# Basic Electrical Engineering Test - Set - 1

1)   In half wave rectifiers, diode conducts during

a. Only positive half cycle
b. Only negative half cycle
c. Both positive and negative half cycle
d. Neither in positive half cycle nor in negative half cycle
 Answer  Explanation  Related Ques ANSWER: Only positive half cycle Explanation: No explanation is available for this question!

2)   Specific resistance of a material is

a. Directly proportional to the both area of cross section and length of material
b. Directly proportional to the area of cross section and inversely proportional to the length of material
c. Inversely proportional to the area of cross section and directly proportional to the length of material
d. Inversely proportional to the both area of cross section and length of material
 Answer  Explanation  Related Ques ANSWER: Directly proportional to the area of cross section and inversely proportional to the length of material Explanation: No explanation is available for this question!

3)   One coulomb of charge is equal to the charge of

a. 1.095 x 10 –19 electrons
b. 1.625 x 10–31 electrons
c. 6.242 x 1018 electrons
d. 6.025 x 10–19 electrons
 Answer  Explanation  Related Ques ANSWER: 6.242 x 1018 electrons Explanation: No explanation is available for this question!

4)   Which among the following is true about ohm’s law?

a. I ∝ V
b. I = V/R
c. V = IR
d. All of these
 Answer  Explanation  Related Ques ANSWER: All of these Explanation: No explanation is available for this question!

5)   In any network of wires carrying currents, the algebraic sum of all currents meeting at a point is equal to

a. Sum of all the currents
b. Zero
c. Sum of outgoing current
d. Sum of incoming current
 Answer  Explanation  Related Ques ANSWER: Zero Explanation: No explanation is available for this question!

6)   Electrical appliances which works on the electromagnetic principle is / are

a. Generators
b. Motors
c. Transformers
d. All of these
 Answer  Explanation  Related Ques ANSWER: All of these Explanation: No explanation is available for this question!

7)   The materials with permeability less than unity are called

a. Diamagnetic materials
b. Paramagnetic materials
c. Ferromagnetic materials
d. Anti ferromagnetic materials
 Answer  Explanation  Related Ques ANSWER: Diamagnetic materials Explanation: No explanation is available for this question!

8)   The magnetic materials which are strongly attracted by the magnet is

a. Diamagnetic materials
b. Paramagnetic materials
c. Ferromagnetic materials
d. Anti ferromagnetic materials
 Answer  Explanation  Related Ques ANSWER: Diamagnetic materials Explanation: No explanation is available for this question!

9)   Permanent magnet are manufactured by

a. Copper sulphate
b. Iron and cobalt
c. Cobalt and nickel
d. ALNICO
 Answer  Explanation  Related Ques ANSWER: ALNICO Explanation: No explanation is available for this question!

10)   The direction of magnetic materials when the current passes through the conductor is determined by

a. Right hand rule
b. Maxwell’s corkscrew rule
c. Left hand rule
d. Only (a) and (b)
 Answer  Explanation  Related Ques ANSWER: Only (a) and (b) Explanation: No explanation is available for this question!

11)   Coulomb’s First Law states that

a. Unlike poles attract each other
b. Like poles repel each other
c. Unlike poles attract each other and like poles repel each other
d. The force between two magnetic poles placed in a medium directly proportional to their pole strengths
 Answer  Explanation  Related Ques ANSWER: Unlike poles attract each other and like poles repel each other Explanation: No explanation is available for this question!

12)   According to the couloumb’s second law, the force between two magnetic poles placed in a medium is

a. Directly proportional to their pole strengths.
b. Inversely proportional to the square of the distance between them
c. Inversely proportional to the absolute permeability of the surrounding medium
d. All of these
 Answer  Explanation  Related Ques ANSWER: All of these Explanation: No explanation is available for this question!

13)   The unit of magnetic flux is

a. Maxwell
b. Weber
c. Weber - m
d. Only (a) and (b)
 Answer  Explanation  Related Ques ANSWER: Only (a) and (b) Explanation: No explanation is available for this question!

14)   Reluctance in a magnetic material is a property by virtue of which it opposes the creation of

a. Electric flux
b. Magnetic flux
c. Electric field density
d. Electric lines of force
 Answer  Explanation  Related Ques ANSWER: Magnetic flux Explanation: No explanation is available for this question!

15)   The unit of magnetizing field intensity is

a. Newton / Weber
b. Ampere - turns / Weber
c. Newton - m / Weber
d. Only (a) and (b)
 Answer  Explanation  Related Ques ANSWER: Only (a) and (b) Explanation: No explanation is available for this question!

16)   One electron charge is equal to

a. 1.925 x 10–31C
b. 1.6019 x 10-19C
c. – 1.925 x 10–31C
d. – 1.6019 x 10–19C
 Answer  Explanation  Related Ques ANSWER: – 1.6019 x 10–19C Explanation: No explanation is available for this question!

