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Latest SAMEER Project Engineer Exam Question (Objective Questions), MCQ in English

Subjects : Electronics

Question Bank SAMEER Project Engineer Exam (Electronics Engineering) - English
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Electronics

Question 1Single 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 2Single 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 3Single 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 4Single 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 5Single 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
Question 6Single Answer
The number of holes in an N-type silicon with intrinsic value 1.5 × 1010/cm3 and doping concentration of 1017/cm3, by using mass-action law is
  1. A
    6.67 × 106/cc
  2. B
    4.44 × 10-25/cc
  3. C
    1.5× 10-24/cc
  4. D
    2.25 × 103/cc
Question 7Single Answer
A tunnel-diode is best suited for
  1. A
    Very low frequencies
  2. B
    50 Hz
  3. C
    100 Hz
  4. D
    Microwave frequencies
Question 8Single Answer
Small recovery time of a diode is most significant for
  1. A
    Line-frequency rectification
  2. B
    Switching operations
  3. C
    High-frequency rectifications and switching operations
  4. D
    Low-frequency rectifications and switching operations
Question 9Single Answer
In JFET, when operated above the pinch-off voltage, the
  1. A
    Depletion region becomes smaller
  2. B
    Drain current starts decreasing
  3. C
    Drain current remains practically constant
  4. D
    Drain current increases steeply
Question 10Single Answer
Thermal runaway is not possible in FET because, as the temperature of FET increases
  1. A
    The drain current increases
  2. B
    The mobility of charge carriers decreases
  3. C
    The mobility of charge carriers increases
  4. D
    The transconductance increases
Question 11Single Answer
Consider the following statements regarding an N-P-N Bipolar Junction Transistor:
1. Emitter diode is forward biased and collector diode is reverse biased
2. Emitter has many free electrons
3. Free electrons are injected into base and pass through collector
4. Depletion layers around junction J1 and J2 of BJT are widened 
    Which of the above statements are correct?
  1. A
    1, 2 and 4
  2. B
    1, 3 and 4
  3. C
    2, 3 and 4
  4. D
    1, 2 and 3
Question 12Single Answer
A freewheeling diode T phase controlled rectifier
  1. A
    Improves the line power factor
  2. B
    Enables inverse operation
  3. C
    Is responsible for additional reactive power
  4. D
    Is responsible for additional harmonics
Question 13Single Answer
The zeners incorporated within the encapsulations of some MOSFETs are meant for
  1. A
    Reducing the cost
  2. B
    Biasing the gate circuit
  3. C
    Self-protecting the device against transients
  4. D
    None of the above
Question 14Single Answer
When UJT is used for triggering an SCR, the wave-shape of the signal obtained from UJT circuit is
  1. A
    Sine wave
  2. B
    Saw tooth wave
  3. C
    Trapezoidal wave
  4. D
    Square wave
Question 15Single Answer
Darlington pairs are frequently used in linear ICs because, they
  1. A
    Do not require any capacitors or inductors
  2. B
    Have enormous impedance transformation capability
  3. C
    Can be readily formed/hooked from two adjacent transistors
  4. D
    Resemble emitter follower
Question 16Single Answer
In a MOS capacitance fabricate on a P-type semiconductor, strong inversion occurs, when potential is
  1. A
    Equal to Fermi level
  2. B
    Zero
  3. C
    Negative and equal to Fermi potential in magnitude
  4. D
    Positive and equal to Fermi potential in magnitude
Question 17Single Answer
A CMOS amplifier when compared to an N channel MOSFET has the advantage of
  1. A
    Higher cutoff frequency
  2. B
    Higher voltage gain
  3. C
    Higher current gain
  4. D
    Lower power dissipation
Question 18Single Answer
Consider the following statements regardingoptocouplers:
1. Optocouplers are LEDs driving photodiodes in a single package to provide electrical isolation between input and output
2. Optocouplers is LED driving a phototransistor in a single package that replaces pulse transformers working at input zero crossing
3. Optocouplers are used as temporary non fixed joints between optical fibre terminations 
  Which of the above statements are correct?
  1. A
    1, 2 and 3
  2. B
    1 and 2 only
  3. C
    1 and 3 only
  4. D
    2 and 3 only
Question 19Single Answer
Which of the following does not cause permanent damage to an SCR ?
  1. A
    High current
  2. B
    High rate of rise of current
  3. C
    High temperature rise
  4. D
    High rate of rise of voltage
Question 20Single Answer
The basic structure of an avalanche photodiode is
  1. A
    p+ – i – p – n+
  2. B
    p+ – I – n+
  3. C
    p+ – p- – n+
  4. D
    i – p- – n+
Question 21Single Answer
A five digits number is formed using the digits 1, 3, 5, 7 and 9 without repeating any of them. What is the sum of all such possible five digit numbers ?
  1. A
    6666660
  2. B
    6666600
  3. C
    6666666
  4. D
    6666606
Question 22Single Answer
Examples of an active display and a passive display respectively are
  1. A
    LCD and Gas discharge plasma
  2. B
    LED and LCD
  3. C
    Gas discharge plasma and LED
  4. D
    Electrophoretic Image display and LED
Question 23Single Answer
The dc resistivity and permeability exhibited by a type 1 superconductor are respectively
  1. A
    Zero and zero
  2. B
    Zero and unity
  3. C
    Unity and zero
  4. D
    Unity and unity
Question 24Single Answer
Statement (I):One of the mechanisms by which a transistor’s usefulness may be terminated, as the collector voltage is increased, is called punch through.
Statement (II): Punch through results from the increased width of the collector-junction transition region with increased collector-junction voltage
  1. A
    Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I)
  2. B
    Both Statement (I) and Statement (II) are individually true and Statement (II) is NOT the correct explanation of Statement (I)
  3. C
    Statement (I) is true but Statement (II) is false
  4. D
    Statement (I) is false but Statement (II) is true
Question 25Single Answer
Statement (I): Conduction takes place in an enhancement MOSFET only for gate voltages below the threshold level.
Statement (II):In an enhancement MOSFET, a channel of semiconductor of the same type as the source and drain is induced in the substrate by a positive voltage applied to the gate.
  1. A
    Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I)
  2. B
    Both Statement (I) and Statement (II) are individually true and Statement (II) is NOT the correct explanation of Statement (I)
  3. C
    Statement (I) is true but Statement (II) is false
  4. D
    Statement (I) is false but Statement (II) is true
Question 26Single Answer
Statement (I): MOSFET is a field effect transistor whose drain current is controlled by the voltage applied at the gate.
Statement (II): MOSFET is an insulated gate FET
  1. A
    Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I)
  2. B
    Both Statement (I) and Statement (II) are individually true and Statement (II) is NOT the correct explanation of Statement (I)
  3. C
    Statement (I) is true but Statement (II) is false
  4. D
    Statement (I) is false but Statement (II) is true
Question 27Single Answer
Statement (I): All passive components can be fabricated in a single chip.
Statement (II): As opposed to discrete circuits where all components are separately inserted and connected, in an integrated circuit, they are simultaneously created on a chip of semiconductor material during manufacturing
  1. A
    Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I)
  2. B
    Both Statement (I) and Statement (II) are individually true and Statement (II) is NOT the correct explanation of Statement (I)
  3. C
    Statement (I) is true but Statement (II) is false
  4. D
    Statement (I) is false but Statement (II) is true
Question 28Single Answer
What is an advantage of MOS transistor structure in integrated circuits?
  1. A
    Faster switching
  2. B
    Less capacitance
  3. C
    Higher component density and lower cost
  4. D
    Lower resistance
Question 29Single Answer
An LTI system has a wide-sense stationary (WSS) input signal with zero mean. Its output is
  1. A
    Non-zero mean and non-WSS signal
  2. B
    Zero mean and WSS signal
  3. C
    Non-zero mean and WSS signal
  4. D
    Zero mean and non-WSS signal
Question 30Single Answer
In degenerately doped n conduction n-type semiconductor, the Fermi level lies in conduction band when
  1. A
    Concentration of electrons in the conduction band exceeds the density of states in the valence band
  2. B
    Concentration of electrons in the valence band exceeds the density of states in the conduction band
  3. C
    Concentration of electrons in the conduction band exceeds the product of the density of states in the valence band and conduction band
  4. D
    None of the above
Question 31Single Answer
In intrinsic semiconductors, the Fermi level lies?
