All India Electrical Engineering (EE) Group

Turns ration for a C.T. is _________
  • a)
    n = Np ⁄ Ns
  • b)
    n = Ns ⁄ Np
  • c)
    n = 1 ⁄ Np
  • d)
    n = Ns
Correct answer is option 'B'. Can you explain this answer?

Surbhi Chopra answered  •  1 hour ago
Turns ratio for a C.T.
In a current transformer (C.T.), the turns ratio is defined as the ratio of the number of secondary turns (Ns) to the number of primary turns (Np). The turns ratio determines the transformation of current from the primary side to the secondary side.

Options Explained:

a) n = Np / Ns
This option is not correct as the turns
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Consider the following statements:
Nichol’s chart gives information about.
i. Closed loop frequency response.
ii. The value of the peak magnitude of the closed loop frequency response Mp.
iii. The frequency at which Mp occurs.
Which of the above statements are correct?
  • a)
    2 and 3
  • b)
    1 and 2
  • c)
    1 and 3
  • d)
    1,2 and 3
Correct answer is option 'D'. Can you explain this answer?

Surbhi Chopra answered  •  1 hour ago
Explanation:

Statements:
- i. Closed loop frequency response: Nichol’s chart provides information about the closed loop frequency response of a system. It is a plot that shows the magnitude and phase of the system's transfer function as a function of frequency.
- ii. The value of the peak magnitude of the closed loop frequency response Mp: Nichol’s
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An amplifier operating from ±3V provide a 2.2V peak sine wave across a 100 ohm load when provided with a 0.2V peak sine wave as an input from which 1.0mA current is drawn. The average current in each supply is measured to be 20mA. What is the amplifier efficiency?
  • a)
    20.2%
  • b)
    25.2%
  • c)
    30.2%
  • d)
    35.2%
Correct answer is option 'A'. Can you explain this answer?

Charvi Reddy answered  •  10 hours ago
Efficiency Calculation:

Given Data:
- Peak output voltage (Vp_out) = 2.2V
- Load resistance (R_load) = 100 ohm
- Peak input voltage (Vp_in) = 0.2V
- Input current (I_in) = 1.0mA
- Average supply current (I_supply) = 20mA

Calculations:
1. Calculate the RMS value of the output voltage:
- Vrms_out = Vp_out / sqrt(2)
-
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Which of the following wave is known as “amplitude modulated wave” of x(t)?
  • a)
    C.x(t) (where C is a constant)
  • b)
    x(t)+y(t)
  • c)
    x(t).y(t)
  • d)
    dx(t)/dt
Correct answer is option 'C'. Can you explain this answer?

Pallavi Nair answered  •  17 hours ago
Amplitude Modulated Wave of x(t)
Amplitude modulation is a method of varying the amplitude of a carrier wave in proportion to the waveform being sent. In this case, the amplitude modulated wave of x(t) would be represented as C*x(t), where C is a constant.

Explanation
- The correct option is C.x(t) because it represents the modulation of x(t) by a constant C.
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Which of the following statement is NOT correct?
    • a)
      Four terminal is required for measurement of low resistance
    • b)
      For measurement of medium resistance only two terminal is required
    • c)
      To measure high resistance, three terminal is required
    • d)
      To measure high resistance, only one terminal is required
    Correct answer is option 'D'. Can you explain this answer?

    Samridhi Bose answered  •  yesterday
    Explanation:

    Four terminal method for low resistance measurement:
    - Four terminal method is used for measuring low resistances accurately, typically below 1 ohm.
    - This method eliminates errors caused by lead resistances and contact resistances.
    - It requires four terminals - two current-carrying terminals and two voltage-measuring terminals.

    T
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    - Two terminal method is commonly used for measuring medium resistances, typically between 1 ohm to 1 megaohm.
    - It involves passing a current through the resistor and measuring the voltage drop across it using only two terminals.

