Độ khó: Nhận biết Câu nào sau đây là Đúng khi nói về máy biến thế? Máy biến áp chỉ cho phép biến đổi hiệu điện thế xoay chiều Các cuộn dây máy biến áp đều được cuốn trên lõi sắt Suất điện động trong các cuộn dây của máy biến áp đều là suất điện động cảm ứng Dòng điện chạy trên các cuộn dây sơ cấp và thứ cấp khác nhau về cường độ và tần số Để xem lời giải chi tiết câu hỏi này bạn cần đăng ký khoá học chứa câu hỏi này. Trang chủ Sách ID Khóa học miễn phí Luyện thi ĐGNL và ĐH 2023 Trang chủ Sách ID Khóa học miễn phí Luyện thi ĐGNL và ĐH 2023 Đáp án D Máy biến áp là thiết bị có khả năng biến đổi điện áp xoay chiều, làm tăng hoặc giảm điện áp xoay chiều nên D sai. CÂU HỎI HOT CÙNG CHỦ ĐỀ Khi nói về máy biến áp, phát biểu nào sau đây không đúng? Máy biến áp A. biến đổi tần số dòng điện. B. được dùng phổ biến truyền tải điện. C. biến đổi điện áp. D. có thể làm tăng hoặc giảm điện áp xoay chiều.
Phát biểu nào sau đây đúng khi nói về máy biến áp ?
A. Máy biến áp là máy tăng áp nếu số vòng dây ở cuộn sơ cấp lớn hơn số vòng dây ở cuộn thứ cấp.
B. Máy biến áp biến đổi cả giá trị hiệu dụng và tần số của điện áp xoay chiều.
C. Khi máy biến áp hoạt động, cuộn sơ cấp là cuộn nối với tải tiêu thụ, cuộn thứ cấp là cuộn nối với nguồn.
D. Ứng dụng quan trọng của máy biến áp là làm giảm hao phí trong truyền tải điện năng.
Đáp án và lời giải
Đáp án:D
Chia sẻ
Một số câu hỏi khác có thể bạn quan tâm.
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Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 15 to 19:
Fashions have always changed with time. No(15) ________ Roman girls worried about having the latest hairstyleand boys in Ancient Egypt wanted to have sandals that were cool and not the sensible ones their mothers preferred. Look(16) ________over recent times, there seem to be two main differences in the way fashions have changedcompared to earlier time. Firstly, (17) ________ morepeople have a choice of clothes available to them. Thereare few places in the world where the trainers, the caps or the T-shirts of teenagers do not change from one year to the next. Secondly, styles are (18) ________within a much shorter time than they usedto be. For instance, in the 1960s, (19) ________ had the same low waists and narrow skirts as forty years before. In the early years of the 21st century, the shops are full of long skirts and colored scarves like the ones in fashion only thirty years before. Soon, we will find that the really fashionable people look no different from the rest of us, because it is only ten years since their clothes were in fashion before!
Question 17:
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Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 15 to 19:
Fashions have always changed with time. No(15) ________ Roman girls worried about having the latest hairstyleand boys in Ancient Egypt wanted to have sandals that were cool and not the sensible ones their mothers preferred. Look(16) ________over recent times, there seem to be two main differences in the way fashions have changedcompared to earlier time. Firstly, (17) ________ morepeople have a choice of clothes available to them. Thereare few places in the world where the trainers, the caps or the T-shirts of teenagers do not change from one year to the next. Secondly, styles are (18) ________within a much shorter time than they usedto be. For instance, in the 1960s, (19) ________ had the same low waists and narrow skirts as forty years before. In the early years of the 21st century, the shops are full of long skirts and colored scarves like the ones in fashion only thirty years before. Soon, we will find that the really fashionable people look no different from the rest of us, because it is only ten years since their clothes were in fashion before!
Question 16:
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Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phases that best fits each of the numbered blanks from 34 to 38:
People have always dreamt of living forever. Although we all know this will never happen, we will want to live as long as possible. __(34)__, there are advantages and disadvantages of a long life.In the first place, people who live longer can spend more time with their family and friends. Secondly, __(35)__ have busy working lives look forward to a long, relaxing life, when they can do the things they‘ve never had time for. __(36)__, there are some serious disadvantages. Firstly, many people become ill and consequently have to spend time in hospital or become burden __(37)__ the children and friends. Many of them find this dependence annoying or embarrassing. In addition to this, __(38)__ the fewer friends they seem to have because old friends die or become and it’s often difficult to make new friends. To sum up, living to a very old age is worthwhile for those who stay healthy enough to remain independent and enjoy life.
