Quiz about 201-300

Question 1

201. Which of the following is 1Amp? (Level 1)

Accepted Answer

c) 1000 mA

Answer

a) 1000 A

Answer

b) 1000 kA

Question 2

203. What type of current exist in conductive liquids? (Level 2)

Accepted Answer

c) Ion currents

Answer

a) Electron current

Answer

b) Ion and electron currents

Question 3

204. An electric current is a flow of (Level 2)

Accepted Answer

c) Electrons from a negatively charged area to a positively charged area

Answer

a) Electrons from a positively charged area to a negatively charged area

Answer

b) Protons from a positively charged area to a negatively charged area

Question 4

205. Which types of material contain positive charges? (Level 1)

Accepted Answer

c) Glass, human hair, silk, lead, aluminium

Answer

a) Nylon, Silver, Copper, lead

Answer

b) Sulfur, Polyester, Silicon, Celluloid

Question 5

206. What will happen when rubbing glass rod and silk? (Level 1)

Accepted Answer

c) Glass rods give up electrons and become positively charged

Answer

a) Nothing happens

Answer

b) Glass rods receive electrons and become negatively charged

Question 6

207. A piezoelectric device generates electricity through (Level 1)

Accepted Answer

a) Pressure

Answer

b) Friction

Answer

c) Light

Question 7

208. The direction of the induced voltage depends on (Level 1)

Accepted Answer

b) The movement direction as well as the direction of the magnetic field

Answer

a) The movement of the magnetic field

Answer

c) The voltage applied

Question 8

209. Which direction will the electron of the conductor be caused to deflect during induction process? (Level 1)

Accepted Answer

b) Longitudinal

Answer

a) Lateral

Answer

c) Freely move

Question 9

210. What is the main function of photocells? (Level 1)

Accepted Answer

b) Generators of electrical voltage

Answer

a) Provide heat for conductor

Answer

c) Produce energy for transmitting voltage

Question 10

211. Photocells are also regarded as (Level 1)

Accepted Answer

a) Opto-electronic components

Answer

b) Transducers

Answer

c) Capacitors

Question 11

212. What happens during the breaking up process of the crystal bonding? (Level 1)

Accepted Answer

b) An electron and hole are released

Answer

a) Current and electromagnetic are born

Answer

c) Nothing happens

Question 12

213. The process of breaking up crystal bonding is caused by (Level 1)

Accepted Answer

c) Photons

Answer

a) Protons

Answer

b) High voltage

Question 13

214. When belonging to the galvanic cell, primary cells are knowns as (Level 1)

Accepted Answer

a) Batteries

Answer

b) Heat supply

Answer

c) Electromagnetic field

Question 14

215. What is the most popular combination of batteries? (Level 1)

Accepted Answer

c) Zinc-carbon

Answer

a) Copper-oxygen

Answer

b) Lead-Helium

Question 15

216. What does every battery generally contain? (Level 1)

Accepted Answer

a) Plates and an acid which has a certain resistance

Answer

b) Electromagnetic field

Answer

c) Surplus voltage and current

Question 16

217. Where can secondary cells be used? (Level 1)

Accepted Answer

a) Cars, aircraft, laptop

Answer

b) Thermometer

Answer

c) Thyristor

Question 17

218. Design and Principle of Operation thermocouples? (Level 1)

Accepted Answer

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

Answer

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

Answer

b) Different metals have different numbers of free electrons and therefore a different electron density.

