Most Expected EE MCQ for all competitive exams

1➤ Which of the following diodes operates with a forward biased metal-semiconductor junction?

Schottky diodePIN diodeGunn diodeTunnel diode

2➤ Which of the following diodes is a PNPN device with two terminals?.

Light emitting diode Shockley diodeTunnel diodeZener diode

3➤ In how many regions can the biased transistor work? .

FiveTwoThreeFour

4➤ __________is not an application of electrolysis.

ElectroplatingElectro-facingAnodizingBrazing

5➤ According to Faraday's law of electrolysis, mass (M) is equals to

ZATZITZSTZFT

6➤ The Electroplating is an example for the of the electric current..

chemical effectmagnetic effectheating effectphysical effect

7➤ Basically, electroplating means:

The electrodeposition of metal on electrodesThe electrodeposition of metal upon metallic surfaces The formation of ions by two metallic plates in the acidic liquidNone of the above

8➤ What is the frequency of the generated EMF in a six-pole alternator running at 1200 rpm?

30 Hz 50 Hz 60 Hz40 Hz

9➤ Which of the following terms is NOT associated with diodes?

GateDepletion regionCathodeAnode

10➤ Speed control of single-phase series motor (AC) can be done by:

Frequency variationShifting of brushesVoltage variationPole changing

11➤ In a regular graph, the number of branches is 10. Find the number of Nodes in the Graph.

5421

12➤ The detrimental effects of Armature reaction CANNOT be controlled by:

decreasing the length of air gapreducing the cross section of pole pieces using commutation poles providing the machine with a compensating winding

13➤ In a digital voltmeter, the oscillator frequency is 400 kHz. A ramp voltage to be measured by this voltmeter falls from 8V to OV in 20 ms. The number of pulses counted by the counter is.

3200160040008000

14➤ The averaged dc voltage of a half wave of the value of the rectifier circuit is peak input voltage.

31.8%6.2%4.8%63.6%

15➤ What is the main component of driving system part of Energy meter? .

Center limbElectric Fuse ElectromagnetSilicon steel

16➤ As compared to a split phase motor, a capacitor start motor has

Higher running torque Lower starting torque Higher starting torqueNone of these

17➤ An encoder has_____input lines _____ output lines

n, n² 2^n,nn, 2^n n², 2

18➤ If an induction type energy meter runs fast, it can be slowed by:

Adjusting the position of braking magnet and making it move away from the centre of the discmagnet and making it come closer to the centre of the discLight load adjustment Adjusting the position of brakingLag adjustment

19➤ Which of the following types of instruments is an integrating instrument?

Energy meterPower-factor meterWattmeterFrequency meter

20➤ Convert (23)⁸ into its decimal number.

818197

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