ID: A Name: Class: Date: Unit 28 Multiple Choice #1-13 1 points ea. Identify the
ID: 2266032 • Letter: I
Question
ID: A Name: Class: Date: Unit 28 Multiple Choice #1-13 1 points ea. Identify the choice that best completes the statement or answers the question. #14-162 points each MUST SHOW MATH for any credit without I. The magnetically operated device that can change values of voltage, current, and impedance changing frequency is the a. converter b. inverter c. transformer d. transistor primary wire compared to the turns of secondary wire is called theratio. In a transformer, the turns of a. isolation b. step-up c. step-down d. turns 2. winding. 3. The transformer winding, which is the power input winding, is called the a. primary b. secondary c. tertiary d. tapped 4. The transformer winding, which is the output winding had the load(s) are connected to is called the winding a. primary b. secondary c. tertiary d. tapped and secondary are physically separated and not connected by a conductor A transformer in which the primary is called a(n)--transformer. a. isolation b. step-up c. step-down d. turns 5. 6. In a transformer, even when there is no load connected, there will be some small current flow known as current. a. excitation b. primary c. secondary d. hysteresisExplanation / Answer
1- c
Transformer is the correct answer.
Transformer is a physical device which transfer power from one coil to another without touching each other. It used principle of electromagnetic induction. It has primary and secondary windings. Power get transferred from primary to secondary. P =VI . So voltage and current also get transferred. But the transferred value depend on winding ratio but the frequency remains same. Hence voltage current as well as impedance can be changed in transformers without changing frequency.
-converter convert AC to DC. Hence incorrect.
-inverter convert DC to AC . Hence incorrect.
-Transistor amplifies the signal and changes frequency. Hence incorrect.