Question 18

220. A primary cell (Level 2)

Accepted Answer

b) Cannot be recharged

Answer

a) Can be recharged

Answer

c) Can be recharged but in a few times

Question 19

221. The voltage of a secondary cell is (Level 2)

Accepted Answer

a) Determined by the active materials on the plates

Answer

b) Determined by the number of plates

Answer

c) Determined by the area of the plates

Question 20

222. Lead Batteries can be recharged by using (Level 2)

Accepted Answer

b) DC current

Answer

a) AC current

Answer

c) Both AC current and DC current

Question 21

223. What is the main advantage of connecting power sources in series? (Level 2)

Accepted Answer

b) Increase the voltage

Answer

a) Increase induction

Answer

c) Increase the resistance

Question 22

224. How batteries are connected to constantly remain voltage? (Level 2)

Accepted Answer

b) Parallel

Answer

a) Series

Answer

c) Perpendicular

Question 23

225. Ohm's law states that (Level 1)

Accepted Answer

c) Current= voltage divided by resistance

Answer

a) Voltage= current divided by resistance

Answer

b) Resistance= current divided by voltage

Question 24

226. The resistance given by Ohm's Law (Level 1)

Accepted Answer

a) Does not depend on the voltage applied

Answer

b) Depends on the current applied

Answer

c) Depends on voltages and currents applied

Question 25

227. If the resistance of an electrical circuit is increased (Level 1)

Accepted Answer

a) The current will increase

Answer

b) The voltage will increase

Answer

c) The voltage will decrease

Question 26

228. If the voltage across a resistor is doubled (Level 1)

Accepted Answer

b) The current is doubled

Answer

a) The current is halved

Answer

c) The current is tripled

Question 27

229. If voltage is 100V, resistance is 25 ohms, what is the current? (Level 1)

Accepted Answer

c) 4A

Answer

a) 2A

Answer

b) 1A

Question 28

230. Using Ohm's law (Level 2)

Accepted Answer

a) Current is directly proportional to the voltage

Answer

b) Current is inversely proportional to the resistance

Answer

c) Resistance directly proportional to the voltage

Question 29

231. What is the potential difference of a circuit which has a 40mA current and a 1 kilo-ohm resistance? (Level 2)

Accepted Answer

a) 40V

Answer

b) 400V

Answer

c) 4000V

Question 30

232. The current flowing through a circuit can be increased to four times its original value by (Level 2)

Accepted Answer

b) Doubling the applied voltage and halving the resistance

Answer

a) Doubling the applied voltage and doubling the resistance

Answer

c) Halving the applied voltage and halving the resistance

Question 31

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)

Accepted Answer

a) 2 ohms

Answer

b) 4 ohms

Answer

c) 8 ohms

Question 32

234. A circuit has a current flow of 6A. If the voltage is trebled, the new current will be. (Level 2)

Accepted Answer

c) 18A

Answer

a) 6A

Answer

b) 2A

Question 33

235. Which material is known to have low specific resistance? (Level 1)

Accepted Answer

a) Copper

Answer

b) Wool

Answer

c) Plastic

Question 34

236. What is used to compare the "weight" of the resistor? (Level 1)

Accepted Answer

a) Wheatstone bridge

Answer

b) Millivoltmeter

Answer

c) Ammeter

Question 35

237. What are the main material used for NTC resistors? (Level 1)

Accepted Answer

a) Platinum, nickel, cobalt

Answer

b) Platinum, copper, iron, nickel

Answer

c) Aluminium, copper, cobalt

Question 36

238. The increase in the temperature of the NTC resistors will lead to (Level 1)

Accepted Answer

a) The increase in the conductivity of the material

Answer

b) The increase in electromotive force

Answer

c) The increase in electromagnetic force of the material

Question 37

240. The voltage in a series circuit (Level 1)

Accepted Answer

b) Is different in each component

Answer

a) Is the same in each component

Answer

c) Is less than it would be in a parallel circuit

Question 38

242. The formula for resistance in series is (Level 1)

Accepted Answer

a) RT = R1 + R2 + R3...RN

Answer

b) RT= R1 x R2 x R3...RN

Answer

c) 1/RT= 1/ (R1 x R2 x R3 ...RN)

Question 39

243. The 4th colored band on a resistor represents the (Level 1)

Accepted Answer

a) Tolerance

Answer

b) Multiplier

Answer

c) Reliability or temperature coefficient

Question 40

244. What is the combined value of resistances of 4 ohm and 6 ohm connected in parallel? (Level 1)

Accepted Answer

b) 2.4 ohms

Answer

a) 24 ohms

Answer

c) 0.24 ohms

Question 41

245. A 47 kilohm resistor has the following color code (Level 2)

Accepted Answer

a) Yellow, violet, orange

Answer

b) Orange, violet, red

Answer

c) Red, orange, yellow

Question 42

246. A 47K Ohm resistor with a 10% tolerance has the following color code: (Level 2)

Accepted Answer

c) Yellow, violet, orange, silver

Answer

a) Orange, violet, red, gold

Answer

b) Red, orange, yellow, silver

Question 43

247. What is the ideal condition for metals to conduct in PTC resistors (Level 2)

Accepted Answer

b) High current and voltage

Answer

a) High temperature

Answer

c) Low temperature

Question 44

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)

