EE AND ECE IMPORTANT MCQ PDF- ANALOG ELECTRONICS 1 FOR VIZAG MT EXAM 2017

ANS-BOLD OPTION

  1. Which of the following amplifier is considered
    linear?
  • Class A
  • Class B
  • Class C
  • Either
    A or B
  1. The voltage gain of a common collector
    configuration is
  • Unity
  • Zero
  • Very high
  • Moderate
  1. A two-transistor class B power amplifier is
    commonly called
  • Push-pull
    amplifier
  • Dual amplifier
  • Symmetrical amplifier
  • Differential amplifier
  1. If a transistor is operated in such a way that
    output current flows for 160 degrees of the input signal, then it is
    _________ operation.
  • Class A
  • Class C
  • Class B
  • Class AB
  1. Which coupling has the best frequency response?
  • Direct
  • RC
  • Transformer
  • Transistor
  1. A transistor amplifier has high output impedance
    because
  • Emitter is heavily doped
  • Collector is wider than emitter or base
  • Collector
    has reverse bias
  • Emitter has forward bias
  1. Which of the following is considered an amplifier
    figure of merit?
  • Gain-bandwidth
    product
  • Beta (β)
  • Alpha (α)
  • Temperature
  1. What piece of equipment in an oscilloscope is
    used to indicate pulse condition in a digital logic circuit?
  • Probe
  • Test prods
  • Connector
  • Logic
    probe
  1. What linear circuit compares two input signals
    and provides a digital level output depending on the relationship of the
    input signals?
  • Comaparator
  • Controller
  • Compressor
  • Switch
  1. What type of coupling is generally used in power
    amplifiers?
  • Transformer
  • Direct
  • RC
  • Inductive
  1. Which amplifier whose output current flows for
    the entire cycle?
  • Class A
  • Class B
  • Class C
  • Class AB
  1. The coupling capacitor Cc must be large enough to
    ___________ in an RC coupling scheme.
  • Pass dc between the stages
  • Dissipate high power
  • Prevent
    attenuation of low frequency
  • Prevent attenuation of high frequency
  1. What is the point of intersection of dc and ac
    load lines called?
  • Operating
    point
  • Cut off point
  • Saturation point
  • Breakdown
  1. An oscillator produces _________ oscillations.
  • Damped
  • Modulated
  • Undamped
  • Sinusoidal
  1. What is the operating point in the characteristic
    curve called?
  • Quiescent
    point
  • Load point
  • Biasing point
  • Saturation point
  1. Oscillators operate on the principle of
  • Positive
    feedback
  • Negative feedback
  • Signal feedthrough
  • Attenuation
  1. In a class A amplifier, the output signal is
  • Distorted
  • The
    same as the input
  • Clipped
  • Smaller in amplitude than the input
  1. What happens if the input capacitor of a
    transistor amplifier is short-circuited?
  • Biasing
    conditions will change
  • Transistor will be destroyed
  • Signal will not reach the base
  • Biasing will stabilize
  1. Which is used to establish a fixed level of
    current or voltage in a transistor?
  • Biasing
  • Loading
  • Load line
  • Coupling
  1. Which power amplifier has the highest collector
    efficiency?
  • Class A
  • Class C
  • Class B
  • Class AB
  1. What is a non-linear type of amplifier?
  • Class C
  • Class AB
  • Class B
  • Class A
  1. An AF transformer is shielded to
  • Keep the amplifier cool
  • Prevent
    the induction due to stray magnetic fields
  • Protect from rusting
  • Prevent electric shock
  1. Amplitude distortion is otherwise known as
    _________ distortion.
  • Intermodulation
  • Harmonic
  • Phase
  • Resonant
  1. What represents common-emitter small signal input
    resistance?
  • hie
  • hfe
  • hib
  • hoe
  1. The ear is not sensitive to ________ distortion.
  • Frequency
  • Amplitude
  • Harmonic
  • Phase
  1. Class C is an amplifier whose output current
    flows for
  • Less
    than one-half the entire input cycle
  • The entire input cycle
  • Twice the entire input cycle
  • Greater than one-half the entire input cycle