17)   According to the coulomb’s law, the force between two point charges is

a. Directly proportional to the product of the charges
b. Inversely proportional to the square of the distance between them
c. Along the line joining them
d. All of these
 Answer  Explanation  Related Ques ANSWER: All of these Explanation: No explanation is available for this question!

18)   Electric field intensity is

a. Directly proportional to the force applied
b. Inversely proportional to the force applied
c. Directly proportional to the permittivity
d. Inversely proportional to the charge
 Answer  Explanation  Related Ques ANSWER: Directly proportional to the force applied Explanation: No explanation is available for this question!

19)   The equation for electric flux density is given by

a. D = εV
b. D = εE
c. D = ε/E
d. D = ε/V
 Answer  Explanation  Related Ques ANSWER: D = εE Explanation: No explanation is available for this question!

20)   Electric flux density is a function of

a. Charge
b. Position
c. Medium
d. Only (a) and (b)
 Answer  Explanation  Related Ques ANSWER: Only (a) and (b) Explanation: No explanation is available for this question!

21)   The most common waveforms of ac is

a. Square
b. Triangular
c. Sinusoidal
d. Saw tooth
 Answer  Explanation  Related Ques ANSWER: Sinusoidal Explanation: No explanation is available for this question!

22)   A radian is defined as the central angle, for which length of its arc

a. Should be greater than radius
b. Should be less than radius
c. Should be equal to the radius
d. None of these
 Answer  Explanation  Related Ques ANSWER: Should be equal to the radius Explanation: No explanation is available for this question!

23)   Peak to peak value of a sine wave is

a. Equal to the maximum or phase value of sine wave
b. Twice the maximum or phase value of sine wave
c. Half of the maximum or phase value of sine wave
d. Four times the maximum or phase value of sine wave
 Answer  Explanation  Related Ques ANSWER: Twice the maximum or phase value of sine wave Explanation: No explanation is available for this question!

24)   The number of instantaneous values between zero and the peak value is

a. Zero
b. One
c. Eleven
d. Infinity
 Answer  Explanation  Related Ques ANSWER: Infinity Explanation: No explanation is available for this question!

25)   If the voltage increases from zero to peak value and decreases back to zero during one alteration, then the average value must be

a. Less than zero
b. Greater than peak value
c. Between zero to peak value
d. None of these
 Answer  Explanation  Related Ques ANSWER: Between zero to peak value Explanation: No explanation is available for this question!

26)   In Fleming’s right hand rule, the direction of the induced emf in the conductor is given by

a. Index figure
b. Middle figure
c. Thumb
d. None of these
 Answer  Explanation  Related Ques ANSWER: Middle figure Explanation: No explanation is available for this question!

27)   Yoke in a dc machine serves the function of

a. Providing mechanical support to the poles
b. Protects the dc machine from harmful atmospheric elements like dust, moisture and gases
c. Offers a path of low reluctances to the magnetic flux produced by the poles
d. All of these
 Answer  Explanation  Related Ques ANSWER: All of these Explanation: No explanation is available for this question!

28)   Laminations or stampings are used to reduce the eddy current losses. The direction of laminations should be such that

a. They are perpendicular to the paths of eddy current and flux both
b. They are parallel to the paths of eddy current and flux both
c. They are perpendicular to the paths of eddy current and parallel to the flux
d. They are parallel to the path of eddy current and perpendicular to the flux
 Answer  Explanation  Related Ques ANSWER: They are perpendicular to the paths of eddy current and parallel to the flux Explanation: No explanation is available for this question!

29)   The terminal voltage in the separately excited generators is given by

a. V = Eg – Ia Ra
b. V = Eg + Ia Ra
c. V = Eg - Ia Ra - If Ra
d. V = Eg + Ia Ra - If Ra
 Answer  Explanation  Related Ques ANSWER: V = Eg – Ia Ra Explanation: No explanation is available for this question!

30)   In a self excited generator, if the series field opposes the shunt field, then the generator is

a. Cumulatively compounded
b. Differentially compounded
c. Series generator
d. None of these
 Answer  Explanation  Related Ques ANSWER: Differentially compounded Explanation: No explanation is available for this question!

31)   Tangent galvanometer can be used to measure

a. Voltage
b. Current
c. Power
d. All of these
 Answer  Explanation  Related Ques ANSWER: Current Explanation: No explanation is available for this question!

32)   Wattmeter is a / an

a. Indicating instrument
b. Integrating instrument
c. Recording instrument
d. All of these
 Answer  Explanation  Related Ques ANSWER: Indicating instrument Explanation: No explanation is available for this question!

