Select all statements below that are TRUE.
a.Transformers can increase both voltage and current at the output.
b.Transformers can be used as an impedance matching element.
c.Transformers work by coupling magnetic fields between coils.
d. LVDTs measure linear displacement.
e.Transformers allow DC current to pass through.
e. I have no idea what pass thru means.
a. is ridiculous, only energy machines can do that.
a. ridiculous as Bob said
b. I suppose but unlikely use
c. Yes
d, Yes
e. also silly, work by change of field with time
b. Transformers can be used as an impedance matching element.
c. Transformers work by coupling magnetic fields between coils.
To determine which statements are true, we need to evaluate each one individually.
a. Transformers can increase both voltage and current at the output.
False. Transformers are not capable of increasing power, so when the voltage is increased, the current is reduced proportionally, and when the current is increased, the voltage is reduced proportionally. This relationship is determined by the transformer's turns ratio.
b. Transformers can be used as an impedance matching element.
True. Transformers can match the impedance of a source with the impedance of a load. By adjusting the turns ratio, the input and output impedance can be effectively matched.
c. Transformers work by coupling magnetic fields between coils.
True. Transformers operate on the principle of electromagnetic induction. When current flows through one coil, it creates a magnetic field which induces a voltage in the other coil(s) coupled with it.
d. LVDTs measure linear displacement.
True. LVDT stands for Linear Variable Differential Transformer. It is a type of sensor commonly used to measure linear displacement. It works based on the mutual induction principle using primary, secondary, and differential coils.
e. Transformers allow DC current to pass through.
False. Transformers only work efficiently with alternating current (AC) due to the changing magnetic field required for electromagnetic induction. They are not designed to pass direct current (DC) as there is no variation in the magnetic field in DC. However, transformers can still pass a small amount of DC with some losses.