List of top Questions asked in OJEE- 2025

The impulse response of an LTI system can be obtained by

For a periodic signal $v(t) = 30\sin(100t) + 10\cos(300t) + 6\sin(500t + \pi/4)$, the fundamental frequency in rad/s is

Consider a DC voltage source connected to a series R–C circuit. When the steady-state reaches, the ratio of the energy stored in the capacitor to the total energy supplied by the voltage source, is equal to

A network contains linear resistors and ideal voltage sources. If values of all the resistors are doubled, then the voltage across each resistor is

The nodal method of circuit analysis is based on

Consider the signal $x(t) = \cos(6\pi t) + \sin(8\pi t)$, where $t$ is in seconds. The Nyquist sampling rate (in samples/second) for the signal $y(t) = x(2t + 5)$ is

A modulated signal is $y(t) = m(t)\cos(40000\pi t)$, where the baseband signal $m(t)$ has frequency components less than $5$ kHz only. The minimum required rate (in kHz) at which $y(t)$ should be sampled to recover $m(t)$ is

A series LCR circuit consisting of $R = 10\Omega$, $|X_L| = 20\Omega$ and $|X_C| = 20\Omega$, is connected across an a.c. supply of $200\,\text{V}_{\text{rms}}$. The rms voltage across the capacitor is}

If each branch of a Delta circuit has impedance $\sqrt{3}\,Z$, then each branch of the equivalent Wye circuit has impedance

If $\mathcal{L}\{f(t)\} = F(s)$, then $\mathcal{L}\{f(t - T)\}$ is equal to,

A load that has a resistance of 10 ohms is to be connected to a supply that has a constant voltage of 120 volts. If it is desired that the current to the load be varied from 3 to 5 amperes, what are the resistance and the current rating of the series rheostat that permit this variation?

To a highly inductive circuit, a small capacitance is added in series. The angle between voltage and current will,

A 12-pole, 3-phase, 50 Hz induction motor runs at 475 rev/min. Determine the slip speed and frequency of the rotor currents.

A dc generator running at 30 rev/s generates an e.m.f. of 200 V. Determine the percentage increase in the flux per pole required to generate 250 V at 20 rev/s.

A 5000 kVA, 1100 V, 50 Hz, Y-connected 3-phase alternator has armature resistance of 0.1 $\Omega$/phase and synchronous reactance of 1.5 $\Omega$/phase. Find the generated emf per phase, power factor is unity.

If the number of poles of an alternator is increased, the generated e.m.f.

Determine the torque developed by a 350 V d.c. motor having an armature resistance of 0.5 $\Omega$ and running at 15 rev/s. The armature current is 60 A.

The power supplied to a three phase induction motor is 32 kW and stator losses are 1200 W. The slip is 5%, determine the rotor copper loss.

The no. of equations and variables in Peirce’s geometry

Dimethyl formamide (DMF) at boil is a solvent for

Nylon-4 is made by the polymerisation of

A 6 kVA, 100 V/500 V, single phase transformer has a secondary terminal voltage of 485.50 Volts when loaded. Determine the regulation of the transformer.

A three-phase transformer has 600 primary turns and 150 secondary turns. If the supply voltage is 1.5 kV determine the secondary line voltage on no-load when windings are connected in delta-star.

A single phase transformer is rated at 40 kVA. The transformer has full-load copper losses of 800 W and iron losses of 500 W. Determine the transformer efficiency at half full-load and 0.8 power factor.

Decortication is related with