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You Are On Multi Choice Question Bank SET 1031

51551. This is an example of the output swing for a class ________ amplifier.

51552. For BJT power transistors, the collector terminal is always connected to the transistor's case

51553. A class A amplifier has a voltage gain of 30 and a current gain of 25. What is the power gain?

51554. Which of the following transistors has been quite popular as the driver device for class D amplification?

51555. A class A amplifier with RC = 3.3 k and RE = 1.2 k has a VCC = 20 V. Find IC(sat).

51556. Which of the following is (are) the disadvantage(s) of a class B complementary-symmetry circuit?

51557. Which of the power amplifiers has the lowest overall efficiency?

51558. Calculate the efficiency of a class B amplifier for a supply voltage of VCC = 20 V with peak output voltage of VL(p) = 18 V. Assume RL = 16.

51559. You find that this amplifier only shows the negative alternation at the output. The possible trouble might be that

51560. The maximum efficiency of a class B amplifier is ________ percent.

51561. Calculate the effective resistance seen looking into the primary of a 20:1 transformer connected to an 8- load.

51562. The maximum efficiency of a transformer-coupled class A amplifier is ________.

51563. A class ________ amplifier is biased slightly above cutoff and operates in the linear region for slightly more than 180º of the input cycle.

51564. The class ________ amplifier is biased below cutoff.

51565. nMOS and pMOS transistors can be used for class B.

51566. Determine VB1.

51567. A class C amplifier has a tank circuit in the output. The amplifier is conducting only 28°. The output voltage is

51568. What is the maximum efficiency of a class B circuit?

51569. In ________ power amplifiers, the output signal varies for a full 360º of the cycle.

51570. In class B power amplifiers, the output signal varies for ________ of the cycle.

51571. ________ amplifiers have the highest overall efficiency.

51572. Power amplifiers primarily provide sufficient power to an output load, typically from ________ to ________.

51573. The reflected impedance seen from one side of the transformer to the other side is ________.

51574. In a class A transformer-coupled amplifier, the ________ the value of VCEmax and the ________ the value of VCEmin, the ________ the efficiency to (from) the theoretical limit of 50%.

51575. Class D operation can achieve power efficiency of over ________.

51576. In Fourier technique, any periodic distorted waveform can be represented by ________ the fundamental and all harmonic components.

51577. The beta of a power transistor is generally ________.

51578. The fundamental component is typically ________ any harmonic component.

51579. The main feature(s) of a large-signal amplifier is (are) the ________.

51580. The slope of the ac load line in the class A transformer-coupled transistor is ________.

51581. The ________ has the hottest temperature in a power transistor.

51582. The complementary Darlington-connected transistor for a class B amplifier provides ________ output current and ________ output resistance.

51583. The greater the power handled by the power transistor, ________ the case temperature.

51584. A class A amplifier dissipates ________ power when the load is drawing maximum power from the circuit.

51585. The highest efficiency is obtained in class B operation when the level of VL(p) is equal to ________.

51586. ________ transistors can be used to build a class B amplifier.

51587. Improvement in production techniques of power transistors have ________.

51588. The amount of power dissipated by the transistor is the ________ of that drawn from the dc supply (set by the bias point) and the amount delivered to the ac load.

51589. In a class A transformer-coupled power amplifier, ________ winding resistance of the transformer determine(s) the dc load line for the circuit.

51590. A form of class A amplifier having maximum efficiency of ________ uses a transformer to couple the output signal to the load.

51591. A heat sink provides ________ thermal resistance between case and air.

51592. In class B operation, the current drawn from a single power supply has the form of ________ rectified signal.

51593. A ________ power amplifier is limited to use at one fixed frequency.

51594. A class C amplifier is a linear amplifier.

51595. In a class B push-pull amplifier, crossover distortion occurs when both transistors are off and the input signal voltage must exceed VBE before a transistor conducts.

51596. Class AB operation always requires a dual (+/–) supply.

51597. Class A amplifiers operate in the active region of the load line all of the time.

51598. The efficiency of any amplifier is the ratio of signal output power to signal input power.

51599. A class A amplifier conducts 180° of the cycle.

51600. The class C amplifier is biased below cutoff.

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