Electrical Studys

1) What is the direction of the electric field at a point?

1 pointA. Along the line perpendicular to the electric fieldB. Along the line tangent to the electric fieldC. Electric field has no directionD. Electric field has a random direction

2) What is the magnitude of mutually induced emf, E2 in a transformer?

1 pointA. directly proportional to rate of change of flux and number of secondary turnsB. inversely proportional to rate of change of flux and number of secondary turnsC. proportional to rate of change of flux and inversely proportional to number of secondary turnsD. inversely proportional to the rate of change of flux and proportional to number of secondary turns

3) Which of the following will happen in a transformer when the number of secondary turns is less than the number of primary turns?

1 pointA. The voltage gets stepped upB. The voltage gets stepped downC. The power gets stepped upD. The power gets stepped down

4) What is the number of primary turns in a 200/1000 V transformer if the emf per turn is 10V?

1 pointA. 5 B. 10C. 20 D. 40

5) Which of the following is a correct representation of average value in an AC Circuit?

1 pointA. RMS value/Form factorB. RMS value*Form factorC. RMS value/Peak factorD. RMS value*Peak factor

6) Who defined electric current and devised a method to measure current?

1 pointA. Michael FaradayB. Andre-Marie AmpereC. Nikola TeslaD. Alessandro Antonio Volta

7) Which of the following is correct about direct current?

1 pointA. Magnitude is constantB. Frequency is zeroC. Can be transported to larger distances with less loss in powerD. Flows in one direction

8) Who witnessed the effect of magnetism for the first time?

1 pointA. Hans Christian OrstedB. Alexander Graham BellC. Michael FaradayD. Gustav Robert Kirchhoff

9) Which of the following according is correct about electrical conductivity?

1 pointA. It is the ratio of current density to the electric fieldB. It is the product of current density and electric fieldC. It is the ratio of the electric field to current densityD. It is the reciprocal of the product of current density and electric field

10) What is responsible for the current to flow?

1 pointA. ProtonsB. ElectronsC. NucleusD. Protons and Electrons

11) Which of the following according to KCL must be zero?

1 pointA. Algebraic sum of currents in closed-loopB. Algebraic sum of power in closed-loopC. Algebraic sum of currents entering and leaving a junctionD. Algebraic sum of voltages across the input and output

12) How many directions can the electric field at a point have?

1 pointA. Zero B. OneC. TwoD. Many

13) Which of the following will happen in a transformer when the number of secondary turns is greater than the number of primary turns?

1 pointA. The voltage gets stepped upB. The voltage gets stepped downC. The power gets stepped upD. The power gets stepped down

14) Which of the following type of circuits in electrical engineering cannot be analyzed using Ohm’s law?

1 pointA. Unilateral B. BilateralC. LinearD. Conductors

15) Which of the following is correct about the voltage transformation ratio in electrical engineering?

1 pointA. Ratio of number of primary turns to the number of secondary turnsB. Ratio of induced emf in secondary to induced emf in primaryC. Ratio of secondary current to the primary currentD. Ratio of power in primary to power in secondary

16) How does induce emf in DC motor react to supply voltage?

1 pointA. It will aid the supply voltageB. It will be double the supply voltageC. It will oppose the supply voltageD. It will be half of the supply voltage

17) Which of the following according to KVL must be zero?

1 pointA. Algebraic sum of currents in closed-loopB. Algebraic sum of power in closed-loopC. Algebraic sum of losses in closed-loopD. Algebraic sum of voltages in closed-loop

18) Which of the following is not an expression power?

1 pointA. P=VI B. P=I2RC. P=V2/RD. P=I/R

19) Which of the following statements are true?

1 pointA. Power is proportional to voltage onlyB. Power is proportional to current onlyC. Power is neither proportional to voltage nor to the currentD. Power is proportional to both the voltage and current

20) A 250V bulb passes a current of 0.3A. Calculate the power in the lamp.

1 pointA. 75W B. 50WC. 25WD. 90W

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