BASIC ELECTRICAL MOSTLY ASKED 125 QUESTIONS
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Here we providing second part of Basic Electrical mostly asked questions and answers PDF, All questions of this PDF have asked mostly times. Some questions and answers from PDF is following given for full 125 questions please download full PDF.
1. What will be the resistance if 10 resistors of 10 ohm each is connected in series
(A)100 ?
(A) length
(A) joule/sec
(A) DC circuits
(B) high currents
(A) Ohms
(A) Equal to load resistance
(C) More than that of the load
(A) Passive elements only
(C) Linear elements only
(A) Superposition
(A) Nodes
(A) Zero source resistance
(C) Terminal voltage is proportional to current
(D) Open-circuit voltage nearly equal to voltage of the load current
(D) Figure D.ANSWER-B
14. A passive element in a circuit is one which
(A)Receives energy
(B) Supplies energy
(C) both supplies and receives energy
(D) none
ANSWER-A
15.Unit of electric potential
(A) Ampere
(B) Volts
(C) coulomb
(D) Volt-ampere
ANSWER-B
BASIC ELECTRICAL MOSTLY ASKED 125 QUESTIONS
16. If a flux of ? Weber’s links with a coil of N turns , the induced voltage in the coil is given by
(A) N d?/dt
(B) -N d?/dt
(C) NBlu
(D) none
ANSWER-B
17. Whenever there is a relative motion of a coil & a magnetic field, a voltage is induced in the coil. Such
a voltage is called
(A) Statically induced voltage
(B) Dynamically induced voltage
(C) Self-induced voltage
(D) Mutually induced voltage
ANSWER-B
18. The polarity of the induced voltage is determined by
(A) Ampere’s law
(B) Lenz’s law
(C) Kirchhoff’s law
(D) Right hand rule
ANSWER-B
27. Two resistances R1 and R2 give combined resistance of 4.5 ohms when in series and 1 ohm when in parallel. The resistances are
(A) 3 ohms and 6 ohms
(B) 3 ohms and 9 ohms
(C) 1.5 ohms and 3 ohms
(D) 1.5 ohms and 0.5 ohms
ANSWER-C
BASIC ELECTRICAL MOSTLY ASKED 125 QUESTIONS
28. A Material having a charge of 12 coloumbs over 6 second what is current flowing through the material
A) 3 AMPS
B)2 AMPS
C) 4 AMPS
D) 10AMPS
ANSWER-B
29. The Potential Difference between Two terminals of Resistor is 10V, Current flowing is 5A, What is the value of Resistance
A) 2
B) 1.5
C) 1.5
D) None Of These
ANSWER-A
30. Four resistors each of 20 are connected in parallel, the total resistance is
A) 80
B) 5
C) 5
D) None Of These
ANSWER-C
BASIC ELECTRICAL MOSTLY ASKED 125 QUESTIONS
31. OneFarad Is Equal To
A) 1
B) 1 V/C
C) 1C/V
D) None Of These
ANSWER-C
32. Two resistors each of 4 and 12 are connected in parallel and the parallel combination is connected in series with a 2 resistor. What is the Equivalent Resistance?