    Three terminal method for high resistance measurement:
    - Three terminal method is used for measuring high resistances, typically above 1 megaohm.
    - It involves using three terminals - one for applying voltage, one for measuring the current, and one for measuring the voltage across the resistor.
    - This method helps in eliminating errors due to leakage currents and contact resistances.

    Not requiring one terminal for high resistance measurement:
    - The statement that high resistance measurement requires only one terminal is incorrect.
    - To accurately measure high resistances, at least three terminals are required to ensure accurate measurements and eliminate errors.

     Ids depends on
    • a)
      Vg
    • b)
      Vds
    • c)
      Vdd
    • d)
      Vss
    Correct answer is option 'B'. Can you explain this answer?

    Samridhi Bose answered  •  yesterday
    Explanation:

    Ids depends on Vgs:
    - Ids (drain-to-source current) in a MOSFET depends on Vgs (gate-to-source voltage).
    - As Vgs increases, the channel conductivity increases, leading to a higher Ids.
    Therefore, the correct answer is option B) Vgs.

     At threshold Voltage, the surface potential is:
    • a)
      – Fermi potential
    • b)
      Fermi potential
    • c)
      2 Fermi potential
    • d)
      -2 Fermi potential
    Correct answer is option 'A'. Can you explain this answer?

    Samridhi Bose answered  •  yesterday
    Surface Potential at Threshold Voltage
    Understanding the concept of surface potential at threshold voltage is crucial in the field of electrical engineering. Let's break down this concept into key points for better comprehension.

    Threshold Voltage:
    - Threshold voltage is the minimum voltage required to create a conducting channel between the source and drain term
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    Identify the diamagnetic material.
    • a)
      Silicon
    • b)
      Germanium
    • c)
      Silver
    • d)
      Cobalt
    Correct answer is option 'B'. Can you explain this answer?

    Samridhi Bose answered  •  yesterday
    Diamagnetic Material: Germanium
    Diamagnetic materials are those that create a weak magnetic field in the opposite direction of an applied magnetic field. Germanium is a diamagnetic material due to its electron configuration and lack of unpaired electrons.

    Explanation:
    Diamagnetic materials are characterized by the absence of unpaired electrons in their atomic or
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     Approach used for design process are
    • a)
      circuit symbols
    • b)
      logic symbols
    • c)
      stick diagrams
    • d)
      all of the mentioned
    Correct answer is option 'D'. Can you explain this answer?

    Samridhi Bose answered  •  yesterday
    Approach used for design process:
    Designing circuits and logic systems involves the use of various tools and techniques to represent and analyze the components and their interactions. Some common approaches used in the design process include:

    Circuit symbols:
    - Circuit symbols are graphical representations of electrical components and devices used in circuit diag
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    A 50 Hz current has an amplitude of 25 A. The rate of change of current at t = 0.005 after i = 0 and is increasing is ____________
    • a)
      2221.44 A/s
    • b)
      0
    • c)
      -2221.44 A/s
    • d)
      -3141.6 A/s
    Correct answer is option 'B'. Can you explain this answer?

    Prisha Sen answered  •  yesterday
    Given information:
    - Frequency of the current = 50 Hz
    - Amplitude of the current = 25 A
    - Time at t = 0.005 s
    - Initial current i = 0
    - Current is increasing

    Explanation:

    Calculating angular frequency (ω):
    ω = 2πf = 2 x 3.1416 x 50 = 314.16 rad/s

    Finding the current at t = 0.005 s:
    i(t) = I_max * sin(ωt
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    If ‘F’ is the frequency of the analog signal, then what is the minimum sampling rate required to avoid aliasing?
    • a)
      F
    • b)
      2F
    • c)
      3F
    • d)
      4F
    Correct answer is option 'A'. Can you explain this answer?

    Prisha Sen answered  •  yesterday
    Minimum Sampling Rate to Avoid Aliasing
    To avoid aliasing in analog-to-digital conversion, the sampling rate must be at least twice the frequency of the analog signal being sampled. This is known as the Nyquist-Shannon sampling theorem.

