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3 stages of system lifecycle of computers?
-Fact finding. -A feasibility study. -An analysis phase. -System design. -Implementation. -Testing. -Documentation. -Evaluation.
In a modern industrial plant the most likely polyphase power system in use is a A. one-phase system. C. three-phase system. B. two-phase system. D. four-phase system.?
A "three-phase system" is a polyphase system having three phases. The term "polyphase system" just means a system having multiple phases. If it is used by itself, "a polyphase system" doesn't mean "a three-phase system".
How does a two-phase system differ from a three phase system?
A two-phase system is archaic and you are unlikely to find it in use anywhere these days, so it is mainly of historical interest. A two-phase, three-wire system, consists of two phase voltages, displaced from each other by 90 electrical degrees, and a phase voltage which is 1.414 x phase voltage.A three-phase system consists of three phase voltages which are displaced from each other by 120 electrical degrees. In the case of a three-phase, three-wire, system, the line voltages are numerically equal to the phase voltages; in the case of a three-phase, four-wire, system, the line voltages are 1.732 x phase voltage.
What is Electricity use difference between 3 phase and 1 phase?
A two-phase a.c. system is an archaic system, in which two phase voltages are generated 90 electrical degrees apart. It has nothing whatsoever to do with the US 'split phase' system that supplies North American homes. A two-phase system can be a four-wire system, or a three-wire system, and was useful because, unlike a single-phase system, it could create naturally rotating magnetic fields in induction motors. It has long been superseded by the three-phase system.
What is the voltage level of two phase machine in three phase?
From one phase to the next you should see 208 Volts.From any phase to ground you should see 121 Volts.AnswerYou are very unlikely to come across a two-phase machine, as two-phase a.c. systems are archaic. A two-phase system has two phase voltages that are 90 degrees out of phase with each other, and was used many years' ago. These days, you have either single phase or three phase. So it's probably safe to say that there are no two-phase motors about, these days!
Relationship of effective testing with other phases of software development?
Testing needs to be done on any IT solution or system which is built.1. Developers should perform unit testing on the code they have developed.2. System testing should be performed when all of the units of code have been implemented3. User acceptance testing should be done when the solution is integrated to ensure it is usable.Commonly, Business Analysts define Use Cases in the requirements definition phase of a project, these Use Cases are used during testing to ensure the system behaves as per the requirements.
What is the final testing phase when developing an accounting information system?
Acceptance testing ensures that the modifications meet user expectations and that the entire AIS performs as designed.
What is a phase IIa clinical trial?
A phase II clinical trial is the phase of testing to see whether or not a drug has any biological effect. The phase IIa trial is the phase in which it is determined what dosage of a drug should be given.
What is the difference between integration testing and system testing In terms of system testing when the test cases for blackbox testing can be designed and when the test cases for whitebox testing?
Integration testing - Its like increment Testing, where we test individual components and their effect on other components as and when they are added. System Testing - System is tested as a whole. You may say that it is integration testing when last component is added. White box test cases are mainly designed and executed by developers or a separate white box test team. This can happen in detail design/coding phase generally during. Blackbox test cases are written once requirements are freezed by test team in parallel to design phase as per V model.
3 stages of system lifecycle of computers?
-Fact finding. -A feasibility study. -An analysis phase. -System design. -Implementation. -Testing. -Documentation. -Evaluation.
Does the program development cycle begin at the start of the planning phase in the system development cycle?
False.
What are three phases of laboratory testing?
The three phases of laboratory testing are pre-analytical phase, analytical phase, and post-analytical phase. The pre-analytical phase refers to all the steps taken prior to the actual testing of a specimen (e.g. specimen collection, transport, accessioning). The analytica phase includes the actual testing analysis. The post-analystical phase includes test reporting and interpretation.
How should testing fit within the project lifecycle?
Testing, in traditional Project Management, is always in the last phase. This is not usually the same in other methodologies (agile, etc...)
What is the differecne between penetration testing and vulnerability testing?
Vulnerability testing identifies available vulnerabilities and is usually used to only manage list of available vulnerabilities. Penetration testing includes phase of Vulnerability testing but goes beyond. The tester actively tries to exploit identified vulnerabilities to gain access to the system. Penetration testing identifies the true risk level of tested system and application.
Which phase consumes the maximum effort in waterfall model for developing a software product and why?
The testing phase consumes the maximum effort in waterfall model.
What is phase 1 testing?
In terms of drug testing, phase 1 is the first human testing. Usually on a small group of less than a hundred people, consisting of healthy young adult males.
A testing process that exercises a software system's coexistence with others by taking multiple integrated systems that have passed system testing as input and tests their required interactions?
Integration Testing, abbreviated I&T. Is the phase of software testing in which individual software modules or individual applications, client and server applications on a network, combined and tested as a group. Integration testing is done after Unit testing is completed and before system testing starts. Integration testing takes modules that have been unit tested as its input, groups them in larger aggregates, applies tests defined in an integration test plan to those aggregates, and delivers as its output the integrated system ready for system testing. Different types of integration testing are big bang, top-down, and bottom-up.
