).
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
举一反三
- 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
- 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 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
- 100%<br/>Protection for generator stator single phase earth fault() A: zero<br/>sequence voltage protection B: third<br/>harmonic voltage protection C: zreo<br/>sequence current
- The inductor voltage phase lags its current by 90 o, and the capacitor current lags its voltage by 90 o, is this conclusion true? [ ]. A: It's impossible. B: When the capacitance and inductance are nonlinear components. C: When inductance current and voltage, capacitance current and voltage are not related direction. D: Whenever.
内容
- 0
The isolating switch model is GN2-10/1000, meaning ( ). A: Rated voltage 2KV, rated current 10A B: Rated voltage 2KV, rated current 1000A C: Rated voltage 10KV, rated current 1KA D: Rated voltage 10KV, rated current 10KA
- 1
A transistor is a ( )operated device. A: voltage B: current C: both voltage and current D: none of the above
- 2
The effective value of ac voltage or current is（ ） A: The average value of a voltage or current B: DC equal to the AC thermal effect is defined as the effective value of AC C: voltage or current are 0.707 of their amplitudes D: closely related to the frequency of alternating current
- 3
It can be measured by HF9600E Multi-Function Power Meter（ ） A: Current RMS B: voltage RMS C: instantaneous power D: active power
- 4
The no-load character of a 3-phase synchronous generator is the relationship between ( ). A: no-load emf Eo; exciting current If B: output<br/>voltage U; load current I C: output current I; exciting current If D: no-load<br/>emf Eo; load current I