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一台直流电机，2p=4，S=120，每元件电阻为0.2Ω,当转速n=1000r/min时，每元件的平均电动势为10V.问当电枢绕组为单叠或单波时，电枢端的电压和电枢绕组的电阻Ra各为多少？
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更多“一台直流电机，2p=4，S=120，每元件电阻为0.2Ω,当转速n=1000r/min时，每元件的平均电动势为10V.问当电枢绕组为单叠或单波时，电枢端的电压和电枢绕组的电阻Ra各为多少？”相关的问题
第1题
电动势及电流的变比
=1.2.现要求把起动电流限制为3倍额定电流，试计算应在转子回路每相中接入多大的起动电阻？这时的起动转矩为多少？
第4题
A.245000
B.215000
C.155000
D.165000
第5题
A.16 500，6 000
B.5 000.10 000
C.9 000，5 000
D.16 500.5 000
第7题
第8题
直流电机的电磁转矩与每极磁通成______关系，与电枢电流______关系。
A.正比/反比
B.反比/反比
C.正比/正比
D.反比/正比
第9题
(b) You are an audit manager with specific responsibility for reviewing other information in documents containing
audited financial statements before your firm’s auditor’s report is signed. The financial statements of Hegas, a
privately-owned civil engineering company, show total assets of $120 million, revenue of $261 million, and profit
before tax of $9·2 million for the year ended 31 March 2005. Your review of the Annual Report has revealed
the following:
(i) The statement of changes in equity includes $4·5 million under a separate heading of ‘miscellaneous item’
which is described as ‘other difference not recognized in income’. There is no further reference to this
amount or ‘other difference’ elsewhere in the financial statements. However, the Management Report, which
is required by statute, is not audited. It discloses that ‘changes in shareholders’ equity not recognized in
income includes $4·5 million arising on the revaluation of investment properties’.
The notes to the financial statements state that the company has implemented IAS 40 ‘Investment Property’
for the first time in the year to 31 March 2005 and also that ‘the adoption of this standard did not have a
significant impact on Hegas’s financial position or its results of operations during 2005’.
(ii) The chairman’s statement asserts ‘Hegas has now achieved a position as one of the world’s largest
generators of hydro-electricity, with a dedicated commitment to accountable ethical professionalism’. Audit
working papers show that 14% of revenue was derived from hydro-electricity (2004: 12%). Publicly
available information shows that there are seven international suppliers of hydro-electricity in Africa alone,
which are all at least three times the size of Hegas in terms of both annual turnover and population supplied.
Required:
Identify and comment on the implications of the above matters for the auditor’s report on the financial
statements of Hegas for the year ended 31 March 2005. (10 marks)
第10题
听力原文：女：这种电脑在大商场买不合算，至少要贵10％。
男：那在电脑市场花6000元就能买到了。
问：在大商场买一台电脑要花多少钱？
(21)
A．7000元一台
B．6300元一台
C．6500元一台
D．6600元一台
第11题
A.380 660
B.382 400
C.404 900
D.405 600