    Explanation
    - The Nyquist-Shannon sampling theorem states that in order to accurately reconstruct an analog signal from its sam
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    The efficiency of a welding motor generator is usually in the range of
    • a)
      90 to 95 percent
    • b)
      80 to 90 percent
    • c)
      50 to 60 percent
    • d)
      30 to 45 percent
    Correct answer is option 'C'. Can you explain this answer?

    Raj Singh answered  •  yesterday
    Efficiency of a Welding Motor Generator
    Efficiency of a welding motor generator refers to the ratio of output power to input power, indicating how well the generator converts input energy into usable output energy.

    Range of Efficiency
    - The efficiency of a welding motor generator is typically in the range of 50 to 60 percent.
    - This means that only about hal
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    One lumen per square metre is the same as
    • a)
      one lux
    • b)
      one foot candela
    • c)
      one candela
    • d)
      one lumen metre
    Correct answer is option 'A'. Can you explain this answer?

    Anjali Choudhury answered  •  yesterday
    Explanation:

    One lumen per square metre is the same as one lux
    Lux is the unit of measurement for illuminance, which is the amount of light falling on a surface. One lux is equal to one lumen per square metre. This means that if a surface is illuminated with one lumen of light uniformly distributed over an area of one square metre, the illuminance on that surface is o
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    Which domestic utility item has highest power rating ?
    • a)
      Refrigerator
    • b)
      Ceiling fan
    • c)
      Mixi
    • d)
      Electric Iron
    Correct answer is option 'D'. Can you explain this answer?

    Sravya Khanna answered  •  yesterday
    Electric Iron
    Electric Iron has the highest power rating among the listed domestic utility items.
    Electric Iron typically has a power rating in the range of 1000-2000 watts, which is significantly higher compared to other domestic utility items like Refrigerator, Ceiling fan, and Mixi.

    Power Rating Comparison:
    - Refrigerator: The power rating of a typical re
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    What is the surge impedance of cable?
    • a)
      5 Ω 
    • b)
      20 Ω
    • c)
      10 Ω
    • d)
      50 Ω
    Correct answer is option 'D'. Can you explain this answer?

    Rajesh Saha answered  •  2 days ago
    Surge Impedance of Cable
    The surge impedance of a cable is a characteristic impedance that represents the resistance to the propagation of transient voltage signals along the length of the cable. It is an important parameter in power systems and transmission lines as it determines how effectively a cable can transmit surge currents without experiencing excessive voltage drops.
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    If the system is a three-wire system, the currents flowing towards the load in the three lines must add to ___ at any given instant.
    • a)
      1
    • b)
      2
    • c)
      3
    • d)
      zero
    Correct answer is option 'D'. Can you explain this answer?

    Rajesh Saha answered  •  2 days ago
    Explanation:

    Three-Wire System:
    In a three-wire system, there are three conductors - typically labeled as A, B, and C. These conductors carry the three-phase currents to the load.

    Kirchhoff's Current Law (KCL):
    According to Kirchhoff's Current Law, the algebraic sum of currents entering a node (or a point) in an electrical circuit is zero. This
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    In a star-connected system without neutral grounding, zero-sequence currents are
    • a)
      zero
    • b)
      phasor sum of phase currents
    • c)
      same as rms value of phase currents
    • d)
      same as peak value of phase currents
    Correct answer is option 'A'. Can you explain this answer?

    Rajesh Saha answered  •  2 days ago
    Explanation:

    Star-Connected System without Neutral Grounding:
    In a star-connected system without neutral grounding, the neutral point of the system is not connected to ground. This means that there is no path for zero-sequence currents to flow to ground.

    Zero-Sequence Currents:
    Zero-sequence currents are the currents that flow in the system when
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    Find the inductance of a material with 100 turns, area 12 units and current of 2A in air.
    • a)
      0.75mH
    • b)
      7.5mH
    • c)
      75mH
    • d)
      753mH
    Correct answer is option 'A'. Can you explain this answer?

