| 摘要 |
An instructor station for questioning a number of students with questions each of which is answerable by each of the students by a selected one of at least two possible answers provided for each student. The instructor station has a correct reply transmitter for providing the correct reply to each question, a number of signal indicators corresponding to the number of students each corresponding to a specific one of the students, and a reply number selector. Each of a plurality of similar student stations is electrically connected to the instructor station and has an actual reply selector and reply transfer key, signal indicators for evaluating the selected answer and for conveying instructions from the instructor station and a reply number selector for indicating the number of a question answered. And an evaluator is connected between the instructor station and each of the student stations for evaluating the replies selected by the students. The evaluator comprises a plurality of actual reply memories of the same number as the number of student stations connected to the instructor station for recording the correct replies to the questions supplied from the instructor station, a reply number distributor connected to each of the student stations, an actual reply distributor connected to each of the student stations, a timer connected between each of the student stations and each of the distributors for scanning the student stations and controlling the distributors accordingly, a comparator for comparing the replies selected by the students with the correct replies to the questions and providing a comparison result, a decoder and gates coupling the reply number distributor to the actual reply memories and to an input of the comparator, the actual reply distributor being connected to the other input of the comparator, a plurality of student memories connected to the output of the comparator, the student memories comprising a number of groups of memories equal to the number of student stations, each group of memories including a number of memories equal in number to the number of questions, and connectors connecting the student memories to the signal indicators of the instructor station and to the signal indicators of each of the student stations.
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