b)
b) 40 amps
c)
c) 50 amps
54.
254. In general, increasing the cross sectional area of an electrical cable (Level 2)
a)
a) Enables it to carry more voltage
b)
b) Enables it to carry more current
c)
c) Increase its resistance
55.
255. A 10 V battery supplies a resistive load of 10 ohms for 1 minute. What is the power supplied? (Level 1)
a)
a) 100 W
b)
b) 10 VA
c)
c) 10 W
56.
256. What is the power dissipated in a 500 ohm resistor with a 3A flow? (Level 1)
a)
a) 4.5 kW
b)
b) 1.5 kW
c)
c) 750 kW
57.
257. The power in a circuit when voltage and resistance is given can be found by? (Level 1)
a)
a) U*R
b)
b) U*U*R
c)
c) U*U / R
58.
258. A DC circuit containing a total resistance of 100 ohms has a current flow of 250 mA. The power dissipated in the circuit is? (Level 2)
a)
a) 0.4 W
b)
b) 5 W
c)
c) 6.25 W
59.
259. A 500 ohm resistor carries a 3 amp current. What is the power dissipated? (Level 1)
a)
a) 500 W
b)
b) 4.5 kW
c)
c) 5 kW
60.
260. How much power must a 24-volt generator furnish to a system which contains the following series loads? 5 ohm, 3 ohm and 12 ohm (Level 2)
a)
a) 42 W
b)
b) 28.8 W
c)
c) 45 W
61.
261. Which requires the most electrical power during operation? (Level 2)
a)
a) A 12-volt motor requiring 8 amperes
b)
b) Four 30-watt lamps in a 12-volt parallel circuit.
c)
c) Two lights requiring 3 amperes each in a 24volt parallel system.
62.
262. A lamp has eight light bulbs. They have a power consumption of 50 watts each. The voltage is 230 volts, What is the current in the lamp? (Level 2)
a)
a) 1,74 A
b)
b) 2,74 A
c)
c) 0.125
63.
263. An electric motor has a power consumption of 500 W (according to the nameplate) and the efficiency is 90 %. Therefore the power delivered at the shaft is? (Level 1)
a)
a) 400 W
b)
b) 450 W
c)
c) 500 W
64.
264. A aircraft passenger’s mass is 80 kg. The speed of the aircraft is 864 km/h. How much kinetic Energy? (Level 2)
a)
a) 2304 kNm
b)
b) 2403 kNm
c)
c) 2504 kNm
65.
265. Which statement is correct? (Level 2)
a)
a) A capacitor with double the area and double the dielectric thickness will have double the capacitance.
b)
b) A capacitor with double the area and double the dielectric thickness will have the same capacitance.
c)
c) A capacitor with double the area and double the dielectric thickness will have half the capacitance.
66.
266. If the distance between the two plates of a capacitor is reduced, what will be the effect? (Level 2)
a)
a) Capacitance increases.
b)
b) Capacitance decreases.
c)
c) Capacitance is unaffected.
67.
267. The voltage rating of a capacitor is? (Level 2)
a)
a) The min voltage required to charge.
b)
b) The normal operating voltage
c)
c) The max voltage that can be constantly applied
68.
268. Three capacitors 10 microfarads, 10 nanofarads and 10 millifarads are connected in parallel. What is the total capacitance? (Level 2)
a)
a) 10.01001 millifarads.
b)
b) 111 millifarads.
c)
c) 1.001001 millifarads.
69.
269. What must you do to make a 3 F capacitor circuit into a 2 F circuit? (Level 1)
a)
a) Put a 2 F capacitor in parallel.
b)
b) Put a 6 F capacitor in series.
c)
c) Put a 1 F capacitor in series.
70.
270. Three 12 µ(micro)F capacitors are in series. The total capacitance is (Level 1)
a)
a) 12 µ(micro)F.
b)
b) 36 µ(micro)F.
c)
c) 4 µ(micro)F.
71.
271. The amount of charge depends on (Level 1)
a)
a) The plate size, the distance between the plates and on the applied voltage
b)
b) The plate size and the distance between the plates
c)
c) The distance between the plates and on the applied voltage
72.
272. Which statement is correct? (Level 1)
a)
a) The capacity depends on area of the plates, Distance between the plates
b)
b) The capacity depends on area of the plates, Distance between the plates, Dielectric
c)
c) The capacity depends on distance between the plates, Dielectric
73.
273. When different rated capacitors are connected in parallel in a circuit, the total capacitance is? (Level 1)
a)
a) Less than the capacitance of the lowest rated capacitor.
b)
b) Equal to the capacitance of the highest rated capacitor.
c)
c) Equal to the sum of all the capacitances.
74.
274. When two capacitors are connected in series. (Level 2)
a)
a) The charge stored on each is inversely proportional to the voltage across it.
b)
b) The charge stored on each is the same.
c)
c) The charge stored on each is directly proportional to its capacitance.
