Electronic Devices 9th Edition

Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) The difference in energy levels that exists between the valence band and the conduction band is called 1) A) energy gap. B) covalent gap. C) semiconductor region. D) spark gap. Answer: A Explanation: A) B) C) D) 2) On diode check, a shorted diode will measure 2) A) 0.7 V. B) 0.3 V. C) 0.79 V. D) 0 V. Answer: D Explanation: A) B) C) D) 3) The boundary between p-type material and

Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) The unity-gain frequency (fT) equals the product of mid-range voltage gain (AV(mid)) and the 1) A) compensating capacitance. B) load resistance. C) fcu. D) BW. Answer: D Explanation: A) B) C) D) 2) Refer to the figure above. If the output voltage at the upper cutoff frequency was 7.19 Vp-p, the output

24) Refer to the figure above. Low frequency response is affected by 24) A) CBE. B) RC. C) C3. D) All of the above. Answer: C Explanation: A) B) C) D) 25) If an amplifier has a voltage gain of 54 dB, and an input signal of 22 mV, the output signal voltage would be 25) A) 55.3 V. B) 24.5 V. C) 11 V. D) 2.45 V. Answer: C Explanation: A) B) C) D) 26) If an amplifier has an input signal voltage of

Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Refer to (c) in the figure above. The symbol is for 1) A) a triac. B) a UJT. C) a diac. D) a PUT. E) an SCR. Answer: D Explanation: A) B) C) D) E) 2) The best choice to shut down a dc power supply in case of an abnormally high voltage condition is a(n) 2) A) SCR. B) diac. C) PUT. D) triac. E) UJT. Answer: A Explanation: A) B) C) D) E) 3) The most likely

Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Refer to the figure above. Which circuit is a voltage follower? 1) A) (a) B) (b) C) (c) D) None of the above. Answer: A Explanation: A) B) C) D) 2) Refer to (b) in the figure above. If this circuit has a Vin = 0.7, Vout would be 2) A) -14.7 V. B) 14 V. C) 0 V. D) 14.7

26) If an op-amp were perfect, the CMRR would 26) A) be zero. B) approach infinity. C) be very small. D) be less than one. Answer: B Explanation: A) B) C) D) 27) The closed-loop voltage gain of an inverting amplifier equals 27) A) the input resistance. B) the ratio of the input resistance to the feedback resistance. C) the feedback resistance divided by the input resistance. D) the open-loop voltage gain. Answer: C Explanation: A) B) C) D) 28) Refer to the figure

Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) The ________ circuit overcomes the problem of false switching caused by noise on the input(s). 1) A) differentiator B) Schmitt trigger C) input buffer D) input noise eliminator Answer: B Explanation: A) B) C) D) 2) A D/A converter is an application of the 2) A) scaling adder. B) voltage-to-current converter. C) adjustable bandwidth circuit. D) noninverting amplifier. Answer: A Explanation: A) B) C) D) 3) Refer to (a) in the

26) Hysteresis voltage is defined as 26) A) the voltage of the lower trigger point. B) the difference in voltage between the upper and the lower trigger points. C) the voltage of the upper trigger point. D) the sum of voltages of the upper and the lower trigger points. Answer: B Explanation: A) B) C) D) 27) A mathematical operation that determines the rate of change of a curve

Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) The output of a peak detector is always 1) A) equal to the min value of the peak level received since the last reset pulse. B) 70.7% of input. C) equal to the max value of the peak level received since the last

23) Refer to (d) in the figure above. If gm= 25 mS and RL= 25 k, the voltage gain would be 23) A) 62.5. B) 6.25. C) 625. D) Not enough information is given. Answer: C Explanation: A) B) C) D) 24) The voltage gain of an OTA can be calculated using the formula 24) A) AV =2Rf Ri. B) AV=Rf Ri. C) AV= gmRL. D) AV = Rf Ri+ 1. Answer: C Explanation: A) B) C) D) 25) The voltage gain

Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Refer to the figure above. Which of these circuits is known as a Hartley oscillator? 1) A) (a) B) (b) C) (c) D) None of the above. Answer: C Explanation: A) B) C) D) 1 2) A Wien-bridge oscillator uses 2) A) positive feedback. B) negative feedback. C) both types of feedback. D) an LC tank circuit. Answer: C Explanation: A) B) C) D) 3) A stable type of oscillator is 3) A) the Clapp

18) Refer to the figure above. To reduce the duty cycle to less than 50%, which of the following circuit changes would be necessary? 18) A) Increase the size of R1. B) Connect a diode in parallel with R2. C) Reduce the size of R1. D) Reduce the size of R2. Answer: B Explanation: A) B) C) D) 19) The higher resonant frequencies of a crystal

Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Switching regulators have ________ than linear regulators. 1) A) simpler circuitry B) more heat-sinking requirements C) greater efficiency D) lower efficiency Answer: C Explanation: A) B) C) D) 2) In a step-up regulator, the output voltage is filtered with a 2) A) choke-input filter. B) voltage divider. C) diode. D) capacitor-input filter. Answer: D Explanation: A) B) C) D) 3) Refer to the figure above. If a wire

25) The LM317 regulator provides a(n) 25) A) adjustable negative output voltage. B) fixed negative output voltage. C) fixed positive output voltage. D) adjustable positive output voltage. Answer: D Explanation: A) B) C) D) 26) A voltage regulator with a no-load output dc voltage of 12 V is connect to a load with a resistance of 10 . If the load resistance decreases to 7.5 , the load voltage

Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) The graphic shown below is a block diagram for an automated test system. Block 2 represents the 1) A) switching control. B) test equipment. C) test controller. D) test fixture. Answer: B Explanation: A) B) C) D) 2) This is a flow chart for a(n) ________ instruction. 2) A) WHILE-DO B) FOR-TO-STEP C) IF-THEN D) REPEAT-UNTIL Answer: D Explanation: A) B) C) D) 1 3) An advantage of pseudocode

Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) The IF amplifiers within an FM radio receiver are tuned to 1) A) 455 kHz. B) 4.55 MHz. C) 100.7 MHz. D) 10.7 MHz. Answer: D Explanation: A) B) C) D) 2) The phase detector in a PLL is followed by a low-pass filter. The low-pass filter passes the ________ and rejects all other

Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Refer to the figure above. The probable trouble, if any, indicated by these voltages is 1) A) an open transformer primary. B) the inductor is open. C) one of the diodes is open. D) an open transformer secondary. E) the filter capacitor is open. Answer: B Explanation: A) B) C) D) E) 2) A reverse-biased silicon diode

31) With a half-wave rectified voltage across a load resistor, load current exists for what part of a cycle? 31) A) 0 degrees B) 90 degrees C) 360 degrees D) 180 degrees Answer: D Explanation: A) B) C) D) 32) A silicon diode has a voltage to ground of 117 V from the anode. The voltage to ground from the cathode is 117.7 V. The diode is 32) A) forward-biased. B) conducting. C) shorted. D) reverse-biased. Answer: D Explanation: A) B) C) D) Figure I Figure

Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) A varactor is a diode that 1) A) varies its resistance with temperature. B) changes its capacitance with voltage. C) emits light when forward-biased. D) switches very fast. E) exhibits an increase in reverse current with light intensity. Answer: B Explanation: A) B) C) D) E) 2) The capacitance of a varactor diode 2) A) decreases as the reverse

28) If the load resistance decreases in a zener regulator, the series current 28) A) stays the same. B) equals the source voltage divided by the series resistance. C) decreases. D) increases. Answer: A Explanation: A) B) C) D) 29) Refer to (a) in the figure above. The symbol is for 29) A) a zener diode. B) an LED. C) a Schottky diode. D) a photodiode. E) a tunnel diode. Answer: B Explanation: A) B) C) D) E) 30) Quantum dot filters are used to 30) A) increase the blue content of an

Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) When transistors are used in digital circuits they usually operate in the 1) A) linear region. B) saturation and cutoff regions. C) active region. D) breakdown region. Answer: B Explanation: A) B) C) D) 2) Normal operation of an NPN BJT requires the base to be ________ with respect to the emitter, and ________ with

