All India Electrical Engineering (EE) Group

Two p-n junction diodes are connected back to back to make a transistor. Which one of the following is correct?
  • a)
    The current gain of such a transistor will be high
  • b)
    The current gain of such a transistor will be moderate
  • c)
    It cannot be used as a transistor due to large base width
  • d)
    It can be used only for p-n-p transistor
Correct answer is option 'C'. Can you explain this answer?

Poulomi Chopra answered  •  16 hours ago
Understanding the Back-to-Back P-N Junction Diode Configuration
When two p-n junction diodes are connected back-to-back, they create a junction that does not function like a traditional transistor. Below are key points explaining why this configuration cannot effectively be used as a transistor.
Large Base Width
- The primary reason this configuration cannot serve as a
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Which of the following diode is used for voltage stabilization?
  • a)
    P – N junction
  • b)
    Zener
  • c)
    Tunnel
  • d)
    PIN
Correct answer is option 'B'. Can you explain this answer?

Poulomi Chopra answered  •  16 hours ago
Understanding Diodes for Voltage Stabilization
In the realm of electrical engineering, diodes serve various purposes, and one of the most effective types for voltage stabilization is the Zener diode. Here’s a detailed explanation of why the Zener diode is the correct answer.
Zener Diode Functionality
- The Zener diode is specifically designed to operate in the reverse
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A tuned amplifier is used:
  • a)
    In audio amplification
  • b)
    For noise removal in radio signals
  • c)
    In radio receivers
  • d)
    None of the above
Correct answer is option 'C'. Can you explain this answer?

Poulomi Chopra answered  •  16 hours ago
Understanding Tuned Amplifiers
Tuned amplifiers are specialized circuits designed to amplify signals at specific frequencies while minimizing the amplification of others. They play a crucial role in various applications, particularly in radio frequency (RF) communications.
Key Applications of Tuned Amplifiers:
- Audio Amplification: While tuned amplifiers can be
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For a type one system, the steady-state error due to step input is equal to
  • a)
    zero    
  • b)
    0.75
  • c)
    infinite    
  • d)
    0.50
Correct answer is option 'A'. Can you explain this answer?

Aman Jain answered  •  yesterday
Understanding Type One Systems
In control system theory, a Type One system is characterized by having one integrator in its open-loop transfer function. This integrator impacts the system's response to inputs, particularly steady-state errors.
Steady-State Error Explained
- Definition: Steady-state error is the difference between the desired output and the actua
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Phase crossover frequency is defined at
  • a)
    ∠G(jω) H(jω) = -180°
  • b)
    ∠G(jω) H(jω) = 0º
  • c)
    ∠G(jω) H(jω) = 90°
  • d)
    ∠G(jω) H(jω) = 180°
Correct answer is option 'A'. Can you explain this answer?

Jaya Rane answered  •  yesterday
Understanding Phase Crossover Frequency
The phase crossover frequency is a crucial concept in control systems and signal processing. It indicates the frequency at which the phase of the open-loop transfer function reaches -180 degrees.
Definition
- The phase crossover frequency is defined mathematically as:
- ∠G(jω) H(jω) = -180 degrees
This means that a
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