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).
Find the relation between output voltage ($V_O$) and input voltage ($V_{\text{in}}$) for a Boost converter, where $d$ is the duty ratio.
Which of the following are valid fuzzy operators defined in fuzzy set theory?
Which of the following is NOT a characteristic of an ideal transformer?
What will be the damping ratio ($\zeta$) in a series RLC circuit excited by a DC source?
Find the percentage reactance for an element if the full load current is 50 A and the short circuit current is 250 A, when only that element is in the circuit.
Consider the resistance firing circuit for an SCR shown below:
The circuit is connected to an AC supply $v = 50 \sin(\theta)$ and $R_L = 100\;\Omega$. Gate current is $100\;\mu\text{A}$ and $V_G = 0.5\text{ V}$. Determine the range of adjustment of $R$ for the SCR to be triggered between $30^{\circ}$ and $90^{\circ}$. Take $V_D = 0.7\text{ V}$.
Consider the step response curves shown below:
The line marked as X is the closed loop response of:
Which of the following is most similar to the principle of operation of a 3-phase induction motor?
Which of the following plots is NOT used in frequency response analysis?
Consider the circuit shown below:
Find the time constant for the circuit.
Consider the circuit shown below:
The switch S is closed at $t = 0\text{ (zero)}$. The complete response for $i(t)$ for $t > 0\text{ (zero)}$ is:
The ratio of back EMF to voltage of a DC motor is an indication of:
Consider the Schmitt trigger circuit shown below:
In the Schmitt trigger circuit shown, $V_{CE(\text{sat})} = 0.1\text{ V}$. The output logic low level is:
Read the statements and select the correct option pertaining to the load flow analysis.
1. The diagonal element of each node is the negated admittance between the nodes.
2. The off-diagonal element is the sum of the admittances connected to it.
A 3-phase transmission line is being supported by three disc insulators. The potentials across the top unit and middle unit are 8 kV and 11 kV, respectively. Calculate the ratio of capacitance between pin and earth to the self-capacitance of each unit.
A coil of 16 H is coupled with a coil of 4 H in such a way that coefficient of coupling is unity. Find the mutual inductance.
Consider the single-phase full-bridge inverter circuit shown below:
What will be the output voltage of this single-phase full bridge inverter when the switches $S_2$ and $S_3$ are turned on?
Find the equation for critical disruptive voltage ($V_d$) for local and general corona on a 3-phase overhead transmission line, where:
Which of the following conversions is obtained with the help of Gauss divergence theorem?
What is the given circuit known as?
What type of feedback is used in the OP-AMP for it to operate as a comparator?
Which of the following conditions is NOT a true derivative of Ampere's circuit law?
If the poles of a closed-loop are complex with positive real parts, then the system is:
Which of the following is NOT true according to Faraday's experiments?
Determine the gain at the breakaway point for the open-loop transfer function $G(s)H(s) = \frac{K}{s(s+1)}$.