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Objective Questions

Latest MPPGCL AE Exam Question (Objective Questions), MCQ in English

Subjects : Electronics, General Awareness & Aptitude

Question Bank MPPGCL AE (Electronics) Exam - English
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Electronics

Question 1Single Answer
Which one of the following helps experimental confirmation of the Crystalline state of matter?
  1. A
    Shock compression
  2. B
    Photo emission
  3. C
    Conductivity measurements
  4. D
    X-ray diffraction
Question 2Single Answer
The electrical conductivity of pure semiconductor is:
  1. A
    Proportional to temperature
  2. B
    Increases exponentially with temperature
  3. C
    Decreases exponentially with temperature
  4. D
    Not altered with temperature
Question 3Single Answer
Consider the following statements pertaining to the resistance of a conductor:
1. Resistance can be simply defined as the ratio of voltage across the conductor to the current through the conductor. This is, in fact, Georg Ohm’s law.
2. Resistance is a function of voltage and current.
3. Resistance is a function of conductor geometry and its conductivity
Which of the above statements are correct?
  1. A
    1 and 2 only
  2. B
    2 and 3 only
  3. C
    1 and 3 only
  4. D
    1, 2 and 3
Question 4Single Answer
The ratio of ionic radii of Cations i.e.and that of Anions i.e.for stable and unstable ceramic crystal structure, is:
  1. A
    Less than unity
  2. B
    Greater than unity
  3. C
    Unity
  4. D
    Either lesser or greater than unity
Question 5Single Answer
Which one of the following statements is correct?
  1. A
    For insulators the band-gap is narrow as compared to semiconductors
  2. B
    For insulators the band-gap is relatively wide whereas for semiconductors it is narrow
  3. C
    The band-gap is narrow in width for both the insulators and conductors
  4. D
    The band-gap is equally wide for both conductors and semiconductors
Question 6Single Answer
Which of the following regions of operation are mainly responsible for heating of the transistor under switching operation?
1. Saturation region
2. Cut-off region
3. Transition from saturation to cut-off
4. Transition from cut-off to saturation
Select the correct answer using the codes given below
  1. A
    1, 2 and 4 only
  2. B
    1, 3 and 4 only
  3. C
    2 and 3 only
  4. D
    1 and 3 only
Question 7Single Answer
In a sinusoidal oscillator, sustained oscillations will be produced only if the loop gain (at the oscillation frequency) is
  1. A
    Less than unity but not zero
  2. B
    Zero
  3. C
    Unity
  4. D
    Greater than unity
Question 8Single Answer
The Class-B push-pull amplifier is an efficient two –transistor circuit, in which the two transistors operate in the following way:
  1. A
    Both transistors operate in the active region throughout the negative ac cycle
  2. B
    Both transistors operate in the active region for more than half-cycle but less than a whole cycle
  3. C
    One transistor conducts during the positive half-cycle and the other during the negative half-cycle
  4. D
    Full supply voltage appears across each of the transistors
Question 9Single Answer
PAC stands for______.
  1. A
    Permanent angle converter
  2. B
    Phase angle converter
  3. C
    Phase angle components
  4. D
    Phase angle capacitor
  5. E
    None of these
Question 10Single Answer
For normal operation of a transistor
  1. A
    Forward bias the emitter diode and reverse bias the collector diode
  2. B
    Forward bias the emitter diode as well as the collector diode
  3. C
    Reverse bias the emitter diode as well as the collector diode
  4. D
    Reverse bias the emitter diode and forward bias the collector diode
Question 11Single Answer
Consider the following statements regarding linear power supply:
1. It requires low frequency transformer.
2. It requires high frequency transformer.
3. The transistor works in active region.
Which of the above statements is/are correct?
  1. A
    1 only
  2. B
    2 and 3 only
  3. C
    1 and 3 only
  4. D
    3 only
Question 12Single Answer
A full wave rectifier connected to the output terminals of the mains transformer produces an RMS voltage of 18 V across the secondary. The no-load voltage across the secondary of the transformer is
  1. A
    1.62 V
  2. B
    16.2 V
  3. C
    61.2 V
  4. D
    6.12 V
Question 13Single Answer
MICR stands for______.
