A student multiplied a number by 4/5 instead of 5/4. What is the percentage error in the calculation?
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What is to be added to 40% of 900 so that the sum must be equal to 30% of 2600?
The average weight of A, B and C is 55 kg. If the average weight of A and B be 50 kg and that of B and C be 53 kg, then the weight of B is
Hydrogen is used in large alternators mainly to-
Which one of the following is a valid value of coefficient of coupling between two inductors?
Non-metallic conduit for wiring are generally made of-
A 500 KVA transformer has constant loss of 500W and copper losses at full load are 2000W. Then at what load, is the efficiency maximum?
The stator winding of an alternator is normally connected in star to eliminate the ____harmonic component of the voltage waveform.
The minimum clearance between the ground and a 220 KV line is about-
The positive sequence reactance will be equal to negative sequence reactance in case of-
If the number of valence electrons of an atom is 4 then the substance is usually?
The secondary load impedance of a step-up transformer is ZS The primary impedance ZP will be
In a 50 kVA transformer, the iron loss is 500 W and full-load Cu loss in 800 W. The efficiency of the transformer at full-load at 0.8 p.f. lagging is
To avoid the effect of the stray magnetic field in AC bridges, we can use-
The starting resistance of a D.C. motor is generally-
From a uniform light source of 500 CP, a surface 15 meter below, find the value of illumination when rays are inclined at an angle to (60°) to the surface.
Three equal impedances are first connected in delta across a 3-phase balanced supply. If the same impedances are connected in star across the same supply-
Which one of the following is a speed control method of their phase squirrel cage induction motor?
Two coupled coils connected in a series have an equivalent inductance of 16 mH or 8 mH depending on the connection. The mutual inductance between the coil is