A) 50
B) 5
C) 20
D) 2
ANSWER-B
33. The unit of resistance is
A) Ohms
B) Volts
C) Amperes
D) Tesla
ANSWER-A
BASIC ELECTRICAL MOSTLY ASKED 125 QUESTIONS
34. Circuit is defined as
A) Interconnection Of Circuit Elements With Closed Path
B) Interconnection Of Circuit Elements With Out Any Closed Path
C) Interconnection Of With Out Circuit Elements
D)None of these
ANSWER-A
35. In Series Connection of elements Parameter is Same
a) Current
b)Voltage
c) Power
d)None of these
ANSWER-A
36. In parallel Connection of elements Parameter is Same
a) Current
b)Voltage
c) Power
d)None of these
ANSWER-A
BASIC ELECTRICAL MOSTLY ASKED 125 QUESTIONS
37. A Loop in a Circuit is defined as a
a) Closed path
b) Junction point of two or more branches
c) inter connected elements
d) All of these
ANSWER-A
38. KCL is applicable at
a) A Junction
b) Resistor
c) Loop
d) All of these
ANSWER-A
39. KVL is applicable at
a) A Junction
b) Resistor
c) Closed Loop
d) All of these
ANSWER-C
40. Super-Position Theorem is applicable for a
a) Linear Bilateral Network
b) Non- Linear Bilateral Network
c) Linear Uni-ateral Network
d)All the above
ANSWER-A
BASIC ELECTRICAL MOSTLY ASKED 125 QUESTIONS
41. Faradays- First law the induced EMF is
a) Dynamically Induced EMF
b) Statically Induced EMF
c) Eddy EMF
d) None of these
ANSWER-A
42. Faradays- second law the induced EMF is
a) Dynamically Induced EMF
b) Statically Induced EMF
c) Eddy EMF
d) None of these
ANSWER-B
43. The direction of dynamically Induced EMF can be determined with the help of
a) Lenz’s Law
b) Flemings Left Hand Rule
c) Flemings Right Hand Rule
d) None of these
ANSWER-B
44. The self inductance is written as follows
a) L=NØ/I
b) L=Ø/I
c) L=V/dI/dt
d) All
ANSWER-D
45. Thevenin’s Voltage is
a) Open circuit voltage
b) Short Circuit Voltage
c) Closed Circuit voltage
d) None of these
ANSWER-A
BASIC ELECTRICAL MOSTLY ASKED 125 QUESTIONS
46. Ohm’s Law is Applicable at Conditions
a) Constant Temperature
b) Constant Pressure
c) Constant Volume
d) None of These
ANSWER-A
47. The unit of inductance is
a) ohms
b) Volts
c) Amperes
d) Henry
ANSWER-D
48. The unit of capacitance is
a) ohms
b) Farads
c) Amperes
d) Tesla
ANSWER-D
49. An inductor stores energy
a)Electrical energy
b) Magnetic energy
c) mechanical energy
d) All
ANSWER-D
50. Magnetic flux has he unit of
a) Newton
b) Ampere turn
c) Weber
d) Tesla
ANSWER-C
BASIC ELECTRICAL MOSTLY ASKED 125 QUESTIONS
51.If E1 = Asin?t and E2 = Asin(?t – ?), then
A)E1& E2 are in phase
B) E2 lags E1by ?
C) E1 lags E2by ?
D) E2 lags E1by 900
ANSWER-B
52.The equation for 25 cycles current sine wave having rms value of 30 amps, will be
A) 42.4sin50?t
B) 42.4sin25?t
C) 30sin25?t
D) 30sin25?t
ANSWER-A
53.The rms value of sinusoidal voltage wave V = 200sin?t, is
A) 200/?2 V
B) 100/?2 V
C) 200?2 V
D) 100?2 V
ANSWER-A
54.The value of supply voltage for 400 W, 4 ? load is
A) 40 V
B) 20 V
C) 100 V
D) 1600 V
ANSWER-A
BASIC ELECTRICAL MOSTLY ASKED 125 QUESTIONS
55. What is represented by the hypotenuse of impedance triangle?
A) Impedance drop
B) Resistance
C) reactance
D)apparent power
ANSWER-A
56. The phase angle difference between current and voltage is 90°, the power will be
A) zero
B) maximum
C)minimum
D)VI
ANSWER-A
57. A series R – L – C circuit has R = 1 ?, L = 1 H and C = 1 F connected across a voltage and line current is 1 A, find energy consumed in one hour
A) 36 J
B)360 J
C)3600 J
D)1 J
ANSWER-C
58. Power consumed in Resistor is
A)VI
B)VIcos?
C)VI sin?
D)VI tan?
ANSWER-B
59.In pure inductive circuit current voltage by 90
A)lead
B)lag
C)in phase with
D) none
ANSWER-B
BASIC ELECTRICAL MOSTLY ASKED 125 QUESTIONS
60.power consumed by capacitor is
A)VI
B) 0
C) VI sin?
D) VIcos?
