Transformers Quizzes

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A simple design has a core within each coil? Open-ended core

A step up transformer increases AC voltage from primary to secondary winding and it has more windings in the secondary coil than the primary coil

A transformer is a device that either increases or decreases alternating current and voltage using the principle of what? Electromagnetic mutual induction without losing too much energy

Allows selection of different input voltages to step-up or step-down transformer? Autotransformers

Autotransformer? Steps voltage up or down.

Both the primary and secondary coils in a transformer are arranged around this? Central magnetic core

Electromagnetic Induction? The generation of a current by a changing magnetic field

For a step up and step down transformer if the turns ratio is constant what is the only way to change the output voltage? Change the input voltage

For the step down transformer the output voltage on the secondary side is less than

For the voltage related to turn ratio how is the voltage and the number of turns related? They are directly proportional

How are the primary and secondary coils connected in an autotransformer? In a series

How does a transformer work? Current flows thru the primary winding in response to primary voltage and sets up a magnetic field that varies in direction and strength. Under the influence of the changing magnetic field an AC voltage/kv is induced across the secondary coil by electromagnetic induction different from the output voltage and the current on the primary side. Resulting AC in the secondary coil will also induce voltage/kv in the primary coil but in the opposite direction the output voltage in the second coil changes when the primary voltage or turns ratio changes.

How is an autotransformer configured? It has a single coil on a central core

How is the output of the autotransformer connected? What are these connections called? It is connected to the primary coil of the step-up or step-down transformer called output taps

How many coils serve as the primary and secondary windings for an autotransformer? One coils serves as the primary and secondary windings

In a step up transformer the input voltage is less than the output voltage. And the input current on the primary coil is greater than than the input current on the secondary coil

In an autotransformer both voltages are directly proportional to the number of turns? Directly proportional

Mutual Inductance? A measure of the induction between two circuits

Primary Winding? Changing current in it induces a current in a neighboring circuit

Provides the ratio between the applied primary voltage and the induced secondary voltage as result of the turns ratio? Voltage ralated to turns ratio

Refers to the transformer’s ability to avoid power loss (heat)? Transformers efficiency

Secondary Winding? Current is induced by passing a current through the primary coil

Step-Down Transformer? Decreases voltage

Step-Up Transformer? Increases voltage

The current flowing thru the primary winding, in response to the applied primary voltage, sets up what? A magnetic field that varies quickly in direction and strength

The entire transformer is placed in a metal tank then immersed in dielectric oil. What does this do? Dielectric oil; insulates, cools transformer by convection, dissipates heat

The input voltage on the primary side . Output current is greater than the input current

The relationship between amperage flowing through the coils and the number of turns on individual coils is inverse? Current related to turns ratio law

The relationship between current and voltage in the coils are inverse? Current related to voltage law

The simplest type of transformer core? Air core

The voltage induced in the coil is directly proportional to what? The number of turns in the coil

This is an electromagnetic device that operates on the principle of self-induction; it is smaller than standard transformers? Autotransformer

This is the most advanced and most efficient type of tansformer; it is commonly used in x-ray equipment? Shell core

This regulates the low voltage changes in incoming line voltage on the low voltage side of the x-ray circuit before it has been increased by the main step up transformer? Autotransformers

Transformer? Increases or decreases the voltage of AC

Turns Ratio? Secondary windings to primary windings. (Ns/Np)=(Es/Ep)

What 2 types of cores can be used in x-ray equipment? Shell core and closed-ended core

What are the 3 principle components of a transformer? Primary coil; secondary coil; central magnetic core

What are the 3 types of transformers? Step-up (high voltage) transformers; step down transformer; autotransformer

What are the 4 types of transformer cores? ~aire core ~open ended core ~closed ended core (square/doughnut shaped) ~shell core

What does an autotransformer allow the RT to do with the kv? Vary the amount of kv relative to the part

What does the shape of the core of the transformer ensure? A continuous path for the magnetic flux with maximum concentration within the core and minimum leakage of the air

What does the step-down transformer provide to the x-ray tube filament? Low voltage/high current (5-15 volts)

What is an autotransformer used to regulate? Filament voltage (low) and not used for high voltage changes

What is concentrated in the metal core? Magnetic field

What is the central magnetic core made of? Highly permeable material; iron or stalloy

What is the current related to turns ratio law? Ip / Is = Ns / Np

What is the formula for the current related to voltage law? Vs / Vp = Is / Ip

What is the formula for the voltage related to turns ratio? Vs / Vp =  Vp / Ns

What is the output of the autotransformer used to change? The voltage in the primary coils of the step-up and step down transformers

What is the primary coil in a transformer? The input side that attaches to the AC supply it receives the electrical energy or incoming voltage

What is the secondary coil in a transformer?The output side it develops AC by electromagnetic mutual induction. Secondary voltage is induced in this coil

What is used to increase the magnetic flux in a transformer? Central magnetic core

What type of transformer is an autotransformer? What does this mean? Variable transformer  turns ratio can be adjusted

Who selects the different output taps on an autotransformer? And what does this do? The RT; obtains different output voltage which changes the input voltage to the step up or step down transformer and changes the output voltages


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    HIMSS Webinar: PPACA helps nationalize health IT standards

    The Patient Protection and Affordable Care Act (PPACA) may not directly affect health IT professionals as much as legislation like the HITECH Act and HIPAA, but that’s no reason to overlook how the landmark 2010 universal healthcare bill builds upon past efforts to continue health IT’s proliferation.

    The Supreme Court’s recent decision to uphold the majority of the PPACA will be positive for health IT advocates, according to James B. Wieland, JD, principal of Ober, Kaler Grimes & Shriver, a Baltimore-based law firm.

    While many of the PPACA’s health IT-related provisions don’t represent any especially unique ideas, they do a lot to align federal efforts with health IT initiatives occurring in the private sector and at the state level.

    “What’s important about them is the federalization of these ideas,” said Wieland during a July 12 Health Information and Management Systems Society (HIMSS) webinar titled, “The Supreme Court Ruling on the PPACA of 2010: An Analysis of Opinion.”

    The PPACA will lead to more federal regulation and oversight in healthcare settings, but when Wieland says it, he doesn’t mean it in a bad way. He believes federal legislation layered over state laws and private-sector practices will help the healthcare industry achieve nationwide standards for the deployment of health IT.

    For instance, the law requires the Department of Health and Human Services to work with several other federal agencies to develop a risk-based regulatory framework for health IT. A national regulatory framework could encompass the protection of electronic personal health information, simplifying the healthcare ecosystem by eliminating the need for states to deal with the issue individually, as Massachusetts did with state legislation passed this year.

    Some of the PPACA’s more health IT-focused sections include:
    •Section 3013, which demands improvement of existing quality measures and development of new quality measures where none currently exist;
    •Section 10305, which requires the public reporting of performance information that includes data on health IT systems;
    •Section 3022, which creates a shared savings program that eligible accountable care organizations may participate in;
    •Section 10333, which sets aside grant money that can be used for, among many things, telehealth services.

    While the PPACA pushes health IT another step forward, it doesn’t answer all the questions that many patients and providers alike have posed. For instance, the PPACA encourages both patient-centered and evidence-based care. What if a patient doesn’t want an evidence-based treatment, Wieland asked, or what if a patient doesn’t want to take control of his or her care at all?

    Despite some of the dilemmas presented in the 2,800-page bill, Wieland is optimistic. “In my view, we’re getting closer to a standard of care.”

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