Question 38:
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Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phases that best fits each of the numbered blanks from 34 to 38:
People have always dreamt of living forever. Although we all know this will never happen, we will want to live as long as possible. __(34)__, there are advantages and disadvantages of a long life.In the first place, people who live longer can spend more time with their family and friends. Secondly, __(35)__ have busy working lives look forward to a long, relaxing life, when they can do the things they‘ve never had time for. __(36)__, there are some serious disadvantages. Firstly, many people become ill and consequently have to spend time in hospital or become burden __(37)__ the children and friends. Many of them find this dependence annoying or embarrassing. In addition to this, __(38)__ the fewer friends they seem to have because old friends die or become and it’s often difficult to make new friends. To sum up, living to a very old age is worthwhile for those who stay healthy enough to remain independent and enjoy life.
Question 37:
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Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phases that best fits each of the numbered blanks from 34 to 38:
People have always dreamt of living forever. Although we all know this will never happen, we will want to live as long as possible. __(34)__, there are advantages and disadvantages of a long life.In the first place, people who live longer can spend more time with their family and friends. Secondly, __(35)__ have busy working lives look forward to a long, relaxing life, when they can do the things they‘ve never had time for. __(36)__, there are some serious disadvantages. Firstly, many people become ill and consequently have to spend time in hospital or become burden __(37)__ the children and friends. Many of them find this dependence annoying or embarrassing. In addition to this, __(38)__ the fewer friends they seem to have because old friends die or become and it’s often difficult to make new friends. To sum up, living to a very old age is worthwhile for those who stay healthy enough to remain independent and enjoy life.
Question 36:
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Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase thet best fits each of the numbered blanks from 31 to 35:
In the western customs (31) _____ hands is the customary form of greeting, but in China a nod of the head or (32) ____ bow is sufficient. Hugging and kissing when greeting are uncommon. Business cards are often (33) _____ and yours should be printed in your own language and in Chinese. Also, it is more respectful to present your card or a gift or-any other article using (34) _____ hands. The Chinese are (35) _____ applauders. You may be greeted with group clapping, even by small children. When a person is applauded is this practice it is the custom for that person to return the applause or a “thank you”.
Question 35:
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Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase thet best fits each of the numbered blanks from 31 to 35:
In the western customs (31) _____ hands is the customary form of greeting, but in China a nod of the head or (32) ____ bow is sufficient. Hugging and kissing when greeting are uncommon. Business cards are often (33) _____ and yours should be printed in your own language and in Chinese. Also, it is more respectful to present your card or a gift or-any other article using (34) _____ hands. The Chinese are (35) _____ applauders. You may be greeted with group clapping, even by small children. When a person is applauded is this practice it is the custom for that person to return the applause or a “thank you”.
Question 33:
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Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase thet best fits each of the numbered blanks from 31 to 35:
In the western customs (31) _____ hands is the customary form of greeting, but in China a nod of the head or (32) ____ bow is sufficient. Hugging and kissing when greeting are uncommon. Business cards are often (33) _____ and yours should be printed in your own language and in Chinese. Also, it is more respectful to present your card or a gift or-any other article using (34) _____ hands. The Chinese are (35) _____ applauders. You may be greeted with group clapping, even by small children. When a person is applauded is this practice it is the custom for that person to return the applause or a “thank you”.
Question 35:
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A GOOD START TO A HOLIDAY
I had never been to Denmark before, and when I set out to catch the ferry in early May, I little (31) _______ that by the end of the trip I'd have made such lasting friendships.
I wanted to use my time well, so I had planned a route which would (32) _______ several small islands and various parts of the countryside. I arrived at Esbjerg, a convenient port for a cyclist’s arrival, where tourist information can be obtained and money changed. A cycle track (33) _______ out of town and down to Ribe, where I spent my first night.
In my experience, a person travelling alone sometimes meets with unexpected hospitality, and this trip was no exception. In Ribe, I got into conversation with a cheerful man who turned (34) _______ to be the local baker. He insisted that I should join his family for lunch, and, while we were eating, he contacted his daughter in Odense. Within minutes, he had (35) _______for me to visit her and her family. Then I was sent on my way with a fresh loaf of bread to keep me going, and the feeling that this would turn out to be a wonderful holiday.
Question 35.
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Read the following passage and mark the letter A, B, C, or D to indicate the correct word or phrase that best fits each of the numbered blanks from 46 to 50:
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Here are tips that help succeed in your job interview: Always arrive early. If you do not know (46) _________ the organization is located, call for exact directions (47) ____________ advance. Leave some extra time for any traffic, parking, or unexpected events. If you are running late, call right away and let someone know. The best time to arrive is approximately 5 - 10 minutes early. Give yourself the time to read your resume one more time, to catch your breath, and to be ready for the interview. Once you are at the office, treat everyone you encounter with respect. Be (48) _________ to everyone as soon as you walk in the door. Wear a professional business suit. This point should be emphasized enough. First (49) ____________ are extremely important in the interview process. Women should (50)_________ wearing too much jewelry or make up. Men should avoid flashy suits or wearing too much perfume. It is also important that you feel comfortable. While a suit is the standard interview attire in a business environment, if you think it is an informal environment, call before and ask. Regardless, you can never be overdressed if you are wearing a tailored suit.
Question 50:
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