Electrical Engg (EEE) - MCQ Practice Questions

In a buck-boost converter, the polarity of output voltage compared to input is:

What is the maximum theoretical efficiency of a step-down chopper with duty cycle 0.5?

Which power semiconductor device is best suited for high-frequency switching applications above 100 kHz?

The holding current (Ih) specification of a thyristor is important to ensure:

What is the purpose of a freewheeling diode in a converter circuit?

What does the snubber circuit in a power converter primarily protect against?

In a full-bridge DC-DC converter, when both upper switches conduct simultaneously, what occurs?

In modern 2024-25 EV charging systems, what is the typical efficiency target for on-board DC-DC converters?

In a three-phase bridge rectifier, if the input AC voltage is 400V (line), what is the approximate average DC output voltage?

Which of the following devices has the highest switching frequency capability among modern power semiconductors?

For an industrial induction motor variable frequency drive (VFD) using vector control, what is the typical output frequency range in 2024-25 applications?

Which of the following is the SI unit of electric current?

The accuracy of an electrical measuring instrument is expressed as a percentage of:

The error in an ammeter connected in series with a circuit is primarily due to:

The class of accuracy for a class 1.5 instrument means:

The input impedance of a digital multimeter is typically:

In a CRO (Cathode Ray Oscilloscope), the Y-deflection sensitivity is expressed in:

The sensitivity of a galvanometer is defined as:

Which of the following is NOT a source of error in analog voltmeters?

A thermocouple generates 50 μV for a temperature difference of 1°C between its junctions. What is its sensitivity?