    Rajesh Saha answered  •  2 days ago
    Calculating Inductance:
    To calculate the inductance of a material with given parameters, we can use the formula for inductance:

    Inductance (L) = (N^2 * μ * A) / l
    Where:
    - N = Number of turns (100 turns)
    - μ = Permeability of air (4π x 10^-7 H/m)
    - A = Area (12 units)
    - l = Length (assumed to be 1 unit in air)
    - Current (I) = 2A

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    Which logic gate is equivalent to these combinations of logic gates
    • a)
      NOR
    • b)
      NAND
    • c)
      AND
    • d)
      OR
    Correct answer is option 'C'. Can you explain this answer?

    Pioneer Academy answered  •  2 days ago
    CONCEPT:
    Logic gates are small electronic circuits that are used to control the output current according to our requirements.
    These are the following symbols to represent logic gates

    These are the Properties of logic gates:
    And gate(.) – It gives us an output one only when both the inputs as 1 otherwise 0
    OR gate(+) – The OR gate gives an output of 1 if either of the two inputs is 1, it gives 0 otherwise.
    NOT gate(‘) – The NOT gate gives an output of 1 input is 0 and vice-versa.
    NOR gate – The combination of NOT and OR gates, so it will have its output reversed.
    NAND gate – The combination of NOT and AND gates, so it will have its output reversed.
    In our logic circuit, we used NOT and NOR in such a way that current from both A and B will pass through NOT gates and then send to the NOR gate hence the Truth table of the following circuit will be:

    This means the output will be always 1 when both inputs are 1, just like the AND gate.

    The hysteresis and eddy current losses in a dc machine running at 1000rpm are 350 nad 100?

    Abhishek Chauhan answered  •  2 days ago



    Explanation of Hysteresis and Eddy Current Losses in a DC Machine

    Hysteresis Losses:
    - Hysteresis losses occur in the core material of the DC machine due to the reversal of magnetization during each cycle of operation.
    - The hysteresis loss is dependent on the magnetic properties of the core material and the frequency of the magnetic
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    There are three boxes. One contains apples, another contains oranges and the last one contains both apples and oranges. All three are known to be incorrectly labelled. If you are permitted to open just one box and then pull out and inspect only one fruit, which box would you open to determine the contents of all three boxes?
    • a)
      The box labelled "Apples‟
    • b)
      The box labelled "Apples and Oranges‟
    • c)
      The box labelled "Oranges‟
    • d)
      Cannot be determined
    Correct answer is option 'B'. Can you explain this answer?

    Abhishek Chauhan answered  •  2 days ago
    Explanation:

    Reasoning:
    - Since all three boxes are incorrectly labelled, we know that the box labelled "Apples and Oranges" cannot contain both fruits.
    - If we open the box labelled "Apples" and find an apple, then that box must contain only apples.
    - This means the box labelled "Oranges" must contain both fruits, as it cannot be oranges only.
    - By pr
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    The critical resistance refers to
    • a)
      the resistance above which machine does not excite
    • b)
      the resistance below which machine does not excite
    • c)
      the resistance at which machine does not excite
    • d)
      any of the mentioned
    Correct answer is option 'A'. Can you explain this answer?

    Abhishek Chauhan answered  •  2 days ago
    The Critical Resistance in Machines
    Explanation:
    Explanation: The critical resistance in machines refers to the resistance above which the machine does not excite. In other words, it is the threshold resistance level that needs to be surpassed in order for the machine to be excited and operate effectively.
    Key Points:
    - Critical Resistance: This is the resistance value that mus
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     What is the dead band of a single pole filter with a pole at 1/2 and represented by 4 bits?
    • a)
      (-1/2,1/2)
    • b)
      (-1/4,1/4)
    • c)
      (-1/8,1/8)
    • d)
      (-1/16,1/16)
    Correct answer is option 'D'. Can you explain this answer?

    Abhishek Chauhan answered  •  2 days ago
    Dead Band of a Single Pole Filter:
    There are different parameters that define the performance of a filter, one of which is the dead band. The dead band of a single pole filter is the range of frequencies around the cutoff frequency where the filter does not attenuate the signal.

