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You Are On Multi Choice Question Bank SET 1291
64551. For a given input frequency, a half-wave rectifier is easier to filter than a full-wave rectifier.
(A): True (B): False
64552. Ripple voltage is caused by the charging and discharging of the filter capacitor.
(A): True (B): False
64553. For greatest reliability, and longest life, diodes should be operated at their maximum ratings.
(A): True (B): False
64554. A diode conducts current when reverse-biased and blocks current when forward-biased.
(A): True (B): False
64555. A single diode in a half-wave rectifier conducts for 180° of the input cycle.
(A): True (B): False
64556. Diode limiters add a dc level to an ac signal.
(A): True (B): False
64557. In a diode clamper, the capacitor retains a charge approximately equal to the peak value of the input.
(A): True (B): False
64558. VRRM is the same as PIV rating.
(A): True (B): False
64559. The output voltage of a center-tapped full-wave rectifier equals the secondary output voltage.
(A): True (B): False
64560. Determine the total discharge time for the capacitor in a clamper having C = 0.01 F and R = 500 k.
(A): 5 ms (B): 25 ms (C): 2.5 ms (D): 50 ms
64561. Which element dictates the maximum level of source voltage?
(A): VZ (B): IZM (C): IZ (D): None of the above
64562. What type of diode circuit is used to clip off portions of signal voltages above or below certain levels?
(A): clipper or limiter (B): clamper (C): IC voltage regulator (D): none of the above
64563. Each diode in a center-tapped full-wave rectifier is ________ -biased and conducts for ________ of the input cycle.
(A): forward, 90º (B): reverse, 180º (C): forward, 180º (D): reverse, 90º
64564. What is the voltage measured from the negative terminal of C4 to the negative terminal of the transformer?
(A): –10 V (B): –20 V (C): 10 V (D): 20 V
64565. A BJT is a ________-controlled device.
(A): current (B): voltage
64566. Referring to this figure, calculate Av if rd = 19 k.
(A): –2.85 (B): –3.26 (C): –2.95 (D): –3.21
64567. A common-drain amplifier is similar in configuration to which BJT amplifier?
(A): common-emitter (B): common-collector (C): common-base (D): common-gate
64568. Referring to this figure, calculate Av for yos = 58 S.
(A): –7.29 (B): –7.50 (C): –8.05 (D): –8.55
64569. Refer to this figure. If Vin = 1 V p-p, the output voltage Vout would be
(A): undistorted. (B): clipped on the negative peaks. (C): clipped on the positive peaks. (D): 0 V p-p.
64570. Use the following equation to calculate gm for a JFET having IDSS = 10 mA, VP = –5 V, and VGSQ = –2.5 V.
(A): 2 mS (B): 3 mS (C): 4 mS (D): 5 mS
64571. For what value of ID is gm equal to 0.5 gm0?
(A): 0 mA (B): 0.25 IDSS (C): 0.5 IDSS (D): IDSS
64572. Refer to this figure. If Vin = 20 mV p-p what is the output voltage?
(A): 176 mV p-p (B): 88 mV p-p (C): 48 mV p-p (D): 24 mV p-p
64573. Referring to the following figure, calculate gm for VGSQ = –1.25 V.
(A): 2 mS (B): 2.5 mS (C): 2.75 mS (D): 3.25 mS
64574. Referring to this figure, calculate the value of RD if the ac gain is 10. Assume VGSQ = ¼Vp.
(A): 2.2 k (B): 2.42 k (C): 2.62 k (D): 2.82 k
64575. Where do you get the level of gm and rd for an FET transistor?
(A): from the dc biasing arrangement (B): from the specification sheet (C): from the characteristics (D): All of the above
64576. The class D amplifier uses what type of transistors?
(A): JFETs (B): BJTs (C): MOSFETs (D): any of the above
64577. What is (are) the function(s) of the coupling capacitors C1 and C2 in an FET circuit?
(A): to create an open circuit for dc analysis (B): to isolate the dc biasing arrangement from the applied signal and load (C): to create a short-circuit equivalent for ac analysis (D): All of the above
64578. An FET is a ________-controlled device.
(A): current (B): voltage
64579. What is the input resistance (Rin(source)) of a common-gate amplifier?
(A): Rs (B): 1 / gm (C): none of the above
64580. There is a ________º phase inversion between gate and source in a source follower.
(A): 0 (B): 90 (C): 180 (D): none of the above
64581. Refer to this figure. If C4 opened, the signal voltage at the drain of Q1 would
(A): increase. (B): decrease. (C): remain the same. (D): distort.
64582. Referring to this figure, find Zo if yos = 20 S.
(A): 1.85 k (B): 1.92 k (C): 2.05 k (D): 2.15 k
64583. Which of the following is a required condition to simplify the equations for Zo and Av for the self-bias configuration?
(A): rd 10RD (B): rd = RD (C): rd 10RD (D): None of the above
64584. The steeper the slope of the ID versus VGS curve, the ________ the level of gm.
(A): less (B): same (C): greater
64585. What is the typical value for the input impedance Zi for JFETs?
(A): 100 k (B): 1 M (C): 10 M (D): 1000 M
64586. MOSFETs make better power switches than BJTs because they have
(A): lower turn-off times. (B): lower on-state resistance. (C): a positive temperature coefficient. (D): all of the above
64587. When VGS = 0.5 Vp gm is ________ the maximum value.
(A): one-fourth (B): one-half (C): three-fourths
64588. MOSFET digital switching is used to produce which digital gates?
(A): inverters (B): NOR gates (C): NAND gates (D): all of the above
64589. Referring to the transfer characteristics shown below, calculate gm at VGSQ = –1 V.
(A): 2 mS (B): 3 mS (C): 4 mS (D): 5 mS
64590. Which type of FETs can operate with a gate-to-source Q-point value of 0 V?
(A): JFET (B): E-MOSFET (C): D-MOSFET
64591. On which of the following parameters does rd have no or little impact in a source-follower configuration?
(A): Zi (B): Zo (C): Av (D): All of the above
64592. Refer to this figure. For midpoint biasing, ID would be
(A): 10 mA. (B): 7.5 mA. (C): 5 mA. (D): 2.5 mA.
64593. Class D amplifiers differ from all other classes of amplifiers because
(A): the output transistors are operated as switches. (B): of their very low input capacitance. (C): of their high-frequency response capabilities. (D): they employ dual MOSFETs.
64594. Refer to this figure. If R7 were to decrease in value, Vout would
(A): increase. (B): decrease. (C): remain the same. (D): distort.
64595. Refer to this figure. If ID = 4 mA, find the value of VGS.
(A): 10.8 V (B): 6 V (C): –0.7 V (D): –6 V
64596. Which FET amplifier(s) has (have) a phase inversion between input and output signals?
(A): common-gate (B): common-drain (C): common-source (D): all of the above
64597. What common factor determines the voltage gain and input resistance of a common-gate amplifier?
(A): RD (B): RL (C): gm
64598. Referring to the figure below, determine the output impedance for VGS = –3 V at VDS = 5 V.
(A): 100 k (B): 80 k (C): 25 k (D): 5 k
64599. Referring to this figure, calculate Zo if rd = 19 k.
(A): 1.75 k (B): 1.81 k (C): 1.92 k (D): 2.00 k
64600. Referring to this figure, calculate Zi if rd = 19 k.
(A): 2.42 M (B): 2.50 M (C): 2.53 M (D): 2.59 M
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