Prepare for UPSC Indian Engineering Services (IES/ESE) with official previous years' questions, detailed derivations, phasor analysis, and circuit solutions across Electrical Machines, Power Systems, Control Systems, Power Electronics, Network Theory, and Analog & Digital Circuits.
Marking pattern: +2.00 positive, -0.66 negative (Official UPSC ESE 1/3rd Negative Marking Scheme; 150 Questions, 300 Marks).
Which one of the following never dissipates energy but only stores it?
An ideal voltage source is defined as energy source whose terminal voltage (V) is
Norton's theorem states that any two-terminal linear network with current sources, voltage sources and resistances can be replaced by an equivalent circuit consisting of a
An ideal voltage source is a two-terminal element in which the
A circuit consists of a voltage source with 50 V and an internal resistance of $25\,\Omega$. If a load is connected to the voltage source, the maximum power drawn by the load resistance of $25\,\Omega$ will be
When a series R-L circuit is connected to a voltage V at $t=0$, the current passing through the inductor L at $t=0^{+}$ is
Which of the following statements for a balanced 3-phase circuit are correct?
Select the correct answer.
In a 3-phase balanced star-connected system, the line voltages are
Which of the following conditions for a 2-port symmetrical electrical network are correct? (Assume standard notations)
Select the correct answer.
Consider the following network function:
$$H(s) = \frac{10s}{s^2 + 300s + 10^6}$$
The quality factor Q is
Three capacitors of capacitances $10\,\mu\text{F}$, $20\,\mu\text{F}$ and $40\,\mu\text{F}$ are connected in series across 280 V. The charge of each capacitor will be
Which one of the following standards is used to check and calibrate laboratory instrument for accuracy and performance?
The expected value of the voltage across a resistor is 80 V. However, the measurement gives a value of 79 V. The percentage of accuracy will be nearly
A meter will give a lower indication of the voltage drop that actually existed before the meter was connected. This effect is called
The basic permanent magnet moving coil (PMMC) mechanism is often called
In frequency division multiplexing, a typical telemetry carrier frequency of 230 MHz is used with a bandwidth of
The potential transformer is used to operate voltmeters, potential coils of wattmeters and relays from
The output power wattmeter is designed to measure the output power
The nominal ratio $K_n$ for a current transformer is
Which one of the following generates an electrical signal directly in response to the physical parameter and does not require an external power source for its operation?
The output voltage of LVDT is 1.5 V at maximum displacement. At a load of $0.5\text{ M}\Omega$, the deviation from linearity is maximum and it is $\pm 0.003\text{ V}$ from a straight line through origin. The linearity at the given load will be
Force-summing devices are used
Which one of the following can act as inverse transducer, when a voltage is applied across its surfaces?
What is the full form of the following expression?
$$Y = \Pi M(0, 1, 3, 4)$$
Which one of the following operators replaces certain statements of the if-then-else form in C/C++?