Instrument Transformers Quiz

Play an AI-generated podcast conversation about this lesson

What is the purpose of using instrument transformers in ac circuits?

To extend the range of measuring instruments (correct)

To eliminate dynamic errors

To increase operator safety

To decrease the size and cost of instruments

What is the difference between a retardation lag and a time delay in system response?

Retardation lag occurs after a time delay, while time delay occurs immediately.

Retardation lag causes a shift in response along the time axis, while time delay does not.

Retardation lag shifts the response along the time axis, while time delay begins after dead time. (correct)

Retardation lag responds immediately after a change, while time delay has no immediate response.

What contributes to the inability of conventional instruments to directly measure high currents and voltages in power systems?

Lags in system responses

High levels of currents and voltages (correct)

Dynamic errors

Retardation lags

Which type of lag involves a response beginning immediately after a change in the variable?

Retardation lag Signup and view all the answers

How do instrument transformers assist in isolating measuring instruments from high-voltage lines?

By multiplying the voltage and current levels Signup and view all the answers

What is the primary reason for using instrument transformers to measure energy and power in ac circuits?

To extend the range of measuring instruments Signup and view all the answers

What can result from inherent leakage current in multipliers?

Errors in measurement and unnecessary heating Signup and view all the answers

Why are measuring circuits involving shunts or multipliers considered unsafe?

Due to high insulation requirements Signup and view all the answers

What is a benefit of using clamp-on type or split-core type CT's for current measurement?

They do not require breaking the main circuit Signup and view all the answers

Which type of instrument transformer is used to step down high voltages to a moderate level?

Potential transformer (P.T.) Signup and view all the answers

How can single range moderate size instruments cover a wide range of measurement?

When used with a suitable multi-range CT or PT Signup and view all the answers

Why can instrument transformers help in reducing overall cost?

Various instruments can be connected to the same instrument transformer Signup and view all the answers

What is the primary function of a current transformer (CT)?

Step down current ranges of instruments Signup and view all the answers

Why are instrument transformers necessary when measuring the current and voltage of large power equipment like alternators and transformers?

To step down high voltages for safe measurement Signup and view all the answers

Which type of instrument transformer is used for extending the voltage ranges of measuring instruments?

Potential transformer (PT) Signup and view all the answers

Why can't shunts be used for circuits involving large current?

The power loss in the shunt itself will be too high Signup and view all the answers

What role does the primary winding of an instrument transformer play in the connection to power lines?

Links to the power line Signup and view all the answers

How do instrument transformers help in isolating measuring instruments from high-power lines?

By stepping down the high voltage to safe levels for measurement Signup and view all the answers

Instrument Transformers Quiz

Choose a study mode

Podcast

Questions and Answers