  1. A
    At mid-gap
  2. B
    Near valence band
  3. C
    Near conduction band
  4. D
    Outside the band gap
Question 32Single Answer
Which material is a direct band-gap semiconductor?
  1. A
    Gallium Arsenide
  2. B
    Germanium
  3. C
    Silicon
  4. D
    Tin
Question 33Single Answer
Indirect band-gap semiconductors require phonon interaction because?
  1. A
    Charge neutrality
  2. B
    Energy conservation
  3. C
    Momentum conservation
  4. D
    Thermal equilibrium
Question 34Single Answer
Band gap of silicon at room temperature is approximately?
  1. A
    0.66 eV
  2. B
    0.72 eV
  3. C
    1.43 eV
  4. D
    1.12 eV
Question 35Single Answer
Increase in temperature causes band gap of semiconductor to?
  1. A
    Increase
  2. B
    Decrease
  3. C
    Remain constant
  4. D
    Become zero
Question 36Single Answer
Electrical conductivity of intrinsic semiconductor depends mainly on?
  1. A
    Doping
  2. B
    Crystal size
  3. C
    Mobility only
  4. D
    Temperature
Question 37Single Answer
In n-type semiconductor, majority carriers are?
  1. A
    Holes
  2. B
    Excitons
  3. C
    Ions
  4. D
    Electrons
Question 38Single Answer
Density of states in conduction band increases with?
  1. A
    Decrease in energy
  2. B
    Cube of energy
  3. C
    Square root of energy
  4. D
    Linear energy
Question 39Single Answer
Fermi level shifts towards conduction band in?
  1. A
    p-type material
  2. B
    Intrinsic material
  3. C
    n-type material
  4. D
    Insulator
Question 40Single Answer
Semiconductor becomes degenerate when?
  1. A
    Lightly doped
  2. B
    Undoped
  3. C
    Heavily doped
  4. D
    Heated
Question 41Single Answer
Built-in potential of PN junction depends on?
  1. A
    Current
  2. B
    Temperature and doping
  3. C
    Area
  4. D
    Frequency
Question 42Single Answer
Depletion region width increases with?
  1. A
    Reverse bias
  2. B
    Forward bias
  3. C
    Zero bias
  4. D
    Temperature rise
Question 43Single Answer
Reverse saturation current is mainly due to?
  1. A
    Majority carriers
  2. B
    Drift only
  3. C
    Recombination
  4. D
    Minority carriers
Question 44Single Answer
Zener breakdown occurs due to?
  1. A
    Avalanche multiplication
  2. B
    Tunneling effect
  3. C
    Thermal runaway
  4. D
    Punch-through
Question 45Single Answer
Zener breakdown is dominant in diodes with?
  1. A
    Wide depletion region
  2. B
    Light doping
  3. C
    Heavy doping
  4. D
    Large junction area
Question 46Single Answer
Gradient of a scalar field gives a?
  1. A
    Vector
  2. B
    Scalar
  3. C
    Tensor
  4. D
    Constant
Question 47Single Answer
Divergence of a vector field physically represents?
  1. A
    Source or sink strength
  2. B
    Flux density
  3. C
    Curling tendency
  4. D
    Energy density
Question 48Single Answer
Curl of a vector field indicates?
  1. A
    Rotational tendency
  2. B
    Rate of change
  3. C
    Flux
  4. D
    Potential
Question 49Single Answer
Divergence of curl of any vector field is always?
  1. A
    Zero
  2. B
    Maximum
  3. C
    Unity
  4. D
    Infinite
Question 50Single Answer
Curl of gradient of any scalar field is always?
  1. A
    Unity
  2. B
    Zero
  3. C
    Infinite
  4. D
    Maximum
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