ANSWER-B
11.RMS Value of sinusoidal Voltage is
A) Vm/2^
B) 0
C) VI /sin?
D) VI/cos?
ANSWER-A
12. Average Value of sinusoidal Voltage is
A) Vm/2^
B) 2Vm/2^
C) VI /sin?
D) VI/cos?
ANSWER-B
13. Form factor of sinusoidal Voltage is
A) 1.11
B) 2
C) 3
D) 4
ANSWER-A
14. Peak factor of sinusoidal Voltage is
A)1.11
B) 2
C)2^
D) 4
ANSWER-C
BASIC ELECTRICAL MOSTLY ASKED 125 QUESTIONS
15. Direction of Induced EMF is given by
A)Flemings Right hand rule
B) Flemings Left hand rule
C)Faraday Law
D) Lenzs Law
ANSWER-A
16.The direction of magnetic field is from
A)North-south
B) South-North
C)Both
D)None of these
ANSWER-A
17. Power factor Cos?=
A)ZR
B)RZ
C)R/Z
D)Z/R
ANSWER-C
18. In symmetrical wave RMS Value is calculated for
A) one Alternation
B) Full Cycle
C)Both
D) None
ANSWER-A
19. For Half wave Rectifier Second alternation is
A)ZERO
B) Positive
C)Negative
D) None
ANSWER-A
BASIC ELECTRICAL MOSTLY ASKED 125 QUESTIONS
20.50HZ Means
A) 1 cycle/sec
B) 2 Cycles/sec
C)50 Cycles/sec
D)50 Cycles/min
ANSWER-C
21. How many cycles does a sine wave go through in 10s when its frequency is 60HZ
(A)10 cycles
(B) 60 cycles
(C) 600 cycles
(D) 6 cycles
ANSWER-C
22. If the peak value of a certain sine wave voltage is 10V, what is the peak to peak value?
(A) 20V
(B) 10V
(C) 5V
(D) 7.07V
ANSWER-D
23. If the peak value of a sine wave voltage is 5V, then rms value is
(A) 0.707V
(B) 3.535 V
(C) 5V
(D)1.17V
ANSWER-B
24. A phasor represents
(A)Magnitude of the quantity
(B)width of the quantity
(C) Magnitude & direction of the quantity
(D) Phase angle of quantity
ANSWER-C
BASIC ELECTRICAL MOSTLY ASKED 125 QUESTIONS
25. The form factor is the ratio of
(A) peak value to r.m.s. value
(B)r.m.s. value to average value
(C) average value to r.m.s. value
(D) none
ANSWER-B
26. Two waves of the same frequency have opposite phase when the phase angle between them Is
(A)360°
(B) 180°
(C) 90°
(D) 0°
ANSWER-B
27. True Power Is Also Called As
(A) Active Power
(B) Real Power
(C) Reactive Power
(D) Both A &B
ANSWER-D
28. Peak Factor Gives
(A) Peak Value To R.M.S. Value
(B) Average Value To Peak Value
(E) R.M.S. Value To Average Value
(D) R.M.S. Value To Peak Value
ANSWER-A
29. For A Frequency Of 200 Hz, The Time Period Will Be
(A) 0.05 S
(B) 0.005 S
(C) 0.0005 S
(D) 0.5 S
ANSWER-B
BASIC ELECTRICAL MOSTLY ASKED 125 QUESTIONS
30. Power Factor Of An Electrical Circuit Is Equal To
(A) R/Z
(B) Cosine Of Phase Angle Difference Between current And Voltage
(C) Kw/Kva
(D) Ratio Of Useful Current To Total Currrent iw/I
(E) All Above
ANSWER-E
31. The Apparent Power Drawn By An A.C. Circuit Is 10 Kva And Active Power Is 8 Kw. The Reactive Power In The Circuit Is
(A) 4 Kvar
(B) 6 Kvar
(C) 8 Kvar
(D) 16 Kvar
ANSWER-B
32. In An A.C. Circuit Power Is Dissipated In
(A) Resistance Only
(B) Inductance Only
(C) Capacitance Only
(D) None Of The Above
ANSWER-A
33. A Phasor Is
