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395 lines
6.4 KiB
Plaintext
395 lines
6.4 KiB
Plaintext
% FILENAME = N6.TXT
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% Resistance
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% Release version 2, January 2000
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%Question: 1
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#6.1 The total resistance in a parallel circuit:
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is always less than the smallest resistance
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depends upon the voltage drop across each branch
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could be equal to the resistance of one branch
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depends upon the applied voltage
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% ans 1
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%Question: 2
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#6.2 Two resistors are connected in parallel and are connected across a 40 volt battery. If each resistor is 1000 ohms, the total battery current is:
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40 ampere
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40 milliampere
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80 ampere
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80 milliampere
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% ans 4
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%Question: 3
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#6.3 The total current in a parallel circuit is equal to the:
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current in any one of the parallel branches
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sum of the currents through all the parallel branches
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applied voltage divided by the value of one of the resistive elements
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source voltage divided by the sum of the resistive elements
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% ans 2
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%Question: 4
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#6.4 One way to operate a 3 volt bulb from a 9 volt supply is to connect it in:
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series with the supply
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parallel with the supply
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series with a resistor
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parallel with a resistor
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% ans 3
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%Question: 5
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#6.5 You can operate this number of identical lamps, each drawing a current of 250 mA, from a 5A supply:
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50
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30
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20
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5
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% ans 3
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%Question: 6
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#6.6 Six identical 2-volt bulbs are connected in series. The supply voltage to cause the bulbs to light normally is:
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12 V
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1.2 V
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6 V
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2 V
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% ans 1
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%Question: 7
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#6.7 This many 12 volt bulbs can be arranged in series to form a string of lights to operate from a 240 volt power supply:
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12 x 240
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240 + 12
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240 - 12
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240 / 12
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% ans 4
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%Question: 8
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#6.8 Three 10,000 ohm resistors are connected in series across a 90 volt supply. The voltage drop across one of the resistors is:
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30 volt
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60 volt
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90 volt
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15.8 volt
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% ans 1
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%Question: 9
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#6.9 Two resistors are connected in parallel. R1 is 75 ohm and R2 is 50 ohm. The total resistance of this parallel circuit is:
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10 ohm
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70 ohm
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30 ohm
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40 ohm
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% ans 3
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%Question: 10
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#6.10 A dry cell has an open circuit voltage of 1.5 volt. When supplying a large current the voltage drops to 1.2 volt. This is due to the cell's:
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internal resistance
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voltage capacity
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electrolyte becoming dry
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current capacity
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% ans 1
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%Question: 11
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#6.11 A 6 ohm resistor is connected in parallel with a 30 ohm resistor. The total resistance of the combination is:
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5 ohm
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8 ohm
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24 ohm
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35 ohm
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% ans 1
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%Question: 12
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#6.12 The total resistance of several resistors connected in series is:
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less than the resistance of any one resistor
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greater than the resistance of any one resistor
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equal to the highest resistance present
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equal to the lowest resistance present
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% ans 2
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%Question: 13
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#6.13 Five 10 ohm resistors connected in series give a total resistance of:
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1 ohm
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5 ohms
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10 ohms
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50 ohms
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% ans 4
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%Question: 14
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#6.14 Resistors of 10, 270, 3900, and 100 ohm are connected in series. The total resistance is:
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9 ohm
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3900 ohm
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4280 ohm
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10 ohm
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% ans 3
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%Question: 15
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#6.15 This combination of series resistors could replace a single 120 ohm resistor:
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five 24 ohm
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six 22 ohm
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two 62 ohm
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five 100 ohm
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% ans 1
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%Question: 16
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#6.16 If a 2.2 megohm and a 100 kilohm resistor are connected in series, the total resistance is:
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2.1 megohm
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2.11 megohm
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2.21 megohm
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2.3 megohm
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% ans 4
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%Question:17
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#6.17 If ten resistors of equal value R are wired in parallel, the total resistance is:
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R
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10R
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10/R
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R/10
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% ans 4
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%Question: 18
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#6.18 The total resistance of four 68 ohm resistors wired in parallel is:
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12 ohm
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17 ohm
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34 ohm
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272 ohm
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% ans 2
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%Question: 19
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#6.19 Resistors of 68 ohm, 47 kilohm, 560 ohm and 10 ohm are connected in parallel. The total resistance is:
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less than 10 ohm
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between 68 and 560 ohm
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between 560 and and 47 kilohm
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greater than 47 kilohm
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% ans 1
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%Question: 20
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#6.20 The following resistor combination can most nearly replace a single 150 ohm resistor:
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four 47 ohm resistors in parallel
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five 33 ohm resistors in parallel
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three 47 ohm resistors in series
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five 33 ohm resistors in series
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% ans 3
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%Question: 21
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#6.21 Two 120 ohm resistors are arranged in parallel to replace a faulty resistor. The faulty resistor had an original value of:
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15 ohm
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30 ohm
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60 ohm
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120 ohm
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% ans 3
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%Question: 22
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#6.22 Two resistors are in parallel. Resistor A carries twice the current of resistor B which means that:
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A has half the resistance of B
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B has half the resistance of A
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the voltage across A is twice that across B
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the voltage across B is twice that across A
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% ans 1
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%Question: 23
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#6.23 The smallest resistance that can be made with five 1 k ohm resistors is:
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50 ohm by arranging them in series
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50 ohm by arranging them in parallel
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200 ohm by arranging them in series
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200 ohm by arranging them in parallel
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% ans 4
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%Question: 24
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#6.24 The following combination of 28 ohm resistors has a total resistance of 42 ohm:
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three resistors in series
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three resistors in parallel
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a combination of two resistors in parallel, then placed in series with another resistor
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a combination of two resistors in parallel, then placed in series with another two in parallel
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% ans 3
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%Question: 25
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#6.25 Two 100 ohm resistors connected in parallel are wired in series with a 10 ohm resistor. The total resistance of the combination is:
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60 ohms
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180 ohms
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190 ohms
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210 ohms
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% ans 1
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%Question: 26
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#6.26 A 5 ohm and a 10 ohm resistor are wired in series and connected to a 15 volt power supply. The current flowing from the power supply is:
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0.5 ampere
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1 ampere
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2 ampere
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15 ampere
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% ans 2
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%Question: 27
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#6.27 Three 12 ohm resistors are wired in parallel and connected to an 8 volt supply. The total current flow from the supply is:
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1 ampere
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2 amperes
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3 amperes
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4.5 amperes
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% ans 2
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%Question: 28
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#6.28 Two 33 ohm resistors are connected in series with a power supply. If the current flowing is 100 mA, the voltage across one of the resistors is:
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66 volt
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33 volt
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3.3 volt
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1 volt
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% ans 3
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%Question: 29
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#6.29 A simple transmitter requires a 50 ohm dummy load. You can fabricate this from:
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four 300 ohm resistors in parallel
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five 300 ohm resistors in parallel
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six 300 ohm resistors in parallel
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seven 300 ohm resistors in parallel
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% ans 3
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%Question: 30
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#6.30 Three 500 ohm resistors are wired in series. Short-circuiting the centre resistor will change the value of the network from:
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1500 ohm to 1000 ohm
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500 ohm to 1000 ohm
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1000 ohm to 500 ohm
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1000 ohm to 1500 ohm
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% ans 1
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