Top Electrical Engg MCQ - 500+ MCQ
381
The core flux in transformer depends mainly on
382
Determine the value of self-inductance (in mH) of a 6-centimetre long air-cored solenoid, if the coil has 240 turns and the diameter of the coil is 4 cm.
383
A sinusoidal quantity can be expressed as :
384
An AC source is applied to a pure inductive circuit. What is the active power consumed by the circuit?
385
In a DC machine, interpoles are connected:
386
The coil having a resistance of 5 ohm and inductance of 38.22 mH is connected to 220 V, 50 Hz supply. Calculate the current (in A) flowing in the circuit.
387
Which of the following single-phase induction motors is generally used in time phonographs?
388
In a parallel LC resonant circuit (tank circuit), the impedance at the resonant frequency is:
389
The color of light emitted by a source depends completely on its:
390
What will be the value of current I₁ (in A) for the diagram given below?
391
Soft magnetic materials are characterized by having:
392
Which type of fan is called as fresh air fans
393
The standard unit of Apparent Power in an AC circuit is:
394
The Plant Capacity Factor of a power station is the ratio of:
395
For a 6-pole D.C. machine with wave wound armature, the number of brushes required is
396
The luminous efficiency of a sodium vapor lamp is highest among gas discharge lamps. It typically emits light of which color?
397
If starting winding of a single-phase induction motor is left in the circuit, it will
398
Lissajous figures displayed on a Cathode Ray Oscilloscope (CRO) screen are used to determine:
399
The speed of the rotating magnetic field in an induction motor is known as the
400
Which of the following motors can be used for unity power factor?