Top 40 electrical que and ans

1➤ Two quadrant type B chopper operates in:

2nd and 4th quadrants3rd and 4th quadrants1st and 4th quadrants 1st and 2nd quadrants

2➤ Which of the Following is NOT a characteristic of PMMC instruments? .

High accuracyNon-uniform scaleNo hysteresis lossUsed for DC measurements only

3➤ Exponential signal is an example of

Random and non-periodic signal.Random and periodicDeterministic and periodicDeterministic and non-periodic

4➤ Which of the following method of tariff was proposed by John Hopkinson? .

Block meter rateFlat demand rateTwo part tariffThree part tariff

5➤ How is the transient current in a loss free RLC circuit ?

SinusoidalSquare wave Non- oscillatingOscillating

6➤ Amplitude of antisymmetric signal is--------at the origin

Always negative Always zeroAlways positiveEither positive or negative but not zero

7➤ Which of the following is true for gravity control as a controlling force for measuring instruments? .

The instrument need not be levelledIt is dependent of temp variationsIt can be used only in vertically mounted instrumentsSince deflection is directly proportional to the current it has a uniform scale.

8➤ What is the unit of measurement used to measure the air gap between the rotor and stator of the starter motor?

MilAngstromPlank lengthMillimetre

9➤ Which of the following is NOT true for the shell type transformer?

magnetic circuit is divided in two or more partsThe coils used are of cylindrical typeBoth HV and LV windings are placed on a central limbA core has three limbs

10➤ Which of the following CANNOT be a cause for the creeping error in induction type single-phase energy meter?

VibrationStray magnetic fieldsOver-compensation for frictionExtremely low voltage across the potential coil

11➤ Identify the non-renewable source of energy among the given option.

Biomass energySolar energyGeothermal energyNuclear energy

12➤ Calculate the resolution of a 3-digit 0-1 V digital voltmeter.

0.010.00010.0010.1

13➤ In an oil circuit breaker, due to heat the oil decomposes and the gases are liberated. Which of the following gas is usually NOT liberated in this process?

AmmoniaHydrogenMethaneAcetylene

14➤ In a hollow tube, if the velocity of air is constant everywhere inside the tube then the divergence of the velocity field is

UnityZeroNegativeInfinite

15➤ As per force-voltage analogy, mass and viscous friction in mechanical translational system are analogous to______and______in electrical system, respectively.

Capacitance, inductanceResistance, capacitanceInductance, resistanceInductance, capacitance

16➤ For a second order system having its transfer function as: H(s) = 25/(s²+8s+25) Find the damping factor.

0.80.40.50.6

17➤ Which of the following device is bidirectional?

PUTDIACSUSSCS

18➤ A power plant has the annual factors given as: load factor = 70 percent, Capacity factor = 50 percent, Use factor = 60 percent. If maximum demand is 20 MW, find the reserve capacity over and above the peak load. .

28 MW14 MW 8 MW6 MW

19➤ What is advantage of high voltage transmission lines?

Increasing voltage is not an advantage at all because it involves expensive equipment to step up voltage initially and then step down later increasing the voltage reduces the current in transmission and distribution lines reducing the distribution lossesincreasing voltage leads to higher current which in turn leads to bulk carriage of power over long distances None of these

20➤ Which of the following theorems is used to identify the resistance of the speaker that must be matched to the audio power amplifier to obtain the highest output? .

Millman's TheoremMaximum Power Transfer theorem (mppt)Compensation TheoremReciprocity Theorem

21➤ What is the current through an element at t=2 sec, if the charge entering the element is q = 10 t C?

10 A10t² A 5t² A 20 A

22➤ In an HVDC system:

both generation and distribution are ac.generation is dc and distribution is acgeneration is ac and distribution is dcboth generation and distribution are dc

23➤ In double cage Induction motor, rotor is so designed to provide

Low starting torque, with high starting current.High starting torque, with low starting currentHigh starting torque, with high starting current.Low starting torque, with low starting current.

24➤ Wein bridge finds application in

Resistance measurement only Frequency determinationHarmonic distortion analyserb and C both.

25➤ In series-parallel combination of resistance, the minimum number of resistance required is

threefourtwoone

26➤ is measure of closeness in shape between a waveform and its fundamental component. .

Distortion factorLowest order harmonicsHarmonic factorTotal harmonic distortion

27➤ __of a conductor is a very high amplitude, low- frequency type of conductor motion and occurs mainly in areas of relatively flat terrain under freezing rain and icing of conductors.

Resonant vibrationGalloping vibrationWake induced oscillationAeolian vibration

28➤ A power amplifier supplies 50 W to an 8 2 speaker. Find ac output voltage and ac output current..

12.5 V. 4 A50 V, 1 A1.25 V, 2 A2.20 V, 2.5

29➤ Which one of the following (A.C.S.R) conductors is having lowest cross-sectional area?

DogZebraPantherDeer

30➤ To reduce commutation difficulties universal motor are designed with

Moderate magnetic fieldVery strong magnetic fieldWeak magnetic fieldCommutation problem does not depend on strength of magnetic field

31➤ Convert (B68)16 in to equivalent octal number.

(5050)(5555)(5550)(4550)

32➤ Which of the following statements is true for the synchronous motor?

Requires DC excitation at rotorEconomical for speeds above 600RPMSpeed decreases with loadOperate at lagging power factor

33➤ The lines of force due to charged particles are

sometimes curved.always straightalways curvedNone of these

34➤ Which of the following characteristic is not desirable in measuring instrument?

AccuracyDriftRepeatabilityLinearity

35➤ Which of the following device does not belong to thyristor family?

GTORCTUJTSITH

36➤ In a magnetic circuit, the ratio of flux to m.m.f represents

ReluctanceResistanceReactancePermeance

37➤ Which of the following is not a VALID advantage of digital filters over analog filters? .

Higher bandwidthLess maintenanceLinear phase response Higher flexibility

38➤ A single phase full bridge inverter has a supply voltage of 100 V dc. What will be the peak reverse blocking voltage of each thyristor? .

400 V200 V 100 V50 V

39➤ The breakaway points of the root-loci of a polynomial equation can occur

On imaginary axis onlyAt origin onlyAnywhere on the complex plane On real axis only

40➤ With the help of____the surface integral can be converted into a volume integral.

Coulomb's lawMaxwell's theoremGauss's lawDivergence theorem

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