MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 42 Mcqs, each offering curated multiple-choice questions to sharpen your Electronic Mechanic knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Capacitive reactance is inversely proportional to ________. |
| A. | Voltage |
| B. | Capacitance |
| C. | Frequency |
| D. | Both capacitance and frequency |
| Answer» E. | |
| 2. |
Calculate the current in I3 in the circuit. |
| A. | -8 A |
| B. | 8 A |
| C. | 7 A |
| D. | 12 A |
| Answer» C. 7 A | |
| 3. |
A transformer has a primary to secondary turns ratio of 1:2. 50 V rms, 50 Hz sine wave is applied at primary winding. The peak secondary voltage will be |
| A. | 100 V |
| B. | 25 V |
| C. | 141.4 V |
| D. | 35.35 V |
| Answer» D. 35.35 V | |
| 4. |
A capacitor dissipates _________ energy. |
| A. | No |
| B. | 10% of the stored |
| C. | 20% of the stored |
| D. | 50% of the stored |
| Answer» B. 10% of the stored | |
| 5. |
If 100 coulomb of charge passes through a conductor in 25 s, the current in the conductor is _____ |
| A. | 1 A |
| B. | 4 A |
| C. | 10 A |
| D. | 2.5 A |
| Answer» C. 10 A | |
| 6. |
Identify the anode material in a Leclanche cell from the given options |
| A. | Ammonia |
| B. | Zinc |
| C. | Carbon |
| D. | Magnesium |
| Answer» C. Carbon | |
| 7. |
Conductivity of semiconductor _____ with temperature |
| A. | Increases |
| B. | Decreases |
| C. | Does not change |
| D. | Varies randomly |
| Answer» B. Decreases | |
| 8. |
A fuse should be connected in |
| A. | Series of neutral conductor |
| B. | Parallel of neutral conductor |
| C. | Series of live conductor |
| D. | Parallel of live conductor |
| Answer» D. Parallel of live conductor | |
| 9. |
On what principle do fuses work? |
| A. | Heating effect of resistance |
| B. | Heating effect of voltage |
| C. | Heating effect of electrodes |
| D. | Heating effect of current |
| Answer» E. | |
| 10. |
In actual practice, the rating of transformer is specified in: |
| A. | kW |
| B. | kVA |
| C. | kVAR |
| D. | kA |
| Answer» C. kVAR | |
| 11. |
In a 3-phase system, there phase voltages are displaced by an angle of…. |
| A. | 90° |
| B. | 120° |
| C. | 180° |
| D. | 270° |
| Answer» C. 180° | |
| 12. |
Directions: It consists of two statements one labeled as statement I and the other as statement II. Examine these two statements carefully and select the correct answer using the code given below.Statement I: If a squirrel cage motor is started at full rated voltage, the power supply could be damaged.Statement II: For squirrel cage induction motors, starting current is high and power factor at starting is low. |
| A. | Both statements I and statement II are individually true and statement II is the correct explanation of statement I |
| B. | Both statement I and statement II are individually true but statement II is not the correct explanation of statement I |
| C. | Statements I is true but statement II is false |
| D. | Statement I is false but statement II is true |
| Answer» E. | |
| 13. |
If 1 micro ampere current is flowing through a conductor, then the number of electrons flowing through in one second are |
| A. | 6.28 × 1022 |
| B. | 6.28 × 1015 |
| C. | 6.28 × 1019 |
| D. | 6.28 × 1012 |
| Answer» E. | |
| 14. |
If 12 V are applied to a circuit that consumes 78 Watt, what is the current flow through circuit |
| A. | 6.5 A |
| B. | 0.65 A |
| C. | 65 mA |
| D. | 12 A |
| Answer» B. 0.65 A | |
| 15. |
Maximum power is transferred when |
| A. | Load Impedance > Source Impedance |
| B. | Load Impedance < Source Impedance |
| C. | Load Impedance = Source Impedance |
| D. | Load Impedance = 0 |
| Answer» D. Load Impedance = 0 | |
| 16. |
Cables that transmits signals in form of light is |
| A. | Unwired |
| B. | Fiber optic cable |
| C. | Coaxial cable |
| D. | Twisted pair cable |
| Answer» C. Coaxial cable | |
| 17. |
In AC circuits, laminated iron is invariably used in order to |
| A. | Reduce eddy current loss |
| B. | Increase heat radiation |
| C. | Make assembly cheap and easier |
| D. | Reduce circuit permeability |
| Answer» B. Increase heat radiation | |
| 18. |
A resistor used in color TV has the following color bands (in this order): yellow, violet, orange and silver. Its nominal value is |
| A. | 4.7 kΩ ± 10% |
| B. | 4.7 kΩ ± 5% |
| C. | 47 kΩ ± 10% |
| D. | 470 kΩ ± 5% |
| Answer» D. 470 kΩ ± 5% | |
| 19. |
Hysteresis loss in a transformer is caused by |
| A. | Induced voltage in the core due to changing magnetic field |
| B. | Variation in input frequency |
| C. | Energy consumed in reversing the magnetism of iron core |
| D. | Fluctuation in load current |
| Answer» D. Fluctuation in load current | |
| 20. |
Identify the port shown in the image below. |
| A. | HDMI |
| B. | DVI |
| C. | MIDI |
| D. | FireWire |
| Answer» B. DVI | |
| 21. |
Name the connector shown in the picture. |
| A. | XLR connector female |