25) A transistor collector characteristic curve is a graph showing 25) A) collector current (IC) versus collector-emitter voltage (VCE) for specified values of base current (IB). B) collector current (IC) versus collector-emitter voltage (VCC) for specified values of base current (IB). C) collector current (IC) versus collector-emitter voltage (VC) for specified values of base current (IB). D) emitter

Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) If the collector resistor decreases to zero in a base-biased circuit, the load line will become 1) A) useless. B) flat. C) horizontal. D) vertical. Answer: D Explanation: A) B) C) D) 2) Refer to the figure above. If VC increases to 9 V, which of the following would make the dc collector

18) Refer to (b) in the figure above. The most probable cause of trouble, if any, from these voltage measurements is 18) A) the base-emitter junction is open. B) a short from collector to emitter. C) RE is open. D) There are no problems. Answer: D Explanation: A) B) C) D) 19) Improper biasing can cause distortion in an amplifier's 19) A) power dissipation. B) frequency response. C) input signal. D) output signal. Answer: D Explanation: A) B) C) D) 20) The first step in analyzing

Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) The input resistance of the base of an emitter follower is usually 1) A) high. B) shorted to ground. C) low. D) open. Answer: A Explanation: A) B) C) D) 2) The best choice for a very high power amplifier is a(n) 2) A) common-emitter. B) common-collector. C) emitter-follower. D) common-base. Answer: A Explanation: A) B) C) D) 3) Refer to the figure above. If R2 opened, the

26) Which of the following is not a characteristic of the emitter-follower? 26) A) Low output impedance B) Voltage gain of 1 C) Low input impedance D) High current gain Answer: C Explanation: A) B) C) D) 27) Removing a bypass capacitor from a fully bypassed, common-emitter amplifier circuit will ________ voltage gain and ________ ac input resistance. 27) A) increase, increase B) increase, decrease C) decrease, increase D) decrease, decrease Answer: C Explanation: A) B) C) D) 28) Often a common-collector will be the last

Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Refer to the figure above. The combination of the two transistors is called 1) A) complementary. B) NPN. C) PNP. D) same. Answer: A Explanation: A) B) C) D) 2) A class B amplifier conducts for ________ of the cycle. 2) A) 180 B) 90 C) 360 D) 45 Answer: A Explanation: A) B) C) D) 3) For a class A CE amplifier, the power dissipation, PDQ

26) Refer to the figure above. The purpose for the diodes D1 and D2 is 26) A) to maintain constant bias with temperature changes. B) to allow the correct bias voltages on the two bases. C) to apply equal signals to each transistor. D) All of the above. Answer: D Explanation: A) B) C) D) 27) For a class AB push-pull amplifier, diode bias is used to 27) A) ensure

Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) The easiest way to bias a JFET in the ohmic region is with 1) A) gate bias. B) self-bias. C) voltage-divider bias. D) source bias. Answer: C Explanation: A) B) C) D) 2) The simplest method to bias a D-MOSFET is to 2) A) set VGS = +4. B) set VGS = - 4. C) select

24) Special handling precautions should be taken when working with MOSFETs. Which of the following is not one of these precautions? 24) A) MOSFET devices should have their leads shorted together for shipment and storage. B) All test equipment should be grounded. C) Workers handling MOSFET devices should not have grounding straps attached to their wrists. D) Never remove or insert

Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) How much dc voltage should always be measured at the gate of a common-gate amplifier? 1) A) +VDD B) +VDD 2 C) 0 V D) 0.7 V Answer: C Explanation: A) B) C) D) 2) Where is the input signal applied in a common-gate amplifier? 2) A) Base B) Source C) Drain D) Gate Answer: B Explanation: A) B) C) D) 3) Refer to the figure above. If the

26) Which of the following is not an application of an analog MOSFET switch? 26) A) Analog multiplexer B) Sample-and-hold circuit C) Inverter D) Switched capacitor circuit Answer: C Explanation: A) B) C) D) 27) Refer to the figure above. If Vin = 1 Vp-p, the output voltage Vout would be 27) A) clipped on the negative peaks. B) undistorted. C) clipped on the positive peaks. D) 0 V. Answer: B Explanation: A) B) C) D) 28) Refer to the figure above. If AV1 =