民航飞机电气仪表及通信系统试题(英文)

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1. For supplying more electricity, what kind of voltage is used?

A14V AC power

B115V AC power

C14V DC power

D28V DC power

回答错误你的答案正确答案B

2. In a metal airplane, what is used as a return wire?

Aaircraft frame

Bcopper wire

Caluminum wire

Diron wire

回答错误你的答案正确答案A

3. Which is better conductor?

Acopper

Baluminum

Csteel

D(NO)

回答错误你的答案正确答案A

4. Why the wiring is coated [涂上、蒙上]with tin, silver, or nickel?

ATo help prevent oxidation

BTo make the wire har

CTo decrease the resistance of wire

D(NO)

回答错误你的答案正确答案A

5. If a transformer变压器has turns ratio of 12, and inputs of 240 V and 5 amps, the output voltage is ( )

A60V

B120V

C240V

D480V

回答错误你的答案正确答案D

6. If a transformer has turns ratio of 12, and inputs of 240 V and 5 amps, the output current is ( )

A2.5A

B5A

C10A

D20A

回答错误你的答案正确答案A

7. In star connection three-phase AC system, phase voltage is 115V, the line voltage is ( )

A55V

B115V

C200V

D230V

回答错误你的答案正确答案C

8. In star connection连接three-phase AC system, phase current is 100A, the line current is ( )

A50A

B100A

C173A

D200A

回答错误你的答案正确答案B

9. In delta三角形connection three-phase AC system, phase current is 100A, the line current is ( ) A50A

B100A

C173A

D200A

回答错误你的答案正确答案C

10. A transformer rectifier unit (TRU) is used to convert ( )

ADC power to AC

BAC power to DC

CDC power to DC

DAC power to AC

回答错误你的答案正确答案B

11. A frequency-wild generator can be used to operate circuits containing ( )

Aresistive components

Binductive components

Ccapacitive components

D(NO)

回答错误你的答案正确答案A

12. If an over voltage occurs发生, ( ) reset复位may be attempted尝试，试图.

Aone

Btwo

Cthree

Dfour

回答错误你的答案正确答案A

13. On modern aircraft, the Constant Speed Drive Unit (CSDU) and generator are normally combined as one unit, which is known as ( )

ATRU

BIDG

CVSCF

DINV

回答错误你的答案正确答案B

14. The Differential Protection circuit is used to monitor ( )

Aline-to-earth faults

Bunder-voltage faults

Cover-voltage faults

Dunder-frequency faults

回答错误你的答案正确答案A

15. What kind of electrical power is used in relay coil?( )

ADC voltage

BAC voltage

CDC or AC voltage

D(NO)

回答错误你的答案正确答案A

16. In a LA battery, the active material on a charged positive plate is( )

ALead Dioxide (PbO2)

BLead (Pb)

CLead sulphate (PbSO4)

D(NO)

回答错误你的答案正确答案A

17. In a LA battery, the active material on a charged negative plate is ( ) ALead Dioxide (PbO2)

BLead (Pb)

CLead sulphate (PbSO4)

D(NO)

回答错误你的答案正确答案B

18. For a nickel-cadmium battery,the active material on the positive plate is ( ) Anickel hydroxide

Bcadmium hydroxide

CNickel

Dcadmium

回答错误你的答案正确答案A

19. For a nickel-cadmium battery,the active material on the negative plate is ( ) Anickel hydroxide

Bcadmium hydroxide

CNickel

Dcadmium

回答错误你的答案正确答案D

20. In a DC generator, which opponent is used to convert 转换AC to a DC? ( )