  1. A
    Magnetic Ink Chart Receipt
  2. B
    Magnetic Ink Character Recognition
  3. C
    Magnetic Ink Chart Recognition
  4. D
    Magnetic Ink capacitor Reverse
  5. E
    None of these
Question 14Single Answer
In an Op-Amp, if the feedback voltage is reduced by connecting a voltage divider at the output, which of the following will happen?
1. Input impedance increases
2. Output impedance increases
3. Overall gain increases
Which of the above statements is/are correct?
  1. A
    1 only
  2. B
    2 only
  3. C
    3 only
  4. D
    1, 2 and 3
Question 15Single Answer
The transient response rise time (unity gain) of an Op-Amp is 0.05s.The small signal bandwidth is
  1. A
    7 kHz
  2. B
    20 kHz
  3. C
    7 MHz
  4. D
    20 MHz
Question 16Single Answer
A negative feedback of   is applied to an amplifier of open-loop gain 1000. What is the change in overall gain of the feedback amplifier, if the gain of the internal amplifier is reduced by 20%?
  1. A
    295.7
  2. B
    286.7
  3. C
    275.7
  4. D
    266.7
Question 17Single Answer
If the quality factor of a single-stage single tuned amplifier is doubled, the bandwidth will
  1. A
    Remain the same
  2. B
    Become half
  3. C
    Become double
  4. D
    Become four times
Question 18Single Answer
Consider the following statements related to oscillator circuits:
1. The tank circuit of a Hartley oscillator is make up of a tapped capacitor and a common inductor.
2. The tank circuit of a Colpitts oscillator is make up of a tapped capacitor and a common oscillator.
3. The Wien Bridge oscillator is essentially a two-stage amplifier with an RC bridge in the first stage, and, the second stage serving as inverter.
4. Crystal oscillators are fixed frequency oscillators with a high Q-factor.
Which of the above statements are correct?
  1. A
    1, 2 and 3 only
  2. B
    2, 3 and 4 only
  3. C
    1, 2 and 4 only
  4. D
    1, 3 and 4 only
Question 19Single Answer
The most commonly used transistor configuration for use as a switching devices is
  1. A
    Common-base configuration
  2. B
    Common-collector configuration
  3. C
    Common-emitter shorted configuration
  4. D
    Common-emitter configuration
Question 20Single Answer
The simplified form of the Boolean expression AB + A (B + C) + B(B + C) is given by
  1. A
    AB + AC
  2. B
    B + AC
  3. C
    BC + AC
  4. D
    AB + C
Question 21Single Answer
What is the maximum frequency for a sine wave output voltage of 10 V peak with an Op-Amp whose slew rate is 1V/ ?
  1. A
    15.92 kHz
  2. B
    19.73 kHz
  3. C
    23.54 kHz
  4. D
    27.36 kHz
Question 22Single Answer
Which one of the following statements is correct?
  1. A
    TTL logic cannot be used un digital circuits
  2. B
    Digital circuits are linear circuits
  3. C
    AND gate is a logic circuit whose output is equal to its highest input.
  4. D
    In a four-input AND circuits, all inputs must be high for the output to be high.
Question 23Single Answer
The slew rate is the rate of change of output voltage of an operational amplifier when a particular input is applied. What is that input?
  1. A
    Sine wave input
  2. B
    Ramp input
  3. C
    Pulse input
  4. D
     Step input
Question 24Single Answer
Except at high frequencies of switching, nearly all the power dissipated in the switch mode operation of a BJT occurs, when the transistor is in the
  1. A
    Active region
  2. B
    Blocking state
  3. C
    Hard saturation region
  4. D
    Soft saturation region
Question 25Single Answer
Consider the following statements with respect to combinational circuit:
1. The output at any time depends only on the present combination of inputs.
2. It does not employ storage elements.
3. It     performs an operation that can be specified logically by a set of Boolean functions.
Which of the above statements are correct?
