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).
Which instruction is used to move the immediate data to the Accumulator (A) in the 8051 microcontroller?
For a 4 : 1 mux, the arrangement is as given below.
Input line 1 is connected to A.
Input line 2 is connected to B.
Input line 3 is connected to D.
Input line 4 is connected to C.
The two select lines are shorted to D. The output equation realised using the MUX is:
When testing an SCR in a simple DC circuit, which method correctly verifies that the device is functioning?
The main DISADVANTAGE of an analog CRO compared to a digital CRO is
Which of the following statements about electromagnetic relays is correct?
Why is a steel rule considered as a line standard and a slip gauge as an end standard?
Quantum efficiency of an optical detector refers to the
The configuration of an AC to DC converter and a DC to AC inverter is called a/an
Which instrument is commonly used to measure the resistance of a coil?
Which of the following statements is correct?
Which fastening method is quickly removable and reusable?
Why insulation resistance test should be done on underground cables before and after installation?
While calibrating a CRO, the ________ signal of the built-in or external generator is used to verify time and amplitude settings.
Which of the following correctly lists the three terminals of a Unijunction Transistor (UJT)?
In a rewirable type fuse, the fuse element is
Which of the following statements about an injection laser diode (ILD) used for optical communications is correct?
The oxy-acetylene flame is preferred for sheet metal fabrication work because
The maximum current a photovoltaic cell can produce under a given illumination is known as the:
In the 8051 microcontroller, which register is not directly addressable through instructions?
If the DC load line of a fixed bias BJT CE configuration intersects the Y axis at 4 mA and X-axis at 10 V on the output characteristics, then determine the value of the resistance $R_C$ if saturation voltage between collector and emitter is 0.2 V.
A carpenter is working on a project that involves cutting a straight line on a piece of plywood. Which of the following hand tools would be the most suitable for this task?
Determine the value of the average current for a half-wave rectifier designed using SCR and having a firing angle of 90 degrees, if the peak value of the output current is 1 Amperes.
The capacitance of a capacitor can be checked using
The supply voltage to a UJT oscillator is 10 V, the valley voltage of the UJT is 8 V, and the valley current is 0.2 m A. Determine the minimum value of R and the time constant if $C=100\ \mu\text{F}$.
In a lead-acid battery, multiple thin plates are used instead of single thick plates in order to