CBET FC3 2019 CBET FC3 2019.doc, Exams of Nursing

Download CBET FC3 2019 CBET FC3 2019.doc and more Exams Nursing in PDF only on Docsity! CBET FC3 2019 1. The phase relation between current and voltage for pure capacitance is -         current leads voltage by 90 degrees 2. Another name for the "one shot" circuit is -         monostable multivibrator 3. The two's complement of 101101 is -         010011 4. If a step voltage is applied to a capacitor (C) through a series resistor (R), it will charge to 87% of the applied voltage in a time equal to about -         2RC # of time constants % of final value 0 0% 1 63% 2 87% 3 95% 4 98% 5 99% 5. The transistor amplifier configurations that produce output currents which are in phase with their input currents are -         the common base and the emitter follower. (For a common emitter circuit, the output current is out of phase with the input current; Emitter follower circuit = common collector circuit.) 6. The series resistor network shown is an example of a(n) -         voltage divider 7. In the circuit shown, the equation that describes H is -         NOT(AB) + C + D 8. The symbol shown is an -         N-type MOSFET 9. Sequential logic circuits must include -         a timing circuit and memory devices 10. Positive logic is the assignment of logic levels so that -         the most positive level is a binary 1 and the most negative level is a binary 0 11. Load regulation is a measure of a power supply's ability to keep a constant output voltage under conditions of -         changing load current demands 12. A LVDT detector circuit can be used to determine both -         direction and position (linear variable differential transformer (LVDT)) 13. A pressure transducer consists of four identical unbounded strain gauges in a bridge circuit. If the sensitivity of the gauge in one leg is S, the sensitivity of the transducer is -         4S 14. A JFET is a device that can be thought of as a -         voltage controlled current source (junction field-effect transistor (JFET) has a channel connecting the source and drain.) 15. During normal operation of a P-channel JFET, the gate voltage is -         positive with respect to the source 16. A JFET is a device that is normally -         on 17. The percentage resolution of a 9-bit D/A converter is -         0.2% (1 over 2 to the nth power, where n is the number of bits -> 1/512) 18. The resolution of a 7-bit D/A converter is approximately -         0.78% (1 over 2 to the nth power, where n is the number of bits -> 1/128) 19. An advantage of a FET amplifier is that it has -         a low noise output 20. Assuming that V1 and V2 are grounded, then the bias current through R1 is -         457 microamperes 21. Hysteresis losses (磁滞损耗) in a magnetic core -         increase with higher frequencies (The higher the frequency of the current, the more often the magnetic state of the core must change, and the more energy is required to make these changes, so losses increase with higher frequencies.) 22. The gain of the operational amplifier circuit show is -         6 23. In the circuit shown, the emitter voltage of Q2 would be about -         +8 volts 24. A good 1.2 watt light bulb is placed across a 12 volt battery. The resistance of the bulb is -         120 ohms (P = V2 / R) 25. In a series circuit with two or more resistors, replacing one resistor with a higher value resistor will cause the voltage drop across the resistor with the higher resistance to -         increase 1 0 0 1 0 1 1 1 0 0 1 0 -         NAND gate 52. For an amplifier, it is true that -         negative feedback can be used to raise the input impedance of the amplifier 53. The characteristics that make switching power supplies different from linear regulated supplies is that -         the rectifiers are connected directly to the AC line 54. The rolloff characteristic of the filter shown is -         20 decibels per decade 55. Three capacitor, with values of 6.0 microfarads, 3.0 microfarads, and 2.0 microfarads, are connected in series across 100 volts DC. When fully charged, the voltage across the 2.0 microfarad capacitor will be -         50.0 volts (CT = 1 / ( (1/C1) + (1/C2) + (1/C3) ) = 1 microfarad; E1 = (CT X E) / C1 = 50 volts) 56. The Boolean algebra expression A + B + AB is equivalent to -         A + B (A + B + AB = A + B(1) = A + B 57. If the J and K inputs of a TTL JK flip-flop are both high, then -         the Q output will toggle when the flip-flop is clocked J K Q NOT(Q) 0 0 Q NOT(Q) 0 1 0 1 1 0 1 0 1 1 NOT(Q) Q 58. If the J and K inputs of a J-K flip-flop are both low, then the -         Q output will not change when the flip-flop is clocked J K Q NOT(Q) 0 0 Q NOT(Q) 0 1 0 1 1 0 1 0 1 1 NOT(Q) Q 59. In the function block diagram shown, block A is probably a(n) -         mixer 60. Metal Oxide Semiconductor Field Effect Transistors (MOSFETs) are -         voltage controlled devices 61. No depletion region and very fast turn off is a characteristic of a -         Schottky diode 62. MOV (metal-oxide varistor) devices are used to protect electronic equipment from dangerous operating conditions such as -         line transients 63. All of the following are an advantage of negative feedback in an op-amp circuit, -         stability, increased input resistance, and decreased output resistance, except higher gain 64. A major reason for using CMOS integrated circuits as opposed to TTL integrated circuits is that CMOS integrated circuits -         consume less power 65. The phenomenon that occurs when substances emit electrons when illuminated by light is called -         photoelectricity 66. The type of source used in Norton's theorem is a -         current source 67. A two input NAND gate has each input fed by a two input NOR gate. A consistent LOW output would indicate that -         the NOR gates do not have any HIGH inputs 68. To process input signals, microprocessor-based ECG monitors rely on -         analog-to-digital conversion 69. If the resistor value in an ideal series RLC circuit increases, the resonance frequency will -         not be affected 70. The amount of resistance seen by an input signal of an inverting op-amp amplifier is equal to -         inverting input resistor 71. The component most vulnerable to damage from static discharge is a -         CMOS integrated circuit 72. The turns ratio of a transformer that will match an 8,100 ohm output impedance to a 900 ohm load is -         3 to 1 (Turns ratio = square root(Zp / Zs)) 73. In an NPN transistor amplifier, making the base voltage less positive with respect to the emitter -         decrease the collector current 74. A diode's peak-inverse voltage rating refers to the most that the -         cathode can be more positive than the anode potential (The peak-inverse voltage rating tells the maximum voltage that can safely be placed across the diode when it is reverse-biased.) 75. The algebraic sum of all voltages in a closed loop equal zero is an alternative form of -         Kirchoff's voltage law 76. When testing the circuit shown with a logic probe, it was found that the probe blinked at E, F, and G. This shows that -         at least one input gets through to G 77. A forward biased diode made of germanium will have a voltage drop such that the anode will be -         positive with respect to the cathode 78. A NAND gate is an -         active low device 79. If the input is a square wave, then the output of the integrator circuit will be -         a triangular wave 80. The largest number that can be represented by 16-bit binary number is -         65,535 base ten 81. The logic circuit shown has four inputs. If +5 volts = binary 1 and 0 volt = binary 0, the output will be -         binary 0 82. A pull-up resistor is required for -         open collector logic circuits 83. An integrator can be constructed with an op amp using -         a resistor as the input device and a capacitor as the feedback device 84. The equation for the gain of a Darlington configuration using -         two transistors having betas of beta 1 and beta 2 is approximately beta 1 x beta 2 85. An S-R flip-flop is -         bistable (双稳态) S R Q NOT(Q)