举一反三
- The function of direct current regulated power supply is to input an alternating current power of 220volts, so that it can output __________.( ) A: alternating current 200 volts voltage B: direct current 24 volts voltage C: direct current 200 volts voltage D: alternating current 24 volts voltage
- If the program is stored entirely in an external EPROM, what voltage must be applied to the /EA PIN on the 8051? （ ） A: 0 volts B: +10 volts--------------------------------------------------------------------------------------------------------------------------------- C: +5 volts D: -10 volts
- A nonlinear device Z has the i-v relationship shown below.This device is used in the circuit shown below, where "I" is the value of the current source.Assuming that \(I=$I1 A\), what is the value of the voltage \(v_o\) (in Volts)?Now assuming that \(I = $I2 A\), what is the value of the voltage \(v_o\) (in Volts)?Finally, for the last two parts assume that \(I = $I34 A\).What is the value of the voltage \(v_o\) (in Volts)?<br/>______
- When a BJT is in cutoff, the collector-to-emitter voltage is typically equal to _____ A: collector supply voltage B: collector current times collector resistor C: 0.3 Volts D: emitter voltage
- There are two identical batteries in series, which statement is true?( ) A: The total voltage equals the sum of the voltages of each battery. B: The total voltage equals any battery voltage. C: The total voltage equals half of one battery voltage
内容
- 0
电子系统中的高电压可能致命。 A: High voltage in the electronic system can kill you. B: High voltage in the electronic system can be deadly. C: High voltage in the electronic system can be fatal. D: High voltage in the electronic system can be lethal.
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Closed-loop control system is an automatic control system. Open-loop control system is not an automatic control system.
- 2
A nonlinear device Z has the i-v relationship shown below.This device is used in the circuit shown below, where "I" is the value of the current source.Assuming that \(I=$I1 A\), what is the value of the voltage \(v_o\) (in Volts)?Now assuming that \(I = $I2 A\), what is the value of the voltage \(v_o\) (in Volts)?<br/>______
- 3
Ohm’s Law states that current equals voltage divided by resistance. Current increases with the increase in voltage. Current decreases with the increase in resistance.
- 4
For a neutral-unearthing system, during a bolted single line-to-ground fault, the non-fault phase voltage and the fault phase voltage are ()respectively. A: phase voltage and zero B: phase voltage and line-to-line voltage C: line-to-line voltage and phase voltage D: line-to-line voltage and zero