68101. The input differential stage of op-amp. 741 is baised at about 10 μA current such a low current of the input stage gives high CMRRhigh differential gainlow differentialhigh input impedance Which of these are correct?
68102. A Darlington circuit is obtained by connecting
68103. A CE amplifier has a high input signal. In the wave shape of emitter current
68104. An inverting voltage feedback is a
68105. If a transistor is operating with both of its Junctions forward biased, but with the collector base forward biased, but with the collector base forward bias greater than the emitter-base forward bias, then it is operating in the
68106. In a CE amplifier the Q point is very close to cutoff point on the load line. This results in
68107. If the value of C2 and C3 are doubled, the oscillation frequency will be
68108. Which of the following statement about JFET is correct?
68109. Assertion (A): In Darlington pair, the overall β is product of individual βsReason (R): The voltage gain of a base driven amplifier is equal to ac collector voltage divided by ac base voltage
68110. A Wien bridge oscillator uses Wien bridge for
68111. A cascade amplifier will have higher cut off frequency
68112. In figure, current gain is
68113. Which of the following values represents the open loop gain of typical op-amp?
68114. Which of the following configuration has low thermal stability?
68115. Efficiency of class A power amplifier is very poor.
68116. In an op-amp comparator, the positive or negative output is
68117. In logarithmic amplifiers, output voltage is equal to
68118. In a series regulated power supply circuit the voltage gain of pass transistor satisfies the condition
68119. Occasionally a discrete amplifier user RF chokes instead of collector resistors. Such amplifiers are inherently
68120. In oscillator circuits the energy feedback to its input terminal from output is
68121. CC circuit is suitable for impedance matching.
68122. Which of the following number specification refers to FET with one gate?
68123. Which of the following plot can be directly used to determine β?
68124. The emitter follower steps up the impedance by a factor of
68125. In each of circuits below, indicate which diode is conducting?
68126. A dc amplifier can operate
68127. Assertion (A): In a common source amplifier with source terminal at ac ground the voltage gain is about gm rdReason (R): A common source amplifier is a source follower circuit
68128. Thermal runaway will take place if the quiescent point is such that
68129. In applications where __________ input resistance is needed, the JFET is preferred to the bipolar transistor.
68130. A Clapp's oscillator is
68131. In the circuit shown in the figure, the approximate voltage at the transistor,
68132. A quiescent state of a transistor implies
68133. A transistor may fail due to
68134. In a P-N-P transistor, with normal bias, the emitter junction
68135. In a tuned class C power amplifier the quiescent value of collector to emitter voltage is equal to (VCC denotes collector battery voltage)
68136. Volt equivalent temperature in a PN Junction diode is
68137. Primary advantage of a crystal oscillator is that
68138. The conversion or collector circuit efficiency is a measure
68139. A transistor amplifier is operating in class A mode. If a transformer is connected for impedance matching, the efficiency will
68140. The pinch-off voltage is the drain voltage on the shorted gate drain curve above which the drain current becomes
68141. Which of the following plot can be used to show the input volt-ampere characteristics of a common-emitter configuration?
68142. A transconductance amplifier has
68143. 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 output signal-to-noise ratio is
68144. In order to protect a MOSFET against damage from any stray voltage at the gate
68145. A capacitor input filter relies on
68146. RECTIFIER : OSCILLATOR ::
68147. A voltage doubler circuit uses
68148. Which amplifier will be preferred for highest gain?
68149. Which of the following are synonymous?
68150. Which of the following contributes to harmonics distortion in amplifiers?
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