Practice Test (See related pages) 1 The field effect transistor is a four-terminal device. A) True B) False 2 The FET is a unipolar device. A) True B) False 3 Field effect transistors are voltage-controlled devices. A) True B) False 4 In general, bipolar junction transistors are more temperature stable than JFETs. A) True B) False 5 The current flow is between the drain and the source terminals in a JFET. A) True B) False 6 For the p-channel JFET the majority current carriers in the channel are holes. A) True B) False 7 When a JFET is symmetrical, the drain and source leads may not be interchanged without affecting its operation. A) True B) False 8 The border between the ohmic region and the current-source region is called saturation. A) True B) False 9 Whatever method is used to bias a JFET, the gate-source junction is reversed-biased. A) True B) False 10 One of the most common ways to bias a JFET is with . 11 JFETs are used more often than bipolar transistors to amplify small ac signals because JFETs have very input impedance. 12 The unit of gm is . 13 The current gain of a JFET amplifier is . 14 For a common-source amplifier, the output is taken at the . 15 For a common-source amplifier, the input and output voltages are degrees out of phase. 16 For a common-gate JFET amplifier, the input is applied to the . 17 The MOSFET is sometimes referred to as a(n) . 18 In which JFET biasing method does the value of ID for a given value of VGS vary from one JFET to the next making it difficult to predict exact values of ID and VD? A) gate bias B) self-bias C) voltage-divider bias D) current-source bias 19 What is the change in drain current divided by the change in gate-source voltage for a fixed value of VDS? A) conductance B) ac beta C) ac alpha D) transconductance 20 What quantity indicates how effective the gate-source voltage is in controlling the drain current? A) bias B) voltage gain C) power factor D) transconductance 21 Which JFET amplifier is similar to the emitter follower used with bipolar transistors? A) common-source B) common-drain C) common-gate D) gate follower 22 Which JFET amplifier has the disadvantage of very low input impedance? A) common-source B) common-drain C) common-gate D) gate follower 23 Which semiconductor device is normally on? A) depletion-type MOSFET B) enhancement-type MOSFET C) bipolar junction transistor D) zener diode 24 An advantage of a MOSFET over a JFET is it A) is a current-controlled device B) is less expensive C) has a higher input resistance D) has a lower input resistance 25 One disadvantage of MOSFET devices is their extreme sensitivity to A) magnetic fields B) cold C) electrostatic discharge D) heat
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