(A) A Line Which Represents The Magnitude And Phase Of An Alternating Quantity
(B) A Line Representing The Magnitude And Direction Of An Alternating Quantity
(C) A Coloured Tag Or Band For Distinction Between Different Phases Of A 3phase Supply
(D) An Instrument Used For Measuring Phases Of An Unbalanced 3phase Load
ANSWER-B
34. Ohm Is Unit Of All Of The Following Except
(A) Inductive Reactance
(B) Capacitive Reactance
(C) Resistance
(D) Capacitance
ANSWER-D
BASIC ELECTRICAL MOSTLY ASKED 125 QUESTIONS
35. The Product Of Apparent Power And Cosine Of The Phase Angle Between Circuit Voltage And Current Is
(A) True Power
(B) Reactive Power
(C) Voltamperes
(D) Instantaneous Power
ANSWER-A
36. The Product Of Apparent Power And Sine Of The Phase Angle Between Circuit Voltage And Current Is
(A) True Power
(B) Reactive Power
(C) Voltamperes
(D) Instantaneous Power
ANSWER-B
37. Which Power Of The Following Is The Product Of Voltage And Current Is
(A) True Power
(B) Reactive Power
(C) Voltamperes
(D) Instantaneous Power
ANSWER-C
38. The Power Factor Of A D.C. Circuit Is Always
(A) Less Than Unity
(B) Unity
(C) Greater Than Unity
(D) Zero
ANSWER-D
39. The Safest Value Of Current The Human Body Can Carry For More Than 3 Second Is
(A) 4 ma
(B) 9 ma
(C) 15 ma
(D) 25 ma
ANSWER-B
BASIC ELECTRICAL MOSTLY ASKED 125 QUESTIONS
40. Power Factor Of The Following Circuit Will Be Unity
(A) Inductance
(B) Capacitance
(C) Resistance
(D) Both (A) And (B)
ANSWER-C
41. Power Factor Of The Following Circuit Will Be Leading
(A) Resistance
(B) Inductance
(C) Capacitance
(D) Both (B) And (C)
ANSWER-C
42. The Units For Capacitor Is
(A) Farads
(B) Henry
(C) Ohms
(D) None
ANSWER-A
43 Formula For Coefficient Of Coupling Is
A) K=L1L2^
B) K=M/L1L2^
C)K=J M + L2
D) K=MƒL1/L2
ANSWER-B
44. The Units For Current Is
(A) Farads
(B) Henry
(C) Ohms
(D) Ampere
ANSWER-D
BASIC ELECTRICAL MOSTLY ASKED 125 QUESTIONS
45. All The Rules And Laws Of D.C. Circuit Also Apply To A.C. Circuit Containing
(A) Capacitance Only
(B) Inductance Only
(C) Resistance Only
(D) All Above
ANSWER-D
46. Power Factor Of The System Is Kept High
(A) To Reduce Line Losses
(B) To Maximise The Utilization Of The Capacities Of Generators, Lines And Transformers
(C) To Reduce Voltage Regulation Of The Line
(D) Due To All Above Reasons
(E) ANSWER-D
47. The Units For Resistance Is
(A) Farads
(B) Henry
(C) Ohms
(D) Voltage
ANSWER-C
48. Power Factor Of An Inductive Circuit Is Usually Improved By Connecting Capacitor to it in
(A) Parallel
(B) Series
(C) Either (A) Or (B)
(D) None Of The Above
49. The Range Of Power Factor Value
(A) [1 1]
(B) [-1 1]
(C) [1 0]
(D) [0 0.5]
BASIC ELECTRICAL MOSTLY ASKED 125 QUESTIONS
50. For A Sine Wave With Peak Value Imax The R.M.S. Value Is
(A) 0.5 Imax
(B) 0.707
(C) 0.9
(D) 1.414 Lmax
ANSWER-B
1. The copper loss is a loss
A)Fixed
B) Variable
C) fixed & variable
D) all of the above.