33)   The magnetic effect is used in

a. Moving iron attraction type instrument
b. Moving iron repulsion type instrument
c. Electrostatic ammeters and voltmeters
d. All of these
 Answer  Explanation  Related Ques ANSWER: All of these Explanation: No explanation is available for this question!

34)   The springs should be

a. Free from mechanical stress
b. They should have a small resistance
c. Sufficient cross-sectional area
d. All of these
 Answer  Explanation  Related Ques ANSWER: All of these Explanation: No explanation is available for this question!

35)   In gravity control, at the zero position of the pointer the controlling torque is

a. Zero
b. One
c. 0.5
d. 7
 Answer  Explanation  Related Ques ANSWER: Zero Explanation: No explanation is available for this question!

36)   Alternating voltage can be generated by

a. By rotating a coil in a magnetic field
b. By rotating a magnetic field within a stationary coil
c. Either (a) or (b)
d. Neither (a) or (b)
 Answer  Explanation  Related Ques ANSWER: Either (a) or (b) Explanation: No explanation is available for this question!

37)   The amplitude or peak value or maximum value of an alternating voltage is given by the coefficient of the

a. Sine of the time angle
b. Cosine of the time angle
c. Tangent of the time angle
d. Cotangent of the time angle
 Answer  Explanation  Related Ques ANSWER: Sine of the time angle Explanation: No explanation is available for this question!

38)   Root mean square value of current is equal to

a. 1.414 times the maximum value
b. 1.732 times the maximum value
c. Twice the maximum value
d. 0.707 times the maximum value
 Answer  Explanation  Related Ques ANSWER: 0.707 times the maximum value Explanation: No explanation is available for this question!

39)   The ratio of maximum value to effective value of an alternating quantity is called

a. Crest factor
b. Peak factor
c. Amplitude factor
d. All of these
 Answer  Explanation  Related Ques ANSWER: All of these Explanation: No explanation is available for this question!

40)   The two alternating quantities could be added by constructing

a. Squares
b. Parallelograms
c. Rhombus
d. Trapeziums
 Answer  Explanation  Related Ques ANSWER: Parallelograms Explanation: No explanation is available for this question!

41)   The undue deterioration in wiring due to the action of dampness, fumes, weather etc is

a. Appearance
b. Permanence
c. Mechanical immunity
d. Earthing
 Answer  Explanation  Related Ques ANSWER: Permanence Explanation: No explanation is available for this question!

42)   For a two - way position control of lamp, the number of switches required is

a. One
b. Two
c. Three
d. Four
 Answer  Explanation  Related Ques ANSWER: Two Explanation: No explanation is available for this question!

43)   The voltage of the earthed appliance when it is higher and when it is lower than the earth potential will

a. Fall to zero, fall to zero
b. Fall to zero, increase to zero
c. Increase to zero, increase to zero
d. Increase to zero, fall to zero
 Answer  Explanation  Related Ques ANSWER: Fall to zero, increase to zero Explanation: No explanation is available for this question!

44)   Necessity of earthing is to

a. Protect the human being from shock
b. Maintain the line voltage
c. Protect tall building
d. All of these
 Answer  Explanation  Related Ques ANSWER: All of these Explanation: No explanation is available for this question!

45)   The most effective earth plate is

a. Copper plates
b. Cast - iron plates
c. Galvanized iron plates
d. All of these
 Answer  Explanation  Related Ques ANSWER: Copper plates Explanation: No explanation is available for this question!

46)   Three - phase induction motor is more suitable than single - phase because

a. It is self starting
b. Better efficiency compared to single - phase
c. Better power factor compared to single - phase
d. All of these
 Answer  Explanation  Related Ques ANSWER: All of these Explanation: No explanation is available for this question!

47)   Commutator motors have

a. Absolutely uniform torque
b. Approximately uniform torque
c. Non - uniform torque
d. None of these
 Answer  Explanation  Related Ques ANSWER: Non - uniform torque Explanation: No explanation is available for this question!

48)   When windings of 3 - phase induction motor is rotated in a magnetic field, then the emf induced in each phase are of

a. Same magnitude but different frequency
b. Different magnitude but same frequency
c. Same magnitude and same frequency
d. Different magnitude and different frequency
 Answer  Explanation  Related Ques ANSWER: Same magnitude and same frequency Explanation: No explanation is available for this question!

49)   In a 3 - phase star connected balanced induction motor, the line voltage is equal to the

a. 3 times the phase voltage
b. √3 times the phase voltage
c. 1/√3 times the phase voltage
d. 1/3 times the phase voltage
 Answer  Explanation  Related Ques ANSWER: √3 times the phase voltage Explanation: No explanation is available for this question!

50)   In a star connected system, the current flowing through the line is

a. Greater than the phase current
b. Equal to the phase current
c. Lesser than the phase current
d. None of these
 Answer  Explanation  Related Ques ANSWER: Equal to the phase current Explanation: No explanation is available for this question!