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).
Inter-base resistance of UJT is of the order of:
Which of the following is NOT a valid advantage of a single bus bar system?
For a Linear Time Invariant (LTI) system, in the absence of the input, the output tends towards zero (zero) irrespective of initial conditions. This type of stability is called:
A half-wave rectifier using a silicon diode has a secondary EMF of 14.14 V (RMS) with a resistance of $0.15\;\Omega$. The diode has a forward resistance of $0.05\;\Omega$ and a threshold voltage of 0.7 V. If the load resistance is $8\;\Omega$, determine the efficiency.
In a Bode plot, if the value of the phase at gain crossover frequency is $-125^{\circ}$, then the phase margin of the system is:
Which of the following theorems states that every square matrix $\mathbf{A}$ satisfies its own characteristic equation?
The continuous-time two-sided exponential signal is shown in the figure below:
The Fourier transform of the signal $x(t) = e^{-a|t|}$ (where $a > 0$) is:
If poles are more than zeros in $G(s)$, then the number of root locus branches is equal to the:
Consider the closed-loop control system represented below:
What will be the natural frequency ($\omega_{n}$) for the above controller-plant closed-loop system?
If the voltage to be handled is ________, then switchgear equipment is installed outdoor.
What will be the effect of increasing load of a synchronous motor while running with normal excitation?
Which of the following properties is NOT true for the curl?
Consider the circuit diagram of a buck-boost converter shown below:
The voltage across the capacitor in this buck-boost converter is $v_C$. The differential equation for this variable is:
1. A system is said to be completely controllable if it is possible to transfer the system state from any initial state $X(t_0)$ to any desired state $X(t_1)$ in specified finite time by a control vector $u(t)$.
2. A system is said to be completely observable, if every state $X(t_0)$ can be completely identified by measurements of the outputs $y(t)$ over the time interval $(0 \le t \le \infty)$.
Read the above two statements and select the correct option.
In cascade form realisation of FIR system, _________ adders and _________ multipliers are required for (M-1)th order FIR transfer function.
Study the given statements with reference to single phase induction motor and select the appropriate option.
1. Single-phase induction motor is a self-starting machine.
2. Double-revolving field theory can be used for performance analysis of 1-phase induction motors.
Which of the following is NOT a method of computation of linear convolution?
The layers in the middle layer of artificial neutral networks are known as:
6 dB corresponds to a frequency response with magnitude equal to:
1. Artificial neutral networks play an important role in speech recognition.
2. Artificial neutral networks are used for handwritten character recognition.
Read the above statements and select the correct option for artificial neutral networks.
How many unconditional jump instructions are there in an 8051 microcontroller?
The Laplace transform of $[e^{-at} \cos(\omega_0 t)] u(t)$ is:
How many T-states can be there in a machine cycle in 8085 microprocessors?
Which of the following flags is used for BCD arithmetic in the architecture of 8085 microprocessor?
The apparent power is the product of the ________ values of voltage and current.