Accepted Answer

a) 25.23 amperes

Answer

b) 1 amperes

Answer

c) 1.1111 amperes

Question 45

249. Which of these will cause the resistance of a conductor to decrease (Level 2)

Accepted Answer

c) Increase the length or decrease the cross-sectional area

Answer

a) Decrease the length or increase the cross-sectional area

Answer

b) Decrease the length or the cross-sectional area

Question 46

250. A potentiometer varies (Level 2)

Accepted Answer

c) Resistance

Answer

a) Voltage

Answer

b) Current

Question 47

251. Six resistors each of 6 ohms would be (Level 2)

Accepted Answer

a) 36 ohms in parallel

Answer

b) 1 ohm in series

Answer

c) 1 ohm in parallel

Question 48

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)

Accepted Answer

a) Increase

Answer

b) Decrease

Answer

c) Remain the same

Question 49

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)

Accepted Answer

c) 50 amps

Answer

a) 25 amps

Answer

b) 40 amps

Question 50

254. In general, increasing the cross sectional area of an electrical cable (Level 2)

Accepted Answer

b) Enables it to carry more current

Answer

a) Enables it to carry more voltage

Answer

c) Increase its resistance

Question 51

255. A 10 V battery supplies a resistive load of 10 ohms for 1 minute. What is the power supplied? (Level 1)

Accepted Answer

c) 10 W

Answer

a) 100 W

Answer

b) 10 VA

Question 52

256. What is the power dissipated in a 500 ohm resistor with a 3A flow? (Level 1)

Accepted Answer

a) 4.5 kW

Answer

b) 1.5 kW

Answer

c) 750 kW

Question 53

257. The power in a circuit when voltage and resistance is given can be found by? (Level 1)

Accepted Answer

c) U*U / R

Answer

a) U*R

Answer

b) U*U*R

Question 54

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)

Accepted Answer

c) 6.25 W

Answer

a) 0.4 W

Answer

b) 5 W

Question 55

259. A 500 ohm resistor carries a 3 amp current. What is the power dissipated? (Level 1)

Accepted Answer

b) 4.5 kW

Answer

a) 500 W

Answer

c) 5 kW

Question 56

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)

Accepted Answer

b) 28.8 W

Answer

a) 42 W

Answer

c) 45 W

Question 57

261. Which requires the most electrical power during operation? (Level 2)

Accepted Answer

c) Two lights requiring 3 amperes each in a 24volt parallel system.

Answer

a) A 12-volt motor requiring 8 amperes

Answer

b) Four 30-watt lamps in a 12-volt parallel circuit.

Question 58

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)

Accepted Answer

a) 1,74 A

Answer

b) 2,74 A

Answer

c) 0.125

Question 59

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)

Accepted Answer

b) 450 W

Answer

a) 400 W

Answer

c) 500 W

Question 60

265. Which statement is correct? (Level 2)

Accepted Answer

b) A capacitor with double the area and double the dielectric thickness will have the same capacitance.

Answer

a) A capacitor with double the area and double the dielectric thickness will have double the capacitance.

Answer

c) A capacitor with double the area and double the dielectric thickness will have half the capacitance.

Question 61

266. If the distance between the two plates of a capacitor is reduced, what will be the effect? (Level 2)

Accepted Answer

a) Capacitance increases.

Answer

b) Capacitance decreases.

Answer

c) Capacitance is unaffected.

Question 62

267. The voltage rating of a capacitor is? (Level 2)

Accepted Answer

c) The max voltage that can be constantly applied

Answer

a) The min voltage required to charge.

Answer

b) The normal operating voltage

Question 63

268. Three capacitors 10 microfarads, 10 nanofarads and 10 millifarads are connected in parallel. What is the total capacitance? (Level 2)

Accepted Answer

a) 10.01001 millifarads.

Answer

b) 111 millifarads.

Answer

c) 1.001001 millifarads.

Question 64

269. What must you do to make a 3 F capacitor circuit into a 2 F circuit? (Level 1)

Accepted Answer

b) Put a 6 F capacitor in series.

Answer

a) Put a 2 F capacitor in parallel.

Answer

c) Put a 1 F capacitor in series.

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