Prepare for the BHEL Engineer Trainee (ET Electrical) recruitment examination with official previous years' solved question papers across Electric Circuits & Fields, Electrical Machines (Turbo-Generators, Synchronous & Induction Motors, Transformers), Power Systems (Generation, EHV Transmission, Grid Stability & Switchgear Protection), Control Systems, Power Electronics & HVDC Transmission, Electrical & Electronic Measurements, Analog & Digital Electronics, and General Engineering Aptitude.
Marking pattern: +1.00 positive, -0.25 (1/4th) negative marking (Official BHEL Engineer Trainee Computer-Based Test Scheme).
What is the primary condition that must be satisfied for an oscillator circuit to sustain oscillations, in terms of voltage gain?
Which of the following expressions describes the displacement current density?
Identify the correct statement related to peak overshoot parameter for a second order control system.
Determine the maximum voltage the capacitor can charge if the Series RC circuit is exited by a step function of amplitude 'V' volts.
If a transformer operates under no-load conditions, what will the primary current mainly consist of?
For a right-sided sequence $x[n]$, what is the Region of Convergence (ROC) of its Z-transform?
Which of the following is an application of an adder circuit?
Voltage regulation in short transmission lines is usually very low because:
What is latching current in an SCR?
The frequency of induced rotor current in a squirrel cage induction motor at full load is typically:
What is the transformation ratio of the teaser transformer in a Scott connection?
What effect does the positive temperature coefficient of channel resistance in MOSFETs have?
Voltage cancellation in current source inverters involves:
In the equivalent circuit of a transformer, what is the primary reason for considering leakage reactance?
The purpose of grading in underground cables is to:
The coordination of overcurrent relays in a protection system is designed to:
Which of the following correctly represents the Discrete-Time Fourier Transform (DTFT) of a discrete-time signal $x[n]$?
The transfer function $H(s)$ of an LTI system is defined as:
Select the correct option based on the given statements.
Statement 1: An independent voltage source maintains a constant voltage across its terminals regardless of the current drawn from it.
Statement 2: An independent current source maintains a constant current regardless of the voltage across its terminals.
What is the typical voltage gain (magnitude) of a MOSFET common-source amplifier?
Consider the following statements and select the correct option.
Statement 1: When an RL circuit is connected in parallel with an RC circuit, the total current in the circuit will be the sum of the individual currents in both the branches.
Statement 2: The total impedance of the parallel combination of RL and RC circuits is always less than the impedance of the individual RL or RC circuits.
Which of the following statements about slip in an induction motor is correct?
Select the correct option based on the given statements.
Statement 1: The resonance frequency of a series R-L-C circuit is dependent on the resistance (R), inductance (L) and capacitance (C).
Statement 2: At resonance, the impedance of a series R-L-C circuit is at its minimum value.
Select the correct option based on the given statements.
Statement 1: The reciprocity theorem states that in a linear network, the current in one branch due to a voltage source in another branch is the same as the current that would flow if the voltage source were in the second branch and the load were in the first branch.
Statement 2: The reciprocity theorem is only applicable for circuits with resistive elements.
A discrete-time LTI system is stable if the Region of Convergence (ROC) of its Z-transform: