NTA UGC NET/JRF Exam, February-2023 (Electronic Science)

List-I matches with List-II as:

(a) Direct memory addressing data memory - IV. MOV BX, [2000 H]
In direct memory addressing mode, the operand's address is explicitly given in the instruction itself, as seen in MOV BX, [2000 Н].

(b) Immediate Addressing - I. MOV [SI], 2500 H
In immediate addressing mode, the operand's value is directly given in the instruction, such as MOV [SI], 2500 H where 2500 H is the immediate data.

(c) Flag Manipulation - II. PUSHF
PUSHF is an instruction used to push the flags onto the stack, which is directly related to flag manipulation.

(d) Control transfer - III. RET
RET is a control transfer instruction which pops the return address from the stack and transfers control to that address.

The beam width between half power points specifies how "directed" the antenna's beam is, usually the smaller the beam width, the more directed the antenna.

(a) Uniformly illuminated linear Array - IV.
Linear arrays have radiation patterns and beamwidths dependent on the element spacing and type.

(b) Uniformly illuminated circular aperture - I.
The beam width is derived from the diameter of the circular aperture.

(c) Optimum E-plane rectangular horn - II.
E-plane usually corresponds to the electrical field direction and has its specific pattern.

(d) Optimum H-plane rectangular horn - III.
H-plane is orthogonal to the E-plane and the beamwidth varies accordingly.

These devices are semiconductor components.

(a) DIAC - IV. A DIAC is a bidirectional trigger diode, which can switch AC voltages.

(b) TRIAC - I. The TRIAC is essentially a more complex DIAC, capable of handling larger currents and used extensively in AC power control applications.

(c) ASCR - II. ASCR, also known as an SCR or Silicon Controlled Rectifier, is a unidirectional device. It's primarily used in rectification and switching.

(d) LASCR - III. Light Activated SCR, or LASCR, is triggered by photons (light).

List-I matches with List-II as:

(a) Relative error -II. The ratio of the difference between measured value and the true value to the true value of the measurand. Relative error gives a perspective of the error in comparison to the true value.

(b) Precision - I. The ability of the device to give identical O/P when repeated measurements are made with the same I/P signal. Precision ensures repeatability of measurements.

(c) Calibration - IV. The process of making adjustments or the scale so that the instrument reading conforms to an accepted standard. Calibration is crucial for ensuring that devices produce accurate and consistent readings.

(d) Resolution - III. The smallest increment in measure that can be detected with certainty by the instrument. Resolution is about the finest detail an instrument can discern.

Ga, In, As, and Sb have atomic numbers 31, 49, 33, and 51 respectively. So the sequence is:
Ga (c) →31, In (b)→ 49, As (a) →33, and Sb (d) → 51.

Semiconductors are vital for modern electronics, and the atomic number is a fundamental property which dictates how an element behaves in electronic applications. Doping semiconductors with specific elements can change their conductive properties.

The design flow of VLSI (Very-LargeScale Integration) is sequential. It typically starts with:

(a) Functional Design & verification: Here, the overall function and performance of the circuit are determined.

(c) Logic Design & verification: The functional design is then translated into a logic design format. This step involves creating logical representations of the circuit.

(b) Circuit Design & verification: This phase translates the logic design into an actual circuit design.

(d) Physical Design: This phase focuses on the physical layout of the circuit on the silicon wafer.

(e) Layout verification: The final design is verified to ensure it meets the desired specifications and does not have any errors.

VLSI has revolutionized electronics by allowing millions of transistors to be integrated into a single chip, like microprocessors.

Either question or options is wrong.

The flow in the basic block diagram of an op-amp is:

(d) Dual-Input balanced output differential amplifier block: This is the first stage, which amplifies the difference between the two input signals.

(b) Dual input unbalanced output differential amplifier block: Provides additional amplification and converts balanced to unbalanced output.

(c) Emitter follower with constant current source block: Provides current gain and voltage buffering.

(a) Complementary symmetry push-pull amplifier block: Provides the final amplification and ensures that the output can drive both positive and negative values efficiently.

Op-Amps are versatile electronic components used in a wide range of applications from audio systems to control systems.

For implementing the minimum SOP (Sum of Products) in a PLA (Programmable Logic Array):

(c) Prepare a PLA program table format indicating inputs, product terms, and outputs: This is the initial step to understand the logic requirements.

(a) Mark the input connections of AND Matrix to generate the required product terms: The AND matrix identifies the products.

(d) Mark the input connections of OR matrix to generate the required output (sum) terms: Following the AND matrix, the OR matrix produces the final sum output.

(b) Mark the connections required for invert/ non-invert matrix for setting an active high to active low output: This ensures the output is correctly polarized.

PLA provides a way to implement logical functions and can be reprogrammed to implement various logical operations.