    Given Parameters:
    - Pole at 1/2
    - Represented by 4 bits

    Calculati
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    - The dead band of a single pole filter is determined by the pole location.
    - In this case, the pole is at 1/2.
    - The dead band is calculated as the inverse of the pole value.
    - Therefore, the dead band is 1/(2*2^4) = 1/32.

    Representation in Bits:
    - With a representation of 4 bits, the range of values that can be represented is from -1 to 1.
    - Each bit increases the resolution by a factor of 2.
    - Therefore, with 4 bits, the resolution is 1/16.
    - The dead band is within the range of -1/16 to 1/16.

    Conclusion:
    The correct answer is option 'D' (-1/16, 1/16), as this represents the dead band of a single pole filter with a pole at 1/2 and represented by 4 bits.

    The chemical effect of current is used in
    • a)
      D.C. ampere hour meter
    • b)
      D.C. ammeter
    • c)
      D.C. energy meter
    • d)
      none of the above
    Correct answer is option 'A'. Can you explain this answer?

    Sharmila Bajaj answered  •  2 days ago
    Chemical Effect of Current in D.C. Ampere Hour Meter
    The chemical effect of current is utilized in a D.C. ampere hour meter to measure the amount of charge passed through a circuit. This type of meter is commonly used in applications where it is necessary to accurately measure the total charge consumed over a period of time.

    How it Works
    - A D.C. ampere hour mete
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    In free space, which of the following will be zero?
    • a)
      Permittivity
    • b)
      Permeability
    • c)
      Conductivity
    • d)
      Resistivity
    Correct answer is option 'C'. Can you explain this answer?

    Jaya Rane answered  •  3 days ago
    Conductivity in free space:
    Conductivity is the measure of a material's ability to conduct electric current. In free space, there are no free charges to conduct electricity; therefore, conductivity is zero.

    Explanation:
    - In free space, there are no ions or free electrons to carry electric current.
    - Conductivity is directly related to the number of free cha
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    Find the electric force when the charge of 2C is subjected to an electric field of 6 units.
    • a)
      6
    • b)
      3
    • c)
      12
    • d)
      24
    Correct answer is option 'C'. Can you explain this answer?

    Jaya Rane answered  •  3 days ago
    Given data:
    Charge (q) = 2 C
    Electric field (E) = 6 units

    Formula:
    The formula for electric force is given by:
    Electric force (F) = q * E

    Calculation:
    Substitute the given values in the formula:
    F = 2 C * 6 units
    F = 12 units
    Therefore, the electric force when a charge of 2C is subjected to an electric field of 6 un
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    At resonant frequency an R-L-C circuit draws maximum current due to the reason that
    • a)
      the difference between capacity reactance and inductive reactance is zero
    • b)
      the impedance is more than resistance
    • c)
      the voltage across the capacitor equals the applied voltage
    • d)
      the power factor is less than unity
    Correct answer is option 'A'. Can you explain this answer?

    Sanchita Choudhary answered  •  3 days ago
    Explanation:

    Resonant Frequency:
    - Resonant frequency is the frequency at which an R-L-C circuit draws maximum current.

    Reactance at Resonant Frequency:
    - At resonant frequency, the difference between capacitive reactance (Xc) and inductive reactance (Xl) becomes zero.
    - This is because at resonant frequency, the capacitive reactance and in
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    If the readings of the two wattmeters are equal and positive in two wattmeter method, the load pf in a balanced 3-phase 3-wire circuit will be
    • a)
      zero
    • b)
      0.5
    • c)
      0.866
    • d)
      unity
    Correct answer is option 'D'. Can you explain this answer?

    Vaibhav Mukherjee answered  •  3 days ago
    Explanation:

    Two Wattmeter Method:
    In a balanced 3-phase 3-wire circuit, the power can be measured using two wattmeters. When the readings of the two wattmeters are equal and positive, it indicates that the system is balanced.

    Power Factor (PF):
    Power factor is the ratio of real power (W) to apparent power (VA) in a circuit. It is a measure of h
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