1. The human heart has

(a) 2 valves,

(b) 4 valves,

(c) 5 valves

2. If an IA has a CMRR of 10000, its CMR is

(a) 10,

(b) 50,

(c) 100

3. A 60 Hz notch filter has a lower cutoff frequency of 55 Hz, its upper cutoff frequency is :

(a) 61,

(b) 65.5,

(c) 100

(d) none listed

4. The quality factor of this notch filter is :

(a) 0.175,

(b) 5.175,

(c) 6.0

(d) 10.0

5. If the input to a notch filter is 100 mV, and the attenuation is 95%, the output is

(a) 95 mV,

(b) 0 mV,

(c) 5 mV,

(d) 5 V

6. Which of the following ions is not responsible for biological current

(a) K,

(b) Na,

(c) Ca,

(d) H

7. In the EKG circuit the purpose of the HP filter is

(a) amplification

(b) blocking the DC offset caused by the electrodes

(c) signal attenuation

(d) Mixing

8. The bandwidth of the EKG signal is

(a) 1 KHz,

(b) 1 HZ,

(c) 200 Hz,

(d) 100 Hz.

9. Heart sounds are caused by

(a) stenosis,

(b) valves closing,

(c) turbulent blood flow

(d) heart murmer

10. A R. Leg driven circuit is meant to

(a) minimize common mode noise,

(b) amplify weak EKG signals,

(c) invert the EKG signal

(d) none of the above.

11.The averaging resistors in a R.Leg driven circuit , are called this because,

(a) they are the geometric average of the upper and lower cutoff frequencies of the notch filter,

(b) they average the EKG voltage signal.

(c) they average the RA, and LA voltages.

12. What is the best capacitor to use in a defibrillator

(a) Mica

(b) Mylar,

(c) Electrolytic

(d) tantalum

13. Which of the following waveforms is not used in a defibrillator

(a) damped sinusoid,

 (b) MPTE,

(c) overdamped,

(d) critically damped.

14. If a defibrillator capacitor must hold 200 J of energy and be charged to 4 KV its value is

(a) 25 mF,

(b) 25 F,

(c) 25 microfarad,

(d) 22.5 mF

15. If this capacitor is discharged into a patient load of 100 ohms, How long does it take for the capacitor to be discharged to 50 J.

(a) 2 ms,

(b) 1.73 ms,

(c) 2s

(d) none of the above?