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

Subjects : Concerned Subject (Electronics)

Question Bank SAMEER Project Technical Assistant Exam (Electronics) - English
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Concerned Subject (Electronics)

Question 1Single 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 2Single 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 3Single 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 4Single 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 5Single 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 6Single 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 7Single 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 8Single 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 9Single 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 10Single 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 11Single 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 12Single 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 13Single 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 14Single 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 15Single 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 16Single 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 17Single 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 18Single 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 19Single 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 20Single 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 21Single Answer
Laminated insulation, coated with varnish, is a staple adoption in transformer assemblage in order to
  1. A
    reduce the reluctance of the magnetic path
  2. B
    minimize losses due to eddy currents
  3. C
    increase the reluctance of the magnetic path
  4. D
    increase the defect of eddy current.
Question 22Single Answer
When a ferromagnetic substance is magnetized, there are marginal diminutions in its linear dimensions. This phenomenon is called
  1. A
    hysteresis
  2. B
    magnetostriction
  3. C
    diamagnetism
  4. D
    dipolar relaxation
Question 23Single Answer
When the working temperature becomes more than the Curie temperature, a ferromagnetic material becomes a
  1. A
    diamagnetic material
  2. B
    paramagnetic material
  3. C
    ferromagnetic material
  4. D
    Mu-material 
Question 24Single Answer
Compared to other materials, a material with wider hysteresis loop has 
  1. A
    lower permeability, higher retentively and higher coercivity
  2. B
    higher permeability, lower retentively and higher coercivity
  3. C
    lower permeability, higher retentivity and lower reluctance
  4. D
    lower permeability, lower retentivity and lower residual magnetism 
Question 25Single Answer
Which of the following materials is used in light-emitting diodes ?
  1. A
    Gallium arsenide sulphate
  2. B
    Gallium arsenide phosphide
  3. C
    Gallium chromate phosphide
  4. D
    Gallium phosphide sulphate
Question 26Single Answer
Consider the following methods in nano-particle synthesis:
1. Bottom-up
2. Top-down
3. Side-by-side
Which of these methods is/are slow and does/do not conduce to large-scale production? 
  1. A
    1 only
  2. B
    2 only
  3. C
    3 only
  4. D
    1, 2 and 3
Question 27Single Answer
Consider the following statements:
1. Type-I superconductors undergo abrupt transition to the normal state above a critical magnetic field.
2. Type-II superconductors are highly technologically useful super-conductors because the incidence of a second critical field in them is useful in the preparation of high field electromagnets.
Which of the above statements is/are correct? 
  1. A
    1 only
  2. B
    2 only
  3. C
    Both 1 and 2
  4. D
    Neither 1 nor 2
Question 28Single Answer
Consider the following statements:
1. Metal conductors have more R at higher temperatures.
2. Tungsten can be used as a resistance wire.
3. A superconductive material is one which has practically zero resistance.
Which of the above statements are correct?
  1. A
    1 and 2only
  2. B
    1 and 3 only
  3. C
    2 and 3 only
  4. D
    1, 2 and 3
Question 29Single Answer
Consider the following statements regarding precision in measurements of a quantity:
1. Precision is the measure of the spread of the incident errors.
2. Precision is independent of the realizable correctness of the measurement. 3. Precision is usually described in terms of number of digits used in the measurement by a digital instrument.
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 30Single Answer
Consider the following statements in connection with deflection-type and null-type instruments:
1. Null-type instruments are more accurate than the deflection-type ones.
2. Null-type of instrument can be highly sensitive compared to a deflection-type instrument.
3. Under dynamic conditions, null-type instruments are less preferred to deflection-type instruments.
4. Response is faster in null-type instruments as compared to deflection-type instruments.
Which of the above statements are correct? 
  1. A
    1, 2 and 3
  2. B
    1, 2 and 4
  3. C
    1, 3 and 4
  4. D
    2, 3 and 4
Question 31Single Answer
A voltmeter having a sensitivity of 1000 /V reads 100 V on its 150 V scale when connected across at resistor of unidentified specfications in series with a milliammeter. When the milliammeter reads 5 mA, the error due to the loading effect of the voltmeter will be nearly
  1. A
    13%
  2. B
    18%
  3. C
    23%
  4. D
    33% 
Question 32Single Answer
Consider the following statements:
Sphere gap method of voltage measurement is used
1. for measuring r.m.s. value of a high voltage
