54401. In figure the input and output Miller capacitances are
54402. An inverting amplifier has R1 = 10 kΩ, and Rf = 150 kΩ then the O/P voltage, if input voltage Vi = 1 volt.
54403. Figure uses 10 V zener diode. The minimum and maximum current through series resistance are
54404. When Z1 << Z, The circuit of figure works as
54405. In a class C operation VCC = 40 V, RL = 50 Ω. The maximum load power can be
54406. IF VCC = 15 V, VCEQ = 5 V and ICQ = 50 mA, the efficiency in class A operation is
54407. A bridge rectifier circuit has a dc load current of 10 mA and a filter capacitance of 1000 μF. The peak to peak ripple voltage is
54408. Which of the following best represents the bandwidth of an actual op-amp?
54409. For an ideal noise free transistor amplifier the noise factor is
54410. In a crystal
54411. Voltage VL in the circuit when Vs < 0 where D is an ideal diode. (Take R1 = Rs = RL = 1 Ω)
54412. Ultra high frequency oscillators work in the range
54413. N-channel FETs are superior to p-channel FETs because
54414. For the amplifier in figure, β = 800. The mid-band voltage gain V0/Vi is
54415. In the circuit of figure, v0 =
54416. Class C amplifier is suitable for
54417. In a N-P-N transistor, when emitter junction is forward biased and collector junction is reverse biased the transistor will operate in
54418. A Wien bridge is suitable for
54419. The signal input to a given amplifier is made up of 100 mΩ signal power and 1 mΩ noise power. The amplifier contributes an additional 100 mΩ of noise and has a power gain of 20 dB. The noise factor is
54420. Assertion (A): The gain of an FET amplifier can be changed by changing gmReason (R): Most receivers use automatic gain control to counteract changes in volume caused by fading
54421. The element in the feedback circuit of a logarithmic amplifier using op-amp is
54422. In a FET, gm varies as
54423. Assertion (A): Class A and Class B amplifier predominate in audio applications.Reason (R): Class C amplifier is used at radio frequencies.
54424. At midband frequencies the coupling capacitor in RC coupled CE amplifier may be considered as
54425. An engineer designs an amplifier to have a voltage gain of 60, but when constructed it only had a gain of 50. What percentage of feedback will cause oscillations?
54426. UP-308 is a hybrid varieties of?
54427. If a class C power amplifier has an input signal with frequency of 200 kHz and the width of collector current pulses of 0.1 ms, then the duty cycle of the amplifier will be
54428. An ideal voltage amplifier should have
54429. The h parameter equivalent circuit of BJT has one voltage source and one current source.
54430. The voltage eo indicated in the figure has been measured by an ideal voltmeter. Which of the following can be calculated?
54431. In an RC-coupled amplifier for improving the low frequency response
54432. The circuit of figure is
54433. The minimum gate source voltage that creates the n-type inversion layer is called
54434. In figure gain bandwidth product is
54435. Consider the following statements
A totem pole configuration used in the output stage if an op-amp has the advantage of using Only n-p-n BJTsComplementary symmetrical pair of transistorsOnly one transistor Which of these statements is/are correct?
54436. Assertion (A): An op-amp amplifier can amplify dc signalReason (R): An op-amp amplifier is a direct coupled amplifier
54437. The most common method for biasing a JFET is
54438. Which of the following figures is an ideal equivalent circuit of a n-p-n transistor?
54439. Which op-amp circuit uses a capacitor in series with input and resistance in feedback path?
54440. For class B operation the theoretical maximum efficiency is
54441. Typical values of current gains for CE, CB and CC amplifiers are
54442. To draw ac equivalent circuit for a CE amplifier we should
54443. In the circuit of figure, the value of re is (neglecting vbe)
54444. In a transistor amplifier, the reverse saturation current ICO
54445. When the emitter current of a transistor is changed by 1 mA, its collector current changes by 0.990 mA. The common-emitter short-circuit current gain is
54446. In figure Vi may vary from 15 to 20 V and load current may vary from 20 mA to 100 mA. Suitable maximum value of R is
54447. Assertion (A): A common collector amplifier is used for matching a high impedance source to a low impedance loadReason (R): A common collector amplifier has a near unity voltage gain
54448. In a crystal oscillator of the Colpitt's oscillator type, the crystal is put is place of the