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船舶電子技工題庫

電氣系

12級船電班

Thursday, January 09, 2014

【关联题】In synchronous machines, a direct current is applied to the rotor winding, which then produces a rotor magnetic field. The rotor is then turned by a prime mover producing a rotating magnetic field. “Field windings”applies to the windings that produce the main magnetic field in a machine, and “armature windings” applies to the windings where the main voltage is induced. For synchronous machines, the field windings are on the rotor, so the terms “rotor windings” and “field windings” are used interchangeably. The rotor of a synchronous generator is a large electromagnet and the magnetic poles on the rotor can either be salient or non-salient construction. Non-salient pole rotors are normally used for rotors with 2 or 4 poles rotor, while salient pole rotors are used for 4 or more poles rotor.

(1)The prime mover mentioned in the passage does not include .

A. diesel engine

B. wind power

C. Water power

(2) Non-salient pole rotors are normally used for those with poles.

A. not more than 2 pairs

B. not more than 4 pairs

C. more than 2 pairs

(3)Which of the following statements is not TRUE?

A. Field windings produce the main magnetic field

B. A direct current is used to produce magnetic field

C. The main voltage is produced by armature windings

(4)The word “salient” means .

A. prominent

B. pointing outwards

C. not iceable

【单选】The English for “兆欧表”is .

A.Megger

B.V oltmeter

C.M ultimeter

【单选】The is used to measure current.

A.a mmeter

B.v oltmeter

C.w attmeter

【单选】 is a vertical height between the sea level and the bottom of the ship.

A.LOA

B.Beam

C.Breadth

【单选】The of the M/E is 5500kw at 115rpm.

A.o utput

B.t emperature

C.s peed

【单选】The insulation class of an electric motor indicates its .

A.Maximum input of horsepower.

B.Maximum temperature rise of the insulation

material

C.Maximum input of kilowatts

【单选】The English for “电压表”is .

A.V oltmeter

B.S ynchrometer

C.A mmeter

【单选】The SOLAS Convention is the main international convention

.

A.Covering safety of life.

B.About marine

C. About marine pollution prevention

【单选】 is used to measure the voltage.

A.S ynchrometer

B.A mmeter

C.V oltmeter

【单选】The indicator cock is fixed on the cylinder. The meaning of “indicator cock” is .

A.示功阀

B.排气阀

C.安全阀

【单选】Voltage will always lead current in a/an .

A.inductive circuit

B.capacitive circuit

C.magnetic circuit

【单选】Remote control means that .

A.The system is controlled automatically.

B.The system is manned manually

C.The system is situated remotely from the operator