All India Electrical Engineering (EE) Group

Which of the following characteristics is NOT desirable for the ideal op-amp?
  • a)
    Infinity voltage gain
  • b)
    zero slew rate
  • c)
    zero off-set voltage
  • d)
    Infinite Input impedance
Correct answer is option 'B'. Can you explain this answer?

Hrishikesh Yadav answered  •  4 hours ago
Characteristics of an Ideal Op-Amp
An operational amplifier (op-amp) is a fundamental component in electronic circuits. The ideal op-amp is characterized by several key features that define its operation.
Desirable Characteristics
- Infinity Voltage Gain: An ideal op-amp should amplify any input signal without limitation, providing infinite open-loop gain.
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The flux linkage in coil 1 is x Wb-t and it has 500 turns and the current in coil 2 is 2A, calculate the value of x if the mutual inductance is 750H.
  • a)
    1Wb-t
  • b)
    2Wb-t
  • c)
    3Wb-t
  • d)
    4Wb-t
Correct answer is option 'C'. Can you explain this answer?

Anirban Chawla answered  •  11 hours ago
Understanding Mutual Inductance
Mutual inductance is a measure of the influence that one coil has on another coil when the current through one coil changes. It is defined as the ratio of the induced electromotive force (emf) in one coil to the rate of change of current in the other coil.
Given Data
- Flux linkage in coil 1: x Wb-t
- Number of turns in coil 1: 500
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How many standard resistor are required to design a 3 bit flash type ADC? 
  • a)
    7
  • b)
    8
  • c)
    6
  • d)
    3
Correct answer is option 'C'. Can you explain this answer?

Mahesh Datta answered  •  yesterday
Understanding Flash Type ADC
A flash ADC (Analog-to-Digital Converter) is known for its speed and simplicity. It converts an analog voltage to a digital code in a single step, using multiple comparators.
Components of a 3-bit Flash ADC
To design a 3-bit flash ADC, we need to determine the number of comparators and the number of resistors required.
Number of Com
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- For an n-bit ADC, the number of output levels is 2^n.
- Hence, for a 3-bit ADC, there are 2^3 = 8 output levels.
- To determine the number of comparators required, we use the formula: Number of Comparators = 2^n - 1.
- For 3 bits: 2^3 - 1 = 7 comparators.
Resistor Ladder Network
To create the reference voltage levels for the comparators, a resistor ladder is employed. The resistor ladder divides the reference voltage into equal parts.
Number of Resistors Required
- For n-bit ADCs, the number of resistors needed in the ladder is equal to the number of comparators.
- Therefore, for 7 comparators, we need 7 resistors.
- However, the resistor ladder will have 1 additional resistor to create the last reference voltage.
- Thus, the total number of resistors needed is 7 + 1 = 8.
Conclusion
- Therefore, the correct answer for the number of standard resistors required to design a 3-bit flash type ADC is 8 (Option C).
- This configuration ensures all comparators have appropriate reference levels for accurate conversion.

For a transistor in common emitter configuration the reverse leakage current is 21uA whereas when the same transistor is connected in common base configuration it reduce to UA find out the value of adc and bdc of the transist... more

Bhavana Reddy answered  •  yesterday
Understanding Transistor Configurations
In this scenario, we are analyzing a transistor's performance in common emitter and common base configurations. The reverse leakage current changes from 21μA in common emitter to a smaller value in common base.
Key Parameters of Transistor
- Reverse Leakage Current (I_CBO): This is the current that flows from the collecto
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A coil is said to be loosely coupled with which of the following conditions?
  • a)
    K>1
  • b)
    K<1
  • c)
    K>0.5
  • d)
    K<0.5
Correct answer is option 'D'. Can you explain this answer?

Gitanjali Deshpande answered  •  yesterday
Understanding Coupling in Coils
In electrical engineering, coupling refers to the interaction between two inductive components, typically coils or transformers. The degree of coupling is quantified by a parameter known as the coupling coefficient, denoted as K.
What is the Coupling Coefficient (K)?
- K ranges from 0 to 1.
- K = 0 indicates no coupling (independen
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The group wavelength is greater than the wavelength at any point. State true/false.
  • a)
    Ture
  • b)
    False
Correct answer is option 'A'. Can you explain this answer?

Gitanjali Deshpande answered  •  yesterday
Understanding Group Wavelength vs. Individual Wavelength
The statement that "the group wavelength is greater than the wavelength at any point" is indeed True. Let’s break down this concept for clarity.
What is Group Wavelength?
- The group wavelength refers to the wavelength of the overall wave packet or group of waves traveling together.
- It represents t
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Number of parallel path in wave winding is:
  • a)
    2
  • b)
    3
  • c)
    4
  • d)
    6
Correct answer is option 'A'. Can you explain this answer?

Rithika Pillai answered  •  yesterday
Understanding Wave Winding
Wave winding is a method used in electrical machines, particularly in DC machines, to wind the coils on the armature. It is characterized by a specific arrangement that influences the performance and efficiency of the machine.
Number of Parallel Paths
In wave winding, the number of parallel paths can be determined by the following:
-
... more: Wave winding typically consists of coils that are spread out over the armature and are interconnected in a way that forms a wave-like pattern.
- Poles and Coils: The number of parallel paths in wave winding is directly related to the number of poles. For a wave-wound armature, the general rule is that there are two parallel paths for each pair of poles.
- Formula Application: If 'P' represents the number of poles, the number of parallel paths (A) in wave winding can be expressed as:
A = 2
Therefore, for any configuration of wave winding, the number of parallel paths remains constant at 2.
Conclusion
Thus, the correct answer to the question regarding the number of parallel paths in wave winding is indeed option 'A', which is 2. This understanding is essential for electrical engineers when designing and analyzing DC machines.

 An IIR system with system function H(z)=(B(z))/(A(z)) is called a minimum phase if:
  • a)
    All poles and zeros are inside the unit circle
  • b)
    All zeros are outside the unit circle
  • c)
    All poles are outside the unit circle
  • d)
    All poles and zeros are outside the unit circle 
Correct answer is option 'A'. Can you explain this answer?

Uday Saini answered  •  2 days ago
Understanding Minimum Phase Systems
A minimum phase system is characterized by its pole-zero configuration in the z-plane. The key features of such systems are essential for stability and performance in signal processing.
Definition of Minimum Phase
- A system is classified as minimum phase if:
- All zeros of the system function H(z) are located inside the unit c
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Which of the following is the application of lattice filter?
  • a)
    Digital speech processing
  • b)
    Adaptive filter
  • c)
    Electroencephalogram
  • d)
    All of the mentioned
Correct answer is option 'D'. Can you explain this answer?

Uday Saini answered  •  2 days ago
Understanding Lattice Filters
Lattice filters are a specific type of digital filter with applications across various fields, including digital signal processing, adaptive filtering, and medical diagnostics. Here’s how they apply to the options provided:
Digital Speech Processing
- Lattice filters are used in digital speech processing to enhance speech signals and reduc
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