InterviewSolution
Saved Bookmarks
InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
When maximum power transfer takes place, the efficiency of power transfer of the circuit is (A) 100% (B) 75% (C) 50% (D) 25% |
|
Answer» The Correct option is (C) 50% |
|
| 2. |
An ideal voltage source should have: (A) Zero source resistance (B) Infinite source resistance (C) Terminal voltage is proportional to current (D) Open-circuit voltage nearly equal to voltage of the load current |
|
Answer» (A) Zero source resistance |
|
| 3. |
The superposition theorem requires as many circuits to be solved as there are: (A) Nodes (B) Sources (C) Nodes and Sources (D) Nodes, Sources and Mesh |
|
Answer» The superposition theorem requires as many circuits to be solved as there are Sources. |
|
| 4. |
A wire of resistance R has it length and cross-section both doubled. Its resistance will become (A) 4 R (B) 2 R (C) R (D) R / 4. |
|
Answer» The Correct option is (C) R |
|
| 5. |
Which of the following is not the same as watt?(A) joule/sec (B) amperes/volt (C) amperes x volts (D) ( amperes )2 x ohm. |
|
Answer» (B) amperes/volt |
|
| 6. |
Ohm's law is not applicable to(A) DC circuits (B) high currents (C) small resistors (D) semi-conductors. |
|
Answer» (D) semi-conductors |
|
| 7. |
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) Can step up or step down the level of voltage. |
|
| 8. |
In alternator frequency f= (A) NP/120 (B) NP120 (C) N/120P (D) 1/NP120 |
|
Answer» In alternator frequency f= NP/120. |
|
| 9. |
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) Electromagnetically |
|
| 10. |
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» If a sinusoidal exciting current is applied to a transformer, the mutual flux produced is Flat top. |
|
| 11. |
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» The thickness of a 50 Hz transformer lamination is 0.35 mm. |
|
| 12. |
The rating of transformer may be expressed in (A) kW (B) KVA (C) Horse power (D) KVAR |
|
Answer» The rating of transformer may be expressed in KVA. |
|
| 13. |
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) Negative |
|
| 14. |
Which of the following is not a unit of conductance?(A) mho (B) Siemens (C) Volt/ampere (D) Ampere/volt |
|
Answer» (C) Volt/ampere |
|
| 15. |
Three capacitors, each of C microfarad are first connected in series and then in parallel. The equivalent capacitance(A) Is greater in the series combination (B) Is greater in the parallel combination (C) Is the same in the two combination (D) None of these |
|
Answer» (B) Is greater in the parallel combination |
|
| 16. |
Faradays- second law the induced EMF is (a) Dynamically Induced EMF (b) Statically Induced EMF (c) Eddy EMF (d) None of these |
|
Answer» (b) Statically Induced EMF |
|
| 17. |
For maximum transfer of power, internal resistance of the source should be: (A) Equal to load resistance (B) Less than that of the load (C) More than that of the load (D) Zero |
|
Answer» (A) Equal to load resistance |
|
| 18. |
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 energy |
|
Answer» (A) Electrical Energy |
|
| 19. |
The rating of fuse wire is expressed in terms of (A) Ohms (B) Mhos (C) Amperes (D) Watts. |
|
Answer» The rating of fuse wire is expressed in terms of Amperes. |
|
| 20. |
Which of the elements in the following is not bilateral? (A) Resistor (B) Inductor (C) Capacitor (D) Transistor |
|
Answer» (D) Transistor |
|
| 21. |
Resistivity of a wire depends on (A) length (B) material (C) cross section area (D) All of the above. |
|
Answer» Resistivity of a wire depends on material. |
|
| 22. |
In Series Connection of elements _______Parameter is Same (a) Current (b)Voltage (c) Power (d) None of these |
|
Answer» In Series Connection of elements Current Parameter is Same. |
|
| 23. |
What will be the resistance if 10 resistors of 10 ohm each is connected in series (A)100 Ω (B)1 Ω (C) 0.1 Ω (D)10 Ω. |
|
Answer» The Correct option is (A)100 Ω |
|
| 24. |
The rotor preferred for a low speed hydrogenerator is _______(A) Salient pole (B)Non salient pole (C) Both (D)None |
|
Answer» The rotor preferred for a low speed hydrogenerator is Salient pole. |
|
| 25. |
In parallel Connection of elements ________ Parameter is Same (a) Current (b) Voltage (c) Power (d) None of these |
|
Answer» In parallel Connection of elements Current Parameter is Same. |
|
| 26. |
The self inductance is written as follows (a) L=NØ/I (b) L=Ø/I (c) L=V/dI/dt (d) All |
|
Answer» The Correct option is (d) All |
|
| 27. |
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)Receives energy |
|
| 28. |
Ohm is Unit Of All Of The Following Except (A) Inductive Reactance(B) Capacitive Reactance (C) Resistance (D) Capacitance |
|
Answer» (D) Capacitance |
|
| 29. |
In modern alternators the rotating part is _______(A) Field (B) Armature (C) Both (D)None |
|
Answer» In modern alternators the rotating part is Field . |
|
| 30. |
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» The relative speed between stator and rotor fluxes is equal to Zero. |
|
| 31. |
Unit of electric potential(A) Ampere (B) Volts (C) coulomb (D) Volt-ampere |
|
Answer» Unit of electric potential Volts. |
|
| 32. |
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) Reactive Power |
|
| 33. |
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 voltagea |
|
Answer» (C) Both (A) & (B) |
|
| 34. |
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) True Power |
|
| 35. |
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» 600 cycles cycles does a sine wave go through in 10s when its frequency is 60HZ. |
|
| 36. |
If E1 = Asinωt and E2 = Asin(ωt - θ), then (A) E1& E2 are in phase (B) E2 lags E1 by θ (C) E1 lags E2 by θ (D) E2 lags E1 by 90° |
|
Answer» (B) E2 lags E1 by θ |
|
| 37. |
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) Resistance Only |
|
| 38. |
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) a primary winding used as an input and a secondary winding used as an output |
|
| 39. |
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» The Correct option is (B) 6 Kvar |
|
| 40. |
Power Factor Of An Electrical Circuit is Equal To (A) R/Z(B) Cosine Of Phase Angle Difference Betweencurrent And Voltage (C) Kw/Kva(D) Ratio Of Useful Current To Total Currrent iw/I (E) All Above |
|
Answer» (E) All Above |
|
| 41. |
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)r.m.s. value to average value |
|
| 42. |
Alternator working principal is (A) electromagnetic induction (B) self inductance (C) mutual inductance (D) back emf |
|
Answer» (A)electromagnetic induction |
|
| 43. |
E.M.F equation of alternator is (A) 2.22fɸz (B) 22.2fɸz B (C) 222fɸZ (D) 2.1fɸz |
|
Answer» The Correct option is (A) 2.22fɸz |
|
| 44. |
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) Magnitude & direction of the quantity |
|
| 45. |
The copper loss is a ______ loss (A) Fixed (B) Variable (C) fixed & variable (D) all of the above. |
|
Answer» The copper loss is a Variable loss. |
|
| 46. |
50HZ Means (A) 1 cycle/sec (B) 2 Cycles/sec (C) 50 Cycles/sec (D) 50 Cycles/min |
|
Answer» (C) 50 Cycles/sec |
|
| 47. |
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» The Correct option is (B) 9 ma |
|
| 48. |
The transformer is a ______ converting device (A) Voltage (B) current (C) frequency (D) power |
|
Answer» The transformer is a Voltage converting device. |
|
| 49. |
Input to a alternator is (A)A.C (B)D.C (C) both A.C &D.C (D) NONE |
|
Answer» (C) both A.C &D.C |
|
| 50. |
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) Peak Value To R.M.S. Value |
|