BEE Measurement and Instrumentation 4

Question 1

Which type of ADC offers the fastest conversion speed?

Accepted Answer

Flash (parallel) ADC

Answer

A flash ADC uses 2ⁿ−1 comparators simultaneously to determine all bits at once, making it the fastest but most hardware-intensive ADC type.

Question 2

In a digital multimeter (DMM), the term '4½ digit display' means the meter can show:

Accepted Answer

Up to 19999 counts

Answer

A 4½ digit display has four full digits (0–9) and one half-digit that can only display 0 or 1, giving a maximum reading of 19999.

Question 3

The primary purpose of a shunt resistor in an ammeter is to:

Accepted Answer

Bypass excess current around the galvanometer movement

Answer

A low-resistance shunt in parallel with the galvanometer carries most of the current, extending the ammeter's range while keeping the movement current small.

Question 4

Which phenomenon causes the zero-shift error in a strain gauge measurement when temperature changes?

Accepted Answer

Thermal expansion mismatch between the gauge and substrate

Answer

Differential thermal expansion between the metallic gauge element and its bonded substrate generates a spurious apparent strain signal with temperature.

Question 5

In frequency measurement using a CRO, if the time period of one complete cycle is 4 ms, the frequency is:

Accepted Answer

250 Hz

Answer

Frequency = 1/T = 1/0.004 s = 250 Hz.

BEE - Bachelor of Electrical Engineering Practice Test

BEE - Bachelor of Electrical Engineering Practice Test

BEE Measurement and Instrumentation 4