75.
275. Which of the following materials is easiest to magnetize? (Level 1)
a)
a) Copper
b)
b) Iron
c)
c) Nickel
76.
276. Which statement is correct? (Level 2)
a)
a) Aluminium and platinum are ferromagnets
b)
b) Aluminium and platinum are paramagnets
c)
c) Aluminium and platinum are diamagnets
77.
277. To find which end of an electromagnet is the north pole, use the (Level 2)
a)
a) Fleming's Left Hand Rule.
b)
b) Cork Screw Rule.
c)
c) Right Hand Clasp Rule.
78.
278. Of the following which pair of materials would most readily become magnetized? (Level 2)
a)
a) Iron and steel.
b)
b) Copper and steel.
c)
c) Nickel and bronze.
79.
279. Ferromagnetic materials have a relative permeability (Level 2)
a)
a) Which is much higher than the permeability of the vacuum.
b)
b) Which is much smaller than the permeability of the vacuum.
c)
c) Which is nearly the same as the permeability of the vacuum.
80.
280. Paramagnetic materials have a permeability (Level 2)
a)
a) Which is much higher than the permeability of the vacuum.
b)
b) Which is much smaller than the permeability of the vacuum.
c)
c) Which is nearly the same as the permeability of air or the vacuum
81.
281. Diamagnetic materials have a permeability (Level 2)
a)
a) Which is much higher than the permeability of the vacuum.
b)
b) Which is much smaller than the permeability of the vacuum
c)
c) Which is nearly the same as the permeability of air or the vacuum
82.
282. The symbol for the magnetomotive force is (Level 1)
a)
a) Dental
b)
b) Theta
c)
c) Beta
83.
283. The magnetomotive force is measured in (Level 1)
a)
a) Amperes
b)
b) V/A
c)
c) Mu
84.
284. The symbol for the magnetic field strength is (Level 1)
a)
a) A
b)
b) B
c)
c) H
85.
285. The magnetic field strength is (Level 1)
a)
a) A/m
b)
b) B/m
c)
c) H/m
86.
286. The symbol for permeability is (Level 1)
a)
a) Θ (theta)
b)
b) µ (mu)
c)
c) Φ (phi)
87.
287. What are main functions of proximity switches? (Level 2)
a)
a) Monitor the position of the landing gear and the undercarriage door.
b)
b) To measure deflect angle of control surface
c)
c) To measure deflect angle of landing gear
88.
288. What is definition of proximity switches? (Level 2)
a)
a) A target which connected to the sensor unit.
b)
b) A sensor which can detect an object coming nearer by the change of the magnetic field
c)
c) A sensor which can detect an object coming far by the change of the magnetic field
89.
289. Which statement is correct? (Level 1)
a)
a) Zinc is an example of a ferromagnets Material
b)
b) Zinc is an example of a paramagnetic material
c)
c) Zinc is an example of a diamagnets Material
90.
290. Which statement is correct? (Level 1)
a)
a) Cobalt is an example of a ferromagnets Material
b)
b) Cobalt is an example of a paramagnetic material
c)
c) Cobalt is an example of a diamagnets Material
91.
291. Which statement is correct? (Level 1)
a)
a) Platinum is an example of a ferromagnets Material
b)
b) Platinum is an example of a paramagnetic material
c)
c) Platinum is an example of a diamagnets Material
92.
292. Having two conductors parallel, if the direction of the current running the conductors is the same: (Level 2)
a)
a) The wires attract
b)
b) The wires attract then repel
c)
c) The wires repel
93.
293. Having two conductors parallel, if the direction of the current running the conductors is different: (Level 2)
a)
a) The wires attract
b)
b) The wires attract then repel
c)
c) The wires repel
94.
294. The symbol for the magnetic flux density is: (Level 1)
a)
a) B
b)
b) T
c)
c) H
95.
295. The symbol for inductance is (Level 1)
a)
a) L
b)
b) H
c)
c) B
96.
296. The inductance is measured in (Level 1)
a)
a) µ (mu)
b)
b) Henry (H)
c)
c) Φ (phi).
97.
297. According to Faraday the induced voltage is calculated by (Level 2)
a)
a) The change of the number of windings
b)
b) The magnetic flux within a certain span of time
c)
c) The change of the magnetic flux within a certain span of time
98.
298. How many items the induced voltage depends on (Level 2)
a)
a) 1
b)
b) 2
c)
c) 3
99.
299. Two inductive coils are placed in close proximity with each other at 90 degrees. The number of flux linkages is (Level 2)
a)
a) Maximum negative
b)
b) 0
c)
c) Maximum positive
100.
300. 1 Volt is produced when a current of 1 Amp per second is varied in a coil'. This is a definition of (Level 1)
a)
a) 1 Henry
b)
b) 1 Ampere per metre
c)
c) 1 Coulomb per second
100 %