ANSWER-B
2. Core type transformer is a circuit.
A)Single
B) double
C) Single & double
D) none of these
ANSWER-B
3.In Shell type transformers the core has limbs
A)One
B) two
C) three
D) four
ANSWER-C
4. The transformer is a converting device
A)Voltage
B) current
C) frequency
D) power
ANSWER-A
BASIC ELECTRICAL MOSTLY ASKED 125 QUESTIONS
5. Which supply is used for the transformers
A)DC
B) AC & DC
C) AC
D) All of the above
ANSWER-C
6. Input to a alternator is
A)A.C
B)D.C
C) both A.C & D.C
D)NONE
ANSWER-C
7. E.M.F equation of alternator is
A)2.22f?z
B) 22.2f?z B
C) 222f?Z
D) 2.1f?z
ANSWER-A
8. Alternator working principal is
A)electromagnetic induction
B)self inductance
C) mutual inductance
D)back emf
ANSWER-A
BASIC ELECTRICAL MOSTLY ASKED 125 QUESTIONS
9. Salient pole type is also known as
A)projecting pole
B)non-projecting pole
C)cylindrical
D)non- cylindrical
ANSWER-A
10. In alternator frequency f=
A)NP/120
B)NP120
C)N/120P
D)1/NP120
11. Laminated insulations coated with varnish are normally used in the transformer
A) To reduce reluctance of magnetic path
B) To reduce the effect of eddy current
C) To reduce the hysteresis effect
D) To increase the reluctance of magnetic path
ANSWER-B
12. Transformer is a device which
A) Work through on electric induction.
B) Can step up or step down the level of voltage.
C) All of these
D) Its Working without changing the Power.
ANSWER-B
13. The transformer turns ratio determines
A) the reflected impedance
B)the ratio of primary and secondary voltages
C) the ratio of primary and secondary currents
D) All of these
ANSWER-D
BASIC ELECTRICAL MOSTLY ASKED 125 QUESTIONS
14. A transformer has
A) primary and secondary windings, both of which are considered outputs
B) primary and secondary windings, both of which are considered inputs
C) a primary winding used as an output and a secondary winding used as an input
D) a primary winding used as an input and a secondary winding used as an output
ANSWER-D
15. The rating of transformer may be expressed in
A) kW
B)KVA
C) Horse power
D) KVAR
ANSWER-B
16. An induction motor works with
A) DC only
B) AC only
C)both AC & DC
D) none.
ANSWER-C
17. The relative speed between stator and rotor fluxes is equal to
A) Synchronous speed Ns
B) Rotor speed N
C) Zero
D) Ns – N
ANSWER-C
18.The number of poles in a 3-phase induction motor is determined by
A) supply frequency
B) Motor speed
C) Both (A) & (B)
D) Supply voltage
ANSWER-C
BASIC ELECTRICAL MOSTLY ASKED 125 QUESTIONS
19. In modern alternators the rotating part is
A) Field
B) Armature
C) Both
D)None
ANSWER-A
20.The rotor preferred for a low speed hydrogenator is
A) Salient pole
B)Non salient pole
C) Both
D)None
ANSWER-A
21. Which of the following energy can be easily transformed from one form to another form of energy?
A) Electrical Energy
B)Fusion energy
C)Magnetic energy
D)Mechanical ener
ANSWER-A
22. The thickness of a 50 Hz transformer lamination is
A) 0.35 mm
B) 0.30 cm
C) 0.35 cm
D) 0.33 m
ANSWER-A
23. If a sinusoidal exciting current is applied to a transformer, the mutual flux produced is
A)Zero
B) Sinusoidal
C) Flat top
D) Negative
ANSWER-C
BASIC ELECTRICAL MOSTLY ASKED 125 QUESTIONS
21. The voltage regulation of a transformer at full-load 0.8 power factor lag is 6 per cent. Its voltage regulation at full-load 0.8 power factor lead will be
A)Zero
B) Positive
C) 54%
D) Negative
ANSWER-D
22. Transfer of electrical power from primary to secondary in a transformer takes place
A)Electrically
B)Magnetically
C)None of these
D) Electromagnetically
ANSWER-D
BASIC ELECTRICAL MOSTLY ASKED 125 QUESTIONS