| B. | BNC connector |
| C. | TRS plus female |
| D. | RCA plug |
| Answer» B. BNC connector | |
| 22. |
In which one of the following is flexible wire is not used? |
| A. | T.V |
| B. | Table fan |
| C. | Table light |
| D. | Cement factory |
| Answer» E. | |
| 23. |
If the capacity of a battery is 4000mAh, it can supply 4 Ampere current for |
| A. | 120 min |
| B. | 240 min |
| C. | 60 min |
| D. | 30 min |
| Answer» D. 30 min | |
| 24. |
An air capacitor has its plates separated by a 0.1 cm distance. The total area of the plates is 10 cm2. Identify the value of capacitor from the options given below. |
| A. | 8.85 pF |
| B. | 10 pF |
| C. | 88.5 pF |
| D. | 100 pF |
| Answer» B. 10 pF | |
| 25. |
HRC is a type of: |
| A. | Fuse |
| B. | Switch |
| C. | Circuit breaker |
| D. | Connector |
| Answer» B. Switch | |
| 26. |
Five cells, each with an e.m.f. of 2V and internal resistance of 0.5 Ω are connected in series. The resulting battery will have |
| A. | An e.m.f. of 2V and an internal resistance of 0.5 Ω |
| B. | An e.m.f. of 10V and an internal resistance of 2.5 Ω |
| C. | An e.m.f. of 2V and an internal resistance of 0.1 Ω |
| D. | An e.m.f. of 10V and an internal resistance of 0.1 Ω |
| Answer» C. An e.m.f. of 2V and an internal resistance of 0.1 Ω | |
| 27. |
A conductor of 100 m length with 1 mm diameter has a resistance of 900 mΩ. What will be the resistance of another conductor of same material with same length and 3 mm diameter? |
| A. | 300 mΩ |
| B. | 100 mΩ |
| C. | 2700 mΩ |
| D. | None of the above |
| Answer» C. 2700 mΩ | |
| 28. |
If the frequency of a radio wave is increased, then its wave length will |
| A. | Increase |
| B. | Decrease |
| C. | Remains the same |
| D. | Cannot tell |
| Answer» C. Remains the same | |
| 29. |
Loading of a cable is done to1. Increase its inductance2. Increase its leakage resistance3. Decrease its leakage resistance4. Achieve distortion less condition |
| A. | 1, 3 & 4 |
| B. | 1 & 3 only |
| C. | 2 & 4 only |
| D. | 1 & 4 only |
| Answer» D. 1 & 4 only | |
| 30. |
5 resistors of 10 Ω are connected in parallel. A current of 1 A flows through each of them. What will be the current through each of them if they are connected in series? |
| A. | 0.2 A |
| B. | 5 A |
| C. | 0.5 A |
| D. | 1 A |
| Answer» B. 5 A | |
| 31. |
A transformer with input 60 W power at the primary has an efficiency of 95%. Identify its power at the secondary from the given options. |
| A. | 45 W |
| B. | 95 W |
| C. | 100 W |
| D. | 57 W |
| Answer» E. | |
| 32. |
Find Current, if Resistance = 50 ohms and Power = 100 Watts |
| A. | 2 A |
| B. | 1.414 A |
| C. | 3 A |
| D. | 1.314 A |
| Answer» C. 3 A | |
| 33. |
In a particular circuit connection, AWG 18 wire is selected over AWG 22. The reason is that it is having |
| A. | Lesser weight |
| B. | Less thickness |
| C. | Higher resistance |
| D. | Higher current carrying capacity |
| Answer» E. | |
| 34. |
Find the voltage across 24 Ω resistor. |
| A. | 8 V |
| B. | 9 V |
| C. | 1 V |
| D. | 6 V |
| Answer» B. 9 V | |
| 35. |
Percentage voltage regulation = __________ × 100; (Where VNL = No Load Voltage, VFL = Full Load Voltage) |
| A. | (VNL - VFL) / VFL |
| B. | (VNL - VFL) / VNL |
| C. | VFL / VNL |
| D. | VNL / VFL |
| Answer» B. (VNL - VFL) / VNL | |
| 36. |
In a Transformer, if the secondary voltage is greater than primary voltage, then what type of transformer is this? |
| A. | Transformer on DC Supply |
| B. | Step Down Transformer |
| C. | Ideal Transformer |
| D. | Step Up Transformer |
| Answer» E. | |
| 37. |
If 120 Coulomb of charge passes through a conductor in 60 sec, the current in the conductor is |
| A. | 0.5 A |
| B. | 2 A |
| C. | 3.33 mA |
| D. | 0.3 mA |
| Answer» C. 3.33 mA | |
| 38. |
Following transmission media are given:(a) Twisted pair cables(b) Optical fiber cables(c) Coaxial cables(d) MicrowavesFor high rate data transmission systems, arrange the above in terms of their Losses in ascending orders.The correct sequence is given by: |
| A. | (b), (c), (a), (d) |
| B. | (d), (c), (a), (b) |
| C. | (a), (b), (c), (d) |
| D. | (b), (d), (c), (a) |
| Answer» E. | |
| 39. |
If Vp is peak voltage of a sine wave then RMS voltage will be |
| A. | Vp/2 |
| B. | \(\frac{{{V_p}}}{{\sqrt 2 }}\) |
| C. | \(\frac{{V_p^2}}{2}\) |
| D. | Vp/4 |
| Answer» C. \(\frac{{V_p^2}}{2}\) | |
| 40. |
Identify the circuit. |
| A. | High pass filter |
| B. | Bandpass filter |
| C. | Low pass filter |
| D. | Band reject filter |
| Answer» D. Band reject filter | |
| 41. |
Find the current through 3-ohm resistor |
| A. | 6 A |
| B. | 2 A |
| C. | 2.67 A |
| D. | 3 A |
| Answer» C. 2.67 A | |
| 42. |
Boost charge is given to a |
| A. | Dead battery |
| B. | The battery in danger of becoming over-discharged during a working shift |
| C. | Fully charged battery |
| D. | Completely discharged battery |
| Answer» E. | |