The no-load character of a 3-phase synchronous generator is the relationship between ( ).
A: no-load emf Eo; exciting current If
B: output
voltage U; load current I
C: output current I; exciting current If
D: no-load
emf Eo; load current I
A: no-load emf Eo; exciting current If
B: output
voltage U; load current I
C: output current I; exciting current If
D: no-load
emf Eo; load current I
A
举一反三
- For the of the phase compound excitation type AVR of a self-excited<br/>synchronous generator, the AC side of the rectifier is connected with<br/>capacitors delta connected. The function of these capacitor are ( <br/>). A: resistance-capacitance protection of rectifier B: compensate the generator terminal voltage change caused by the change<br/>of load current C: compensate the generator terminal voltage change due to load current<br/>phase change D: accelerated voltage built-up process
- The voltage meter and current meter on the main switchboard shows ( <br/>). A: phase voltage and phase current of generator B: line voltage and line current of generator C: line voltage and line current of crane D: line voltage and line current of shore power
- When there is a load, the main magnetic flux of the transformer is generated by ( ). A: Primary current I1 B: Secondary current I2 C: Primary current I1 andSecondary current I2 together D: Neither primary current I1 nor secondary currentI2
- Two electronic devices are connected in series. When the load device wants to get the maximum ( ), the impedance of that is the same as the output impedance of the source (front-stage) device. A: Current B: Voltage C: Resistance D: Electric power
- 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
内容
- 0
打开窗体时，首先发生的事件是（） A: 加载（Load） B: 打开（Open） C: 激活（Activate） D: 成为当前（Current）
- 1
Ohm's Law is the algebraic relationship between voltage and current for a _______.
- 2
The<br/>common-base amplifier has _()()()__. A: voltage gain, current gain, and power gain B: voltage gain and power gain, but no current gain C: current gain and power gain, but no voltage gain D: current gain and voltage gain, but no power gain
- 3
In a linear regulator, the purpose of using the power transistor is to ( ). A: Increase output voltage B: Increase output current
- 4
打开窗体后，下列事件中首先发生的是 A: 加载（Load) B: 改变（Change) C: 调整大小（Resize) D: 成为当前（Current)