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266 lines
3.4 KiB
Plaintext
266 lines
3.4 KiB
Plaintext
% FILENAME = N7.TXT
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% Power calculations
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% Release 3, October 2001
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%Question: 1
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#7.1 A transmitter power amplifier requires 30 mA at 300 volt. The DC input power is:
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300 watt
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9000 watt
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9 watt
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6 watt
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% ans 3
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%Question: 2
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#7.2 The DC input power of a transmitter operating at 12 volt and drawing 500 milliamp would be:
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6 watt
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12 watt
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20 watt
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500 watt
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% ans 1
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%Question: 3
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#7.3 When two 500 ohm 1 watt resistors are connected in series, the maximum total power that can be dissipated by both resistors is:
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4 watt
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2 watt
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1 watt
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1/2 watt
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% ans 2
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%Question: 4
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#7.4 When two 1000 ohm 5 watt resistors are connected in parallel, they can dissipate a maximum total power of:
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40 watt
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20 watt
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10 watt
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5 watt
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% ans 3
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%Question: 5
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#7.5 The current in a 100 kilohm resistor is 10 mA. The power dissipated is:
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1 watt
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10 watt
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100 watt
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10,000 watt
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% ans 2
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%Question: 6
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#7.6 A current of 500 milliamp passes through a 1000 ohm resistance. The power dissipated is:
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0.25 watt
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2.5 watt
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25 watt
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250 watt
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% ans 4
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%Question: 7
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#7.7 A 20 ohm resistor carries a current of 0.25 ampere. The power dissipated is:
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1.25 watt
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5 watt
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2.50 watt
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10 watt
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% ans 1
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%Question: 8
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#7.8 If 200 volt is applied to a 2000 ohm resistor, the resistor will dissipate:
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20 watt
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30 watt
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10 watt
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40 watt
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% ans 1
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%Question: 9
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#7.9 The power delivered to an antenna is 500 watt. The effective antenna resistance is 20 ohm. The antenna current is:
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25 amp
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2.5 amp
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10 amp
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5 amp
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% ans 4
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%Question: 10
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#7.10 The unit for power is the:
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ohm
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watt
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ampere
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volt
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% ans 2
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%Question: 11
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#7.11 The following two quantities should be multiplied together to find power:
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resistance and capacitance
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voltage and current
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voltage and inductance
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inductance and capacitance
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% ans 2
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%Question: 12
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#7.12 The following two electrical units multiplied together give the unit "watt":
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volt and ampere
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volt and farad
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farad and henry
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ampere and henry
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% ans 1
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%Question: 13
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#7.13 The power dissipation of a resistor carrying a current of 10 mA with 10 volt across it is:
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0.01 watt
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0.1 watt
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1 watt
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10 watt
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% ans 2
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%Question: 14
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#7.14 If two 10 ohm resistors are connected in series with a 10 volt battery, the battery load is:
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5 watt
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10 watt
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20 watt
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100 watt
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% ans 1
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%Question: 15
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#7.15 Each of 9 resistors in a circuit is dissipating 4 watt. If the circuit operates from a 12 volt supply, the total current flowing in the circuit is:
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48 ampere
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36 ampere
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9 ampere
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3 ampere
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% ans 4
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%Question: 16
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#7.16 Three 18 ohm resistors are connected in parallel across a 12 volt supply. The total power
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dissipation of the resistor load is:
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3 watt
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18 watt
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24 watt
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36 watt
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% ans 3
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%Question: 17
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#7.17 A resistor of 10 kilohm carries a current of 20 mA. The power dissipated in the resistor is:
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2 watt
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4 watt
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20 watt
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40 watt
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% ans 2
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%Question: 18
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#7.18 A resistor in a circuit becomes very hot and starts to burn. This is because the resistor is dissipating too much:
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current
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voltage
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resistance
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power
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% ans 4
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%Question: 19
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#7.19 A current of 10 ampere rms at a frequency of 50 Hz flows through a 100 ohm resistor. The
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power dissipated is:
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500 watt
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707 watt
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10,000 watt
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50,000 watt
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% ans 3
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%Question: 20
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#7.20 The voltage applied to two resistors in series is doubled. The total power dissipated will:
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increase by four times
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decrease to half
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double
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not change
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% ans 1
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