2. for measuring peak value of a high voltage 3. as the standard for calibration purposes 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 33Single Answer
High frequency (in the MHz range) and low amplitude (in the mV range) signals are best measured using 
  1. A
    VTVM with a high impedance probe
  2. B
    CRO
  3. C
    moving-iron instrument
  4. D
    digital multimeter
Question 34Single Answer
In scintillation coating applications, shields of which material are generally placed around the photomultiplier tube to overcome interference effects of electrons deflected from their normal path? 
  1. A
    Ferromagnetic
  2. B
    Mu-metal magnetic
  3. C
    Electromagnetic
  4. D
    Dielectric
Question 35Single Answer
Which of the following are measured by using a vector voltmeter?
1. Amplifier gain and phase shift
2. Filler transfer function
3. Complex insertion loss
Select the correct answer using the code given below: 
  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 36Single Answer
The simplest and most common method of reducing any effect of inductive coupling between measurement and power circuits is achieved by using 
  1. A
    a screen around the entire measurement circuit
  2. B
    twisted pairs of cable
  3. C
    capacitor (s) to be connected at the power circuit
  4. D
    capacitor (s) to be connected at the measurement circuit
Question 37Single Answer
Consider the following statements regarding Time-Division Multiplexing (TDM): 1. The information from different measuring points is transmitted serially on the same communication channel.
2. It involves transmission of data samples rather than continuous data transmission.
3. It is especially useful when telemetering fast-changing, high band width data.
Which of the above statements are valid in respect to TDM? 
  1. A
    1, 2 and 3
  2. B
    1 and 3 only
  3. C
    1 and 2 only
  4. D
    2 and 3 only
Question 38Single Answer
Consider the following regarding essential functional operations of a digital data acquisition system:
1. Handling of analog signals
2. Converting the data to digital form and handling it
3. Making the measurement
4. Internal programming and telemetry
 Which of the above are valid in the stated context? 
  1. A
    1, 2, 3 and 4
  2. B
    1, 3 and 4 only
  3. C
    1, 2 and 3 only
  4. D
    2 and 4 only 
Question 39Single Answer
A network in which all the elements are physically separable is called a 
  1. A
    distributed network
  2. B
    lumped network
  3. C
    passive network
  4. D
    reactive network
Question 40Single Answer
Three identical impedances are first connected in delta across a 3-phase balanced supply. If the same impedances are now connected in star across the same supply, then 
  1. A
    the phase current will be one-third
  2. B
    the line current will be one-third
  3. C
    the power consumed will be one-third
  4. D
    the power consumed will be halved
Question 41Single Answer
Consider the following statements regarding trees:
1. A tree contains all the nodes of the graph.
2. A tree shall contain any one of the loops.
3. Every connected graph has at least one tree.
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
Consider the following statements respect to a parallel R-L-C circuit:
1. The bandwidth of the circuit decreases if R is increased.
2. The bandwidth of the circuit remain same if L is increased.
3. At resonance, input impedance is a real quantity.
4. At resonance, the magnitude of the input impedance attains its minimum value.
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 43Single Answer
A unit-step voltage is applied at t = 0 to a series R-L circuit with zero initial condition. Then
  1. A
    it is possible for the current to be oscillatory
  2. B
    The voltage across the resistor at t = 0+ is zero
  3. C
    the voltage across the resistor at t = 0– is zero
  4. D
    The resistor current eventually falls to zero
Question 44Single Answer
One of the basic characteristics of any steady-state sinusoidal response of a linear R-L-C circuit with constant R, L and C values is 
  1. A
    the output remains sinusoidal with its frequency being the same as that of the source
  2. B
    the output remains sinusoidal with its frequency differing from
  3. C
    the output amplitude equals the source amplitude
  4. D
    the phase angle difference between the source and the output is always zero. 
Question 45Single Answer
Which one of the following Analog-to-Digital Converters (ADC) does not use a DAC? 
  1. A
    Digital ramp ADC
  2. B
    Successive approximation ADC
  3. C
    Single-slope ADC
  4. D
    Counting ADC
Question 46Single Answer
A 12-bit A/D converter has a full-scale analog input of 5 V. Its resolution is:
  1. A
    1.22 mV
  2. B
    2.44 mV
  3. C
    3.66 mV
  4. D
    4.88 mV
Question 47Single Answer
How many 3-to-8 line decoders with an enabler input are needed to construct a 6 to 64 line decoder without using any other logic gates? 
  1. A
    11
  2. B
    10
  3. C
    9
  4. D
    8
Question 48Single Answer
The output of a NOR gate is : 
  1. A
    high if all of its inputs are high
  2. B
    low if all of its inputs are low
  3. C
    high if all of its inputs are low
  4. D
    high if only one of its inputs is low
Question 49Single Answer
If the input to a T flip-flop is a 100 MHz signal, the final output of three T flip-flops in a cascade is : 
  1. A
    1000 MHz
  2. B
    520 MHz
  3. C
    333 MHz
  4. D
    12.5 MHz
Question 50Single Answer
The addition of the two numbers (1A8)16+ (67B)16 will be :
  1. A
    (889)16
  2. B
    (832)16
  3. C
    (823)16
  4. D
    (723)16
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