  1. A
    1 and 2 only
  2. B
    1 and 3 only
  3. C
    2 and 3 only
  4. D
    1, 2 and 3
Question 26Single Answer
Consider the following statements:
The output of a linear circuit, driven with a sine wave at a frequency f, is itself a sine wave
1. at the same frequency
2. with chance of changed amplitude
3. with chances of changed amplitude and phase
Which of the above statements is/are correct? 
  1. A
    1 and 2
  2. B
    1 only
  3. C
    1 and 3
  4. D
    2 only 
Question 27Single Answer
Consider the following statements:
The main contribution to photo conduction is by
1. the generation of electron and hole pair by a photon
2. a donor electron jumping into the conduction band because of a photon’s energy
3. a valence electron jumping into an acceptor state because of a photon’s energy Which of the above statements is/are correct? 
  1. A
    1 only
  2. B
    2 only
  3. C
    3 only
  4. D
    1, 2 and 3
Question 28Single Answer
Thermal runaway is not possible in FET because as the temperature of the FET increase
  1. A
    mobility decreases
  2. B
     trans-conductance increases
  3. C
    drain current increases
  4. D
    trans-conductance decreases
Question 29Single Answer
For the same network, with 6 V DC connected at port A, 1 Ω connected at port B draws 7/3 A. if 8 V DC is connected to port A, the open circuit voltage at port B is
  1. A
    6 V
  2. B
    7 V
  3. C
    8 V
  4. D
    9 V
Question 30Single Answer
A signal may have frequency components which lie in the range of 0.001 Hz to 10 Hz. Which one of the following types of couplings should be chosen in a multistage amplifier designed to amplify the signal? 
  1. A
    Capacitor coupling
  2. B
    Direct coupling
  3. C
    Transformer coupling
  4. D
    Double-tuned transformer coupling
Question 31Single Answer
If an input impedance of op-amp is finite, then which one of the following statements related to virtual ground is correct ? 
  1. A
    Virtual ground condition may exist.
  2. B
    Virtual ground condition cannot exist
  3. C
    In case of op-amp, virtual ground condition always exists.
  4. D
    Cannot make a valid declaration 
Question 32Single Answer
Hysteresis is desirable in a Schmitt-trigger because 
  1. A
    energy is to be stored/discharged in parasitic capacitances
  2. B
    effects of temperature variations would be compensated
  3. C
    devices in the circuit should be allowed time for saturating and de-saturation
  4. D
    it would prevent noise from causing false triggering 
Question 33Single Answer
In a photoconductive cell the resistance, of the semiconductor material varies with intensity of incident light. 
  1. A
    directly
  2. B
    inversely 
  3. C
    exponentially
  4. D
    logarithmically 
Question 34Single Answer
In graded index multimode optical fiber the refractive index of the core is
  1. A
    uniform across its radial distance except for the cladding
  2. B
    maximum at the fiber axis and decreased stepwise towards the cladding
  3. C
    maximum at the fiber axis and decreases gradually towards the cladding.
  4. D
    maximum at the fiber axis and increases stepwise towards the cladding
Question 35Single Answer
Consider the following factors:
1. Number of turns of the coil
2. Length of the coil
3. Area of cross-section of the coil
4. Permeability of the core
On which of the above factors does inductance, depend?
  1. A
    1, 2 and 3 only
  2. B
    1, 3 and 4 only
  3. C
    1, 2, 3 and 4
  4. D
    2 and 4 only 
Question 36Single Answer
Consider the following statements:
1. Fleming’s rule is used where induced e.m.f. is due to flux cutting.
2. Lenz’s law is used when the induced e.m.f. is due to change in flux linkages.
3. Lenz’s law is direct consequence of the law of conservation of energy.
Which of the above statements are correct? 
  1. A
    1 and 2 only
  2. B
    1 and 3 only
  3. C
    2 and 3 only
  4. D
    1, 2 and 3
Question 37Single Answer
A conductor of length 1 m moves at right angles to a uniform magnetic field of flux density 2Wb/m2 with a velocity of 50 m/s. What is the value of the induced e.m.f. when the conductor moves at an angle of 30° to the direction of the field ?
