Like all things in the universe, there are certain constants that have been defined by scientists to define various concepts and phenomena. Impedance is one of these constants, and it has been defined as the resistive opposition to the flow of alternating current in an AC circuit. This means that impedance—or Z—is essentially a measure of how difficult it is to transfer electrical energy across an AC circuit.

The term impedance is derived from a Latin word meaning resistance. In electrical engineering, it is a measure of opposition to current flow. There are two types of impedance — referred to as internal impedance and source impedance. The total impedance of a circuit is equal to the summation of its individual impedances. This means that if you have multiple resistors in series or parallel in a circuit, their combined values will determine overall impedance. For example, if you have three resistors with values of 1 ohm each in series, then their combined value will be 3 ohms. If those same three resistors were placed in parallel, they would add up to 1 ohm again.

#### What Are The Most Common Types of Impedance?

In electrical engineering, impedance is a measure of resistance to current flow. It has units of ohms, which is a measure of voltage over current. Impedance also determines how much voltage or power will be lost across a circuit, as well as how much energy is absorbed by a circuit when it’s carrying currents and voltages in certain directions.

Following are some of the multiple choice questions on the **Impedance** with answers that will help the students in developing their knowledge.

## Impedance MCQ

### 1. What unit is a capacitor measured in?

### 2. 5∠150° 10∠−60°Determine in rectangular form

### 3. 2∠45°×3∠135° Determine in polar forms

### 4. 2+j10 7−jDetermine the answer in rectangular forms

### 5. Convert to polar:−4+j4

### 6. Identify the voice track

### 7. NK cells lack cell makers except

### 8. Helper T-cells are activated by

### 9. Contents of Drabkin‘s reagent is?

### 10. Expansion of VCS ? a)Volume conductivity scatteringc)Volume conduction stabilityb)Volume current stabilityd)Volume concentration sediment

### 11. Using the principle of electrical impedance, cells are counted by?

### 12. Corrected WBC count is calculation from?

### 13. Which among the following is NOT a content of Hayem's fluid

### 14. One cubic millimeter is equal to ....

### 15. The needle is used for microtrephine biopsy?

### 16. Anticoagulant used to flush indwelling lines before blood collection ?

### 17. What is the formula for inductive reactance?

### 18. What is the formula for capacitive reactance?

### 19. is the formula for .....

### 20. _________ makes the current lead the voltage

### 21. What is Ehrlich phenomenon?

### 22. Molecular Koch's postulate was formulated by

### 23. Who invented homogenizer

### 25. The marker enzyme of cytoplasm is

### 26. Semiautonomous organelle in cell is:

### 27. Cell theory was proposed by

### 28. Work on ….….......by Pasteur led to the germ theory of disease?

### 29. Father of chemotherapy is

### 30. Name the Bacteria which do not satisfy Koch's postulate?

### 31. The scientist who isolated Adenine and thymine

### 32. Mrs. Moore made a circuit. It did not light up. Why?

### 33. What unit is an inductor measured in?

### 34. What unit is impedance measured in?

### 36. In 7 + j6 which part refers to imaginary

### 37. Convert to rectangular form:

### 38. Determine in rectangular forms: (3 + j5) + (4 − j3)

### 39. Convert:12−j42 to polar form

### 40. Convert to rectangular form:

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