Prepare for BHEL Artisan (Electronics Mechanic) recruitment examination with official previous years' solved questions across Basic Electrical & AC Fundamentals, Passive & Active Components, Semiconductor Devices (Diodes, BJTs, MOSFETs), Power Electronics & Converters (SCR, TRIAC), Digital Electronics, Electronic Instruments (CRO, Multimeter), SMPS & Inverters, and Industrial Soldering Standards.
Marking pattern: +1.00 positive, -0.25 negative (Official BHEL Artisan CBT Scheme).
Identify the FALSE statement related to LED TVs.
Which of the following is an advantage of underground cables over overhead lines?
In solder grading, a solder labeled as Sn60Pb40 indicates
Before measuring voltage with a digital multimeter (DMM), the first step is to
In a colour TV signal, the luminance (Y) component represents ________ while the chrominance carries ________.
The LCD TV is ________ than the OLED TV and provides ________ picture quality than the traditional CRT TV.
Which of the following statements is correct regarding batteries?
What is the main disadvantage of a half-wave rectifier compared with a full-wave rectifier?
Determine the average value of the half-wave rectified signal observed on a CRO screen if the signal occupies 5 units on y-axis with V/div pointer placed on 2 V/div.
The static bypass switch in a UPS block diagram is mainly used to
Which type of inductor is commonly used in RF (radio frequency) circuits due to its low core losses?
A 5000 mAh battery discharged at 2A will theoretically last
Which block in the block diagram of an op-amp is responsible for rejecting the common-mode signals?
In the 8051 microcontroller, the Accumulator (A) register is part of the Special Function Registers (SFRs). What is its direct address in the internal data memory space?
The cross-cut chisel differs from the flat chisel mainly because
In a Cathode Ray Oscilloscope (CRO), the Y-gain control is set to 2 V/div. If a sine wave signal causes a vertical deflection of 3.5 divisions from peak to peak, what is the peak voltage of the signal?
In mobile devices, a Planar Inverted-F Antenna (PIFA) is often used. Which of the following statements about PIFA operation and performance is INCORRECT according to the given text?
In a 555 timer working as a PWM generator, the timing capacitor charges from
To implement an AND gate using only NOR gates, a minimum of how many NOR gates are required?
Matching the optical sources with their features.
| Optical source | Features |
|---|---|
| I. LED | A. Highly inflammable |
| II. LASER | B. Incoherent |
| C. Highly directional | |
| D. Requires insulation to protect it from electromagnetic field |
Consider the following statements and select the correct option.
Statement I: Direct measuring instruments, like a ruler or micrometer, provide a reading directly related to the object being measured.
Statement II: Indirect measuring instruments, such as calipers, transfer measurements from the object to a direct measuring tool.
A single-phase energy meter is connected to a load where the current lags the voltage by 60°. Which of the following statements about the energy meter is correct?
Which of the following best describes persistence of vision?
Two switches are connected to operate a light such that the switch on the top floor in closed condition can create a close loop for a switch on the ground floor in closed condition. Then, the given arrangement reflects a/an
What is the primary difference between a monostable multivibrator and a bistable multivibrator configuration of the 555 timer IC?