Biomedical Instrumentation Practice Test 8

1. EEG electrodes are smaller in size than ECG electrodes.

True

False

2. ________ CPU has overall system control responsibility.

Acquisition and display

Acquisition

Control and timing

Control

3. Which of the following is the correct definition for Gauge factor?

(resistance of an unstretched wire/incremental change in resistance due to stress)*(unstretched length of wire/incremental change in length)

(incremental change in resistance due to stress/resistance of an unstretched wire)*(incremental change in length/unstretched length of wire)

(incremental change in resistance due to stress/resistance of an unstretched wire)*(unstretched length of wire/incremental change in length)

(incremental change in resistance due to strain/resistance of an unstretched wire)*(unstretched length of wire/incremental change in length)

4. Which of the following amplifier is commonly used for providing protection against leakage currents?

Instrumentational amplifiers

Inverting amplifiers

Isolation amplifiers

Differential amplifiers

5. CMRR of preamplifier upto 5 Khz should be _____________

30 dB

less than 90 dB

10 dB

greater than 90 dB

6. Among the following, which has CMRR is of an order of 100-120 dB?

PCG

ECG

EEG

VCG

7. Reduction in electromagnetic coupling is achieved by _____

multiple grounding

shielding

common grounding

wire twisting

8. Foetal ECG signal detected via electrodes placed on mother’s abdomen is complex and requires attenuation of maternal signals for obtaining FHR.

False

True

9. ________________ is used to describe the figure of merit which determines the overall behaviour of the wire under stress.

gauge factor

elastic modulus

elastic factor

gauge resistance

10. Leucocytes are in the shape of ________

sphere

cuboid

cube

hollow