  1. If gain without feedback and feedback factor are
    A and β respectively, then gain with negative feedback is given by
  • A/ 1-A β
  • A/ 1+ A
    β
  • 1+A β / A
  • (1+A β) A
  1. The collector current in an common base
    configuration is equal to
  • Alpha
    times emitter current plus leakage current
  • Alpha times base current plus leakage current
  • Beta times emitter current plus leakage current
  • Beta times collector current plus leakage current
  1. Which is not a basic BJT amplifier configuration?
  • Common-drain
  • Common-base
  • Common-emitter
  • Common-collector
  1. The value of collector load resistance in a
    transistor amplifier is _______ the output impedance of the transistor.
  • Equal to
  • More than
  • Less
    than
  • Not related
  1. What is the purpose of RC or transformer
    coupling?
  • To block ac
  • To
    separate bias of one stage from another
  • To increase thermal stability
  • To block dc
  1. The bandwidth of a single stage amplifier is
    ________ that of multistage amplifier.
  • Equal to
  • Less than
  • More
    than
  • Independent
  1. What is the time taken by the electrons or holes
    to pass from the emitter to the collector?
  • Transit
    time
  • Recombination
  • Transient time
  • Duty cycle
  1. To obtain good gain stability in a negative
    feedback amplifier, AB is
  • Equal to 1
  • Very
    much greater than 1
  • Less than 1
  • Zero
  1. The basic concept of the electric wave filter was
    originated by
  • Campbell
    and Wagner
  • Norton
  • Foster
  • Bode and Darlington
  1. Which configuration has the lowest current gain?
  • Common-base
  • Common-collector
  • Common-emitter
  • Emitter follower
  1. Which transistor configuration offers no phase
    reversal at the output?
  • Common-base
  • Common-collector
  • Common-emitter
  • Both A
    and B
  1. The number of stages that can be directly coupled
    is limited because
  • Change
    in temperature can cause thermal instability
  • Circuit becomes heavily and costly
  • It becomes difficult to bias the circuit
  • Circuits’ resistance becomes too large
  1. The input capacitor in an amplifier is called
    __________ capacitor.
  • Coupling
  • Stray
  • Bypass
  • Electrolytic
  1. AC load line has a/an _________ slope compared to
    that of dc load line.
  • Zero B. Smaller
  • Smaller
  • Bigger
  • Infinite
  1. A multistage amplifier uses at least how many
    transistors?
  • One
  • Three
  • Four
  • Two
  1. RC coupling is used for ________ amplification.
  • Voltage
  • Current
  • Signal
  • Power
  1. An ammeter’s ideal resistance should be
  • Zero
  • Unity
  • Infinite
  • The same with the circuits resistance
  1. What circuit increases the peak –to-peak voltage,
    current or power of a signal?
  • Power supply
  • Attenuator
  • Amplifier
  • Filter
  1. When the non-linear distortion in an amplifier is
    D without feedback, with negative voltage feedback it will be
  • D/ 1+ A
    β
  • 1+ A β / D
  • D (1+A β)
  • D (1-A β)
  1. A tuned amplifier uses what load?
  • Resistive
  • Capacitive
  • LC tank
  • Inductive
  1. The voltage gain over mid- frequency range in an
    RC coupled amplifier
  • Changes instantly with frequency
  • Is
    constant
  • Is independent of the coupling
  • Is maximum
  1. The input impedance of an amplifier _______ when
    negative voltage feedback is applied.
  • Decreases
  • Becomes zero
  • Increases
  • Is unchanged
  1. The input impedance of an amplifier _______ when
    negative current feedback is applied.
  • Remains unchanged
  • Decreases
  • Increases
  • Becomes zero
  1. To obtain the frequency response curve of an
    amplifier ________ is kept constant.
  • Generator
    output level
  • Amplifier output
  • Generator frequency
  • Amplifier frequency
QUIZ OF DAY- 22/05/2017 GK & CURRENT AFFAIRS
Power Systems (Transmissions & Distribution) Expected MCQ PDF 1 For VIZAG MT Exam 2017

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