Deck 3: Eeg and Emg Electrode Placement and Amplification Techniques

Question 1

Letter F in the EEG electrode placement system denotes?

A)front
B)face
C)frontal lobe
D)fast

Answer 1

frontal lobe

Question 2

Normal EEG frequency range is                

A)50-500Hz
B)0.5-50HZ
C)0.05-5Hz
D)1-200Hz

Answer 2

0.5-50HZ

Question 3

The letter T in the EEG electrode placement system denotes?

A)temporal lope
B)temper lobe
C)trace
D)timpanic

Answer 3

temporal lope

Question 4

According to the international 10/20 system to measure EEG, odd number denotes which side of the brain?

A)left
B)right
C)top
D)front

Question 5

The delta wave in EEG ranges from

A)0.5-4Hz
B)4-8Hz
C)8-13Hz
D)13-22Hz

Question 6

Disturbance in the EEG pattern resulting from the external stimuli is called                  

A)provoked response
B)ckoored response
C)evoked response
D)impulse response

Question 7

The peak to peak amplitude of the waves that can be picked from the scalp is

A)100mV
B)100V
C)100uV
D)10mV

Question 8

Which rhythm is the principal component of the EEG that indicates the alertness of the brain?

A)theta rhythm
B)gamma rhythm
C)beta rhythm
D)alpha rhythm

Question 9

Which of the following is a preferred electrode for measuring EMG?

A)surface electrodes
B)needle electrodes
C)pregelled electrodes
D)scalp electrodes

Question 10

Generally what is the material of needle electrodes?

A)stainless steel
B)copper
C)lead
D)iron

Question 11

Monopolar needle electrodes are having coatings of which material over the stainless steel wires which are bare only at the tips?

A)carbon
B)calcium
C)sodium
D)teflon

Question 12

Which electrode can be used to pick up signals from individual fibers of muscle tissues?

A)biopolar needle electrode
B)concentric core needle electrode
C)multi-element needle electrode
D)monopolar needle electrode

Question 13

instrument is used to hold patients head and guide the placement of electrodes.

A)Monotaxic
B)Stereotonic
C)Stereotaxic
D)Monotonic

Question 14

Number of cloud deployment models that are recognized are                    

A)2
B)5
C)3
D)4

Question 15

The ground electrode is usually positioned over which body structures?

A)bony
B)hairy
C)fleshy
D)sweaty

Question 16

When intramuscular EMG is required to look into the electrical activities of deeper or overlaid muscles, electrodes are used.

A)plate shape electrodes
B)surface electrodes
C)thin thread electrodes
D)fine wire electrodes

Question 17

The contraction of the skeletal muscles results in the generation of action potential in the individual muscle fibers. Record of this action potential is called                              

A)ECG
B)EMG
C)EEG
D)EKG

Question 18

In voluntary contraction of the skeletal muscles, the muscle potential ranges from                  

A)50 uV - 5 mV
B)50 mV - 5 V
C)0.05 uV - 2 mV
D)50 mV - 500 mV

Question 19

Bio potential amplifiers have input terminals.

A)3
B)4
C)5
D)6

Question 20

The ability of the amplifier to reject common voltages on its two input leads is known as

A)common mode rejection rate
B)coupled mode rejection rate
C)common mode rejection ratio
D)coupled mode rejection ratio

Question 21

CMRR is measured in                          

A)V/s
B)dB
C)dB/s
D)dB/ms

Question 22

CMRR of the preamplifiers should be as high as possible.

Question 23

The output of differential gain is given by                    

A)(difference of the two input voltage)*(feedback resistance/input resistance)
B)(sum of the two input voltage)*(feedback resistance/input resistance)
C)(difference of the two input voltage)*(input resistance/feedback resistance)
D)(sum of the two input voltage)*(input resistance/feedback resistance)

Question 24

In order to be able to minimize the effects of changes occurring in the electrode impedances, it is necessary to employ a preamplifier having a high input impedance.

A)True
B)False

Question 25

The impedance of the input should be in order to obtain high CMRR in the differential amplifier.

A)low
B)High
C)Does not matter
D)Very low