  1. A
    75 V
  2. B
    50 V
  3. C
    25 V
  4. D
    12.5 V
Question 38Single Answer
The slip of a 400 V, 3-phase, 4-pole, 50 Hz machine running at 1440 r.p.m. is
  1. A
    6%
  2. B
    5%
  3. C
    4%
  4. D
    3%
Question 39Single Answer
A 500 HP, 440 V, 3-phase, 50 Hz induction motor runs at 950 r.p.m. when on full load with a synchronous speed of 1000 r.p.m. for this condition, the frequency of the rotor current will be 
  1. A
    4.0 Hz
  2. B
    3.5 Hz
  3. C
    2.5 Hz
  4. D
    2.0 Hz
Question 40Single Answer
By adding resistance in the rotor circuit of a slip ring induction motor, the starting current
  1. A
    as well as torque reduce
  2. B
    as well as torque increase
  3. C
    reduces but the starting torque increases
  4. D
    increase but the starting torque decreases
Question 41Single Answer
Consider the following statements with regards to an induction motor:
1. Maximum torque is independent of rotor resistance.
2. Starting torque is maximum when rotor resistance equals rotor reactance.
3. Torque is very sensitive to any changes in supply voltage.
Which of the above statements are correct? 
  1. A
    1 and 2 only
  2. B
    1 and 3 only
  3. C
    2 and 3 only
  4. D
    1, 2 and 3
Question 42Single Answer
A transformer has 2% resistance and 5% reactance. What is its voltage regulation at full load with 0.8 p.f. lagging? 
  1. A
    5.3%
  2. B
    4.6%
  3. C
    0.53%
  4. D
    0.43% 
Question 43Single Answer
A voltage is generated across a piezoelectric material, 0.5 cm thick, subjected to an impact of 5 N/m2. The voltage coefficient of the material is 23 kV-m/N. The magnitude of the voltage generated will be
  1. A
    2300 V
  2. B
    1650 V
  3. C
    1150 V
  4. D
    575 V
Question 44Single Answer
The ‘residual resistivity’ of a metal is
  1. A
    due to lattice vibrations at high temperature
  2. B
    due to photon scattering at high temperature
  3. C
    temperature-dependent
  4. D
    temperature-independent
Question 45Single Answer
Electrical conductivity, thermal conductivity and magnetic properties of ceramic material are
  1. A
    very high all the time
  2. B
    very low all the time
  3. C
    dependent on the material
  4. D
    ascertainable, instance to instance
Question 46Single Answer
At temperature of 298 Kelvin, Silicon is not suitable for most-electronic applications, due to small amount of conductivity. This can be altered by
  1. A
    Gettering
  2. B
    Doping
  3. C
    Squeezing
  4. D
    Sintering
Question 47Single Answer
By doping Germanium with Gallium, the types of semi-conductors formed are
1. N type
2. P type
3. Intrinsic
4. Extrinsic
  1. A
    1 and 4
  2. B
    2 and 4
  3. C
    1 and 3
  4. D
    2 and 3
Question 48Single Answer
An n-type of silicon can be formed by adding impurity of:
1. Phosphorous
2. Arsenic
3. Boron
4. Aluminum 
Which of the above are correct ?
  1. A
    1 and 2
  2. B
    2 and 3
  3. C
    3 and 4
  4. D
    1 and 4
Question 49Single Answer
According to Einstein’s relationship for a semiconductor, the ratio of diffusion constant to the mobility of the charge carriers is
  1. A
    Variable and is twice the volt equivalent of the temperature
  2. B
    Constant and is equal to the volt equivalent of the temperature
  3. C
    Equal to two and is twice the volt equivalent of the temperature
  4. D
    Equal to one and is equal to the volt equivalent of the temperature
Question 50Single Answer
Swept-out voltage in PIN diode happens when PIN diode is
  1. A
    Forward biased and the thickness of the depletion layer decreases till I-region becomes free of mobile carriers
  2. B
    Reverse biased and the thickness of the depletion layer increases till I-region becomes free of mobile carriers
  3. C
    Forward biased and the thickness of the depletion layer increases till I-region becomes free of mobile carriers
  4. D
    Reverse biased and the thickness of the depletion layer decreases till I-region becomes free of mobile carriers
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