MCQOPTIONS
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MCQOPTIONS
This section includes 57 Mcqs, each offering curated multiple-choice questions to sharpen your Instrumentation Transducers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Find current supplied by the source. |
| A. | 28.45 A |
| B. | 18 A |
| C. | 22 A |
| D. | 23.5 A |
| Answer» B. 18 A | |
| 2. |
If the resistance and impedance of the circuit is 10 ohms each, then its power factor is ________. |
| A. | zero |
| B. | unity |
| C. | leading |
| D. | lagging |
| Answer» C. leading | |
| 3. |
A network contains linear resistors and ideal voltage sources. If the values of all the resistors are doubled, then the voltage across each resistor is |
| A. | Halved |
| B. | Doubled |
| C. | Increased by four times |
| D. | Not changed |
| Answer» E. | |
| 4. |
If apparent power is found equal to active power, then the system power factor is: |
| A. | 1 |
| B. | 0.9 |
| C. | 0.8 |
| D. | 1.2 |
| Answer» B. 0.9 | |
| 5. |
If voltage is measured across an AC mains open switch, the meter will read: |
| A. | 230 V |
| B. | 0 V |
| C. | 110 V |
| D. | 10 V |
| Answer» D. 10 V | |
| 6. |
In which of the following connections do we have common neutral point? |
| A. | Sigma |
| B. | Delta |
| C. | Omega |
| D. | Star |
| Answer» E. | |
| 7. |
In a series lamp circuit, each bulb is rated for 2 V. Calculate the number of bulbs to be connected in series to run on a 110 V AC line. |
| A. | 60 |
| B. | 55 |
| C. | 65 |
| D. | 70 |
| Answer» C. 65 | |
| 8. |
Ohm's law can be applied to |
| A. | Resistor |
| B. | Rectifier |
| C. | Transformer |
| D. | Zener Diode |
| Answer» B. Rectifier | |
| 9. |
If the potential difference across the ends of a conductor is halved, what happens to the current flowing through it? |
| A. | It gets increased |
| B. | It gets doubled |
| C. | It gets decreased |
| D. | It gets halved |
| Answer» E. | |
| 10. |
In a series RLC circuit the impedance is ________ and current is ________ at resonance. |
| A. | Minimum, maximum |
| B. | Zero, zero |
| C. | Infinite, zero |
| D. | Zero, infinite |
| Answer» B. Zero, zero | |
| 11. |
A network contains linear resistors and ideal voltage sources. If values of all the resistors are doubled, then voltage across each resistor is |
| A. | Halved |
| B. | Doubled |
| C. | Increases by 4 times |
| D. | Remains the same |
| Answer» E. | |
| 12. |
A 10 ohm resistor is connected across a 100 V DC source. The value of current flowing through the circuit is |
| A. | 10 A |
| B. | 100 A |
| C. | 1 A |
| D. | 110 A |
| Answer» B. 100 A | |
| 13. |
A current of 10 A flows through a resistance of 10 Ω. The power dissipated is: |
| A. | 100 W |
| B. | 1000 W |
| C. | 10 W |
| D. | 10000 W |
| Answer» C. 10 W | |
| 14. |
A coil is connected across a 100V, 50 Hz supply. If the impedance of the circuit is 10 ohms, the current flowing through the circuit is _______. |
| A. | 1000 A |
| B. | 10 A |
| C. | 1 A |
| D. | 100 A |
| Answer» C. 1 A | |
| 15. |
A battery is connected to a resistance of 20 Ω. If a current of 0.75 A has to be produced, what should be the EMF of the battery? |
| A. | 20 V |
| B. | 15 V |
| C. | 5 V |
| D. | 30 V |
| Answer» C. 5 V | |
| 16. |
If the diameter of a wire is doubled keeping the length constant, the resistance _______ |
| A. | becomes one fourth |
| B. | become twice |
| C. | remains same |
| D. | becomes 4 times |
| Answer» B. become twice | |
| 17. |
Capacitive reactance of a capacitor is |
| A. | \(\frac{1}{{2\pi fC}}\) |
| B. | \(\frac{{Cf}}{{2\pi }}\) |
| C. | \(\frac{{2\pi}}{{fC }}\) |
| D. | \(\frac{1}{{2\pi \sqrt {fC} }}\) |
| Answer» B. \(\frac{{Cf}}{{2\pi }}\) | |
| 18. |
In Indian households, the single phase supply voltage is in the form of: |
| A. | Peak-to-Peak voltage |
| B. | DC voltage |
| C. | Pulsed voltage |
| D. | RMS voltage |
| Answer» E. | |
| 19. |
If the value of phase voltage in a star connected circuit is 240 V, then its line voltage is ______. |
| A. | 415 V |
| B. | 400 V |
| C. | 120 V |
| D. | 440 V |
| Answer» B. 400 V | |
| 20. |
A choke has characteristics of______ |
| A. | High inductive, high resistance |
| B. | Low indicative, low resistance |
| C. | Low indicative, high resistance |
| D. | High indicative, low resistance |
| Answer» E. | |
| 21. |
Neutralizing capacitors are normally used in |
| A. | Audio amplifiers |
| B. | Video amplifiers |
| C. | RF and IF amplifiers |
| D. | Operational amplifiers |
| Answer» D. Operational amplifiers | |
| 22. |
Non-polar electrolytic capacitors |
| A. | are used for applications in AC circuits without any DC polarizing voltage |
| B. | contain two capacitors connected in series with opposing polarities |
| C. | Both (a) and (b) are correct |
| D. | Both (a) and (b) are wrong |
| Answer» B. contain two capacitors connected in series with opposing polarities | |
| 23. |
Ohms law states that: |
| A. | R = I × V |
| B. | V = R/I |
| C. | I = V/R |
| D. | I = V × R |
| Answer» D. I = V × R | |
| 24. |
Find the electricity bill for a month (assume 30 days) with the given data.(i) Six lamps of 40 W each, working for 4 hours per day(ii) Two tube lights 125 W each, working for 2 hours per day(iii) One 1 kW heater working for 3 hours per day.Each unit of energy costs Rs. 5. |
| A. | Rs. 36 |
| B. | Rs. 330 |
| C. | Rs. 669 |
| D. | Rs. 421 |
| Answer» D. Rs. 421 | |
| 25. |
Following four resistances are connected in parallel; the largest power is dissipated by…1) 2.4Ω, 1W2) 5.1Ω, 2W3) 10Ω, 5W4) 22Ω, 10W |
| A. | 2.4Ω, 1W |
| B. | 5.1Ω, 2W |
| C. | 10Ω, 5W |
| D. | 22Ω, 10W |
| Answer» B. 5.1Ω, 2W | |
| 26. |
A capacitor is charged by a constant current of 1 mA and results in a voltage increase of 10 V in a 5 sec interval. The value of capacitance is |
| A. | 0.50 mF |
| B. | 1.33 mF |
| C. | 2 μF |
| D. | 2 mF |
| Answer» B. 1.33 mF | |
| 27. |
Kirchhoff's law are valid for_____ |
| A. | Linear circuit |
| B. | Non - linear circuit |
| C. | Both linear and nonlinear circuit |
| D. | Only passive circuit |
| Answer» D. Only passive circuit | |
| 28. |
In a series combination of resistances: |
| A. | The voltage remains same |
| B. | The current and voltage remain same |
| C. | The current and voltage both vary |
| D. | The current remains same |
| Answer» E. | |
| 29. |
Direction: Question consists of two statements, one labeled as the 'Assertion (A)' and the other as 'Reason (R)'. Examine these two statements carefully and select the answer to this question using the codes given below:Assertion (A): Capacitance between two parallel plates of area 'A' each and distance of separation 'd' is εA/d for a large A/d ratio.Reason (R): Fringing electric field can be neglected for a large A/d ratio. |
| A. | Both A and R are individually true and R is the correct explanation of A |
| B. | Both A and R are individually true but R is not the correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true |
| Answer» B. Both A and R are individually true but R is not the correct explanation of A | |
| 30. |
Direction: Question consists of two statements, one labeled as the 'Assertion (A)' and the other as 'Reason (R)'. Examine these two statements carefully and select the answer to this question using the codes given below:Assertion (A): When five percent of silver is added to copper to form an alloy, the electrical resistivity of the alloy is more than that of pure copper.Reason (R): Silver has a higher value of resistivity than that of copper. |
| A. | Both A and R are individually true and R is the correct explanation of A |
| B. | Both A and R are individually true but R is not the correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true |
| Answer» D. A is false but R is true | |
| 31. |
A sinusoidal alternating voltage of 50 Hz has an RMS value of 200 V. Find the maximum value and wavelength. |
| A. | 272.2 V, 300 rad/sec |
| B. | 280.2 V, 308 rad/sec |
| C. | 282.2 V, 314 rad/sec |
| D. | 277.4 V, 302 rad/sec |
| Answer» D. 277.4 V, 302 rad/sec | |
| 32. |
In a pure inductor the voltage waverform “leads” the current by |
| A. | 180° |
| B. | 120° |
| C. | 90° |
| D. | 60° |
| Answer» D. 60° | |
| 33. |
Kirchhoff’s laws are valid for |
| A. | linear circuits only |
| B. | passive time invariant circuits |
| C. | non – linear circuits only |
| D. | both linear and non – linear circuits |
| Answer» E. | |
| 34. |
At what temperature and atmosphere, would a carbon composition resistor rod required to be sintered during its preparation? |
| A. | 2500 degree Celsius in Hydrogen |
| B. | 1400 degree Celsius in Hydrogen |
| C. | 1400 degree Fahrenheit in Neon |
| D. | 2500 degree Fahrenheit in Neon |
| Answer» B. 1400 degree Celsius in Hydrogen | |
| 35. |
HP is equivalent to how many watts? |
| A. | 743 |
| B. | 746 |
| C. | 745 |
| D. | 744 |
| Answer» C. 745 | |
| 36. |
Ohm’s law is applicable to |
| A. | semi – conductors |
| B. | vacuum tubes |
| C. | electrolytes |
| D. | none of these |
| Answer» E. | |
| 37. |
2 ohm resistance having current of 2A will dissipate the power of____ |
| A. | 8 W |
| B. | 8 J |
| C. | 2 W |
| D. | 4 W |
| Answer» B. 8 J | |
| 38. |
Line voltage in delta connection is equal to________. |
| A. | Phase voltage |
| B. | √3 Phase voltage |
| C. | 1/3 Phase voltage |
| D. | 3 Phase voltage |
| Answer» B. √3 Phase voltage | |
| 39. |
For a system with 230 V AC, 5 A current and lag of 30°, what's the reactive power? |
| A. | 275 VAR