The question asks about the application of Buchholz's relay. To answer this, one needs to know the specific equipment that Buchholz's relay is designed to protect.
Correct Option: D) transformer protection. Buchholz's relay is a vital protective device exclusively used for oil-immersed transformers to detect internal faults.
The question asks about the primary function of the stator frame in an induction motor. We need to understand the construction and operational principles of an induction motor to identify the correct role of its stator frame.
C) as a return path for flux. The stator frame, made of ferromagnetic material, provides a low-reluctance path for the magnetic flux to complete its circuit, thereby ensuring efficient operation of the motor.
This question tests knowledge about the basic construction and operation of single-phase AC motors, specifically the location of their windings.
Correct Option: D) stator
The question asks for another name for the process of galvanising, which involves applying a layer of zinc to a metal surface. We need to identify the electrochemical process that achieves this.
C) electroplating. Electroplating is the process of depositing a thin layer of a metal onto a conductive surface using an electric current. When zinc is deposited onto iron or steel using this method, it is known as electro-galvanising, which is a type of galvanising. Therefore, electroplating is the most appropriate general term for applying a metal layer like zinc onto another metal surface using an electrical process.
The question asks which logic gate can be constructed using a single transistor. We need to recall the basic configurations of logic gates and how they are implemented using transistors.
A single transistor can be configured as a NOT gate (inverter). When the input to the base (or gate) of the transistor is high, it conducts, and the output (collector or drain) becomes low. When the input is low, the transistor does not conduct, and the output becomes high (assuming a pull-up resistor is used). This directly implements the NOT logic function.
This question tests knowledge of Boolean algebra and the standard notation used to represent logical gates. We need to identify the expression that correctly symbolizes the logical AND operation.
D) A.B — This expression uses the dot operator (\(.\)), which is the standard and most common way to represent the logical AND operation in Boolean algebra. For example, if \(A=1\) and \(B=1\), then \(A \cdot B = 1\). If \(A=1\) and \(B=0\), then \(A \cdot B = 0\).
The question asks for the term describing substances that generate a potential difference (voltage) when exposed to light. This phenomenon is central to how solar cells work.
Correct Option: A) photo voltaic material
Photovoltaic materials are semiconductors that exhibit the photovoltaic effect, meaning they generate an electric current and voltage when exposed to light. This is the fundamental principle behind solar panels.
The question asks to identify the most commonly used control element in voltage regulators. We need to evaluate the suitability of each given option for this specific application.
A) BJT — Bipolar Junction Transistors are widely used as series pass elements or shunt elements in linear voltage regulators. Their ability to operate in the active region and control current flow makes them ideal for maintaining a stable output voltage.
The question asks for the ideal Common Mode Rejection Ratio (CMRR) in a differential amplifier. We need to understand what CMRR represents and its significance in amplifier performance.
A) infinity — An ideal differential amplifier perfectly rejects common-mode signals, meaning its common-mode gain is zero. Since CMRR is the ratio of differential gain to common-mode gain, an ideal CMRR is infinity.
To convert a decimal number to its binary equivalent, we use the method of successive division by 2. We divide the decimal number by 2, note down the remainder, and continue dividing the quotient by 2 until the quotient becomes 0. The binary equivalent is then obtained by reading the remainders from bottom to top.
Thus, the decimal number 14 is equivalent to binary 1110.
A) 1110 is the correct binary representation of the decimal number 14, as derived from the successive division method.