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Reduced voltage applied to a motor during the starting perio

题目
单选题
Reduced voltage applied to a motor during the starting period will （）.
A

result in decreased acceleration time only

B

lower the starting current and increase accelerating time

C

cause a greater starting torque

D

increase the starting current and pump capacity

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相似问题和答案

第1题：

The disadvantage of the non－synchronous motor is that it requiresoand it produces a low starting－torque

A.much initial current

B.direct current

C.little initial current

D.constant current


答案：A

第2题：

The main difterence between a motor control circuit containing low voltage protection and low voltage release is that the latter contain

A.a magnetic operating coil

B.normally open line contacts

C.thermal-overload protection

D.a momentary-contact start button


答案：B

第3题：

To make electrochromic windows change color, what is applied to the window glass?

A．Electricity.

B．Tungsten oxide.

C．A battery.

D．A voltage.


正确答案：B
解析：第五段第二句提供了答案。A sheet of glass coated with thin layers of chemical compound such as tungsten oxide中的coated是“涂上一层薄薄的……，”的意思。

第4题：

单选题
Some large A-Cmotors are equipped with heatersThese could be （） (1)resistance heaters bolted directly to the frame (2)low voltage windings embedded in the motor windings
A

(1) only

B

(2) only

C

either (1) or (2)

D

neither (1) or (2)


正确答案： B
解析： 暂无解析

第5题：

单选题
The output voltage of a three-phase alternator is regulated by the （）.
A

AC voltage to the armature

B

AC voltage to the field

C

DC voltage to the armature

D

DC voltage to the field


正确答案： C
解析： 暂无解析

第6题：

Due to the operating characteristics of the system time lag fuses(or dual－element fuses)are necessary for use in()

A.main lighting circuits

B.motor starting circuits

C.emergency lighting circuit

D.general alarm circuits


答案：A

第7题：

What advantages do WPARs have over LPARs？（）

  • A、Security is isolated by the HMC
  • B、Support Live Partition Mobility
  • C、Operating system faults are isolated
  • D、Reduced system management during upgrades

正确答案:D

第8题：

any pointer positionDue to failure of one of the carbon brushes the excitation voltage is lost on one alternator that operating in parallel.Then that alternator will()

A.completely loose its share of the load causing the auxiliary engine to speed up.

B.overload due to reduced voltage output and increased current

C.continue to share the active load(kw)but have high very reactive load

D.try to take all the load and so trip the main circuit breaker


答案：C

第9题：

单选题
Before hydraulic starting of an engine on a covered lifeboat，what need NOT be checked?（）
A

Fuel supply line valve

B

Pressure registered on the accumulator gauge

C

Cold-spark voltage readings test lamp

D

Engine stop control


正确答案： C
解析： 暂无解析

第10题：

单选题
The unloading system on an air compressor will （）.
A

increase compressor discharge pressure on demand

B

increase compressor operating speed as necessary

C

allow the motor to turn the compressor opposed only by friction

D

reduce the compressor frictional load when starting


正确答案： C
解析： 暂无解析

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