Prepare for AVNL Executive CBT with official questions covering Electrical Machines, Industrial Power Distribution, Drives & Traction Systems, Switchgear & Relays, Power Electronics, and Control Instrumentation.
Marking scheme: +1.00 positive, 0.00 negative marking (AVNL CBT Pattern).
If a single-phase AC series motor designed for $230\text{ V}$ is operated at $115\text{ V}$ AC with unchanged load torque, what modification is necessary to maintain performance?
A transformer has a base power of $100\text{ kVA}$ and a base voltage of $400\text{ V}$ on the secondary side. The actual impedance of the transformer on the secondary side is $0.4\ \Omega$. What is the impedance in per unit on the secondary side?
In a buck-boost converter, how does the output voltage compare to the input voltage?
A $50\ \mu\text{F}$ capacitor has been charged from a $200\text{ V}$ DC supply. The energy stored in the capacitor will be:
A unity feedback second-order system has the transfer function:
$$C(s) = \frac{16}{s^2 + 4s + 16}$$If the system is subjected to a unit step input, which of the following is the approximate settling time in seconds (s) using the 2% criterion?
Which method uses determinants to solve a system of linear equations?
In a synchronous motor operating at constant mechanical load, if the excitation is increased, the power factor:
If the surface charge density $\sigma$ (charge $Q$ per unit area) is uniformly distributed over a thin spherical shell of radius $R$, what is the electric potential $V$ at a point at a distance of $r < R$ from the centre (i.e., inside the shell)?
Electrodynamometer instruments operate based on:
For a series RLC resonant circuit, calculate the bandwidth (in $\text{rad/sec}$) of the circuit with the following circuit elements:
$R = 40\ \Omega$, $L = 1\text{ mH}$, and $C = 0.005\text{ mF}$
A system described by $y(t) = 2x(t) + 5y(t)$ is:
Expression for Sum output in a Full adder is
Which component is mostly neglected in reactance diagram of a power system network?
If $\beta(x, y) = \frac{\Gamma(x)\Gamma(y)}{\Gamma(x+y)}$, then $\beta(3, 2) = ?$
A pole-zero pattern of a transfer function with one or more zeroes in the right half s-plane is known as _____ phase transfer function.
Which type of fault is double line to ground fault?
What is the correct relationship between the electric flux density D and the electric field intensity E in free space?
When a transistor is operated in the cut off region, then the emitter base junction is in _____ condition.
Compute the differentiation of the continuous time signal $x(t) = t \cdot u(t)$ where $u(t)$ is the unit step signal.
What is the function of the series inductance in the motor legs of a dual converter?
Select the correct option with regard to the statement given below.
A conducting surface has a non-uniform surface charge distribution.
What does the Critical Clearing Time (CCT) represent in a power system?
Modified McMurray Bedford half bridge inverter is also known as:
The divergence of a vector field is mathematically expressed as:
_____ is also called step-down chopper as average output voltage $V_o$ is always less than the input dc voltage $V_s$.