List of top Questions asked in OJEE

If each branch of a Delta circuit has impedance $\sqrt{3}\,Z$, then each branch of the equivalent Wye circuit has impedance
To a highly inductive circuit, a small capacitance is added in series. The angle between voltage and current will,
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.
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.
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 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.
Nylon-4 is made by the polymerisation of
Dimethyl formamide (DMF) at boil is a solvent for
The no. of equations and variables in Peirce’s geometry
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 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.
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.
The terry towel is
During drawing crystallinity of a fibre
The viscose solution should have a viscosity
Tenacity of polynosic in g/den
Decortication is related with
Willowing machine is required in the processing of
The correlation coefficient between packing density and porosity of a set of yarn is
Two cotton fibre varieties A and B having linear density of 3.2 and 4 (microgram/inch) respectively are tested on air flow instrument. The highest flow rate is obtained in case of
The cross section of spinneret used for producing hollow fibre
Mountaineering rope should have
The strength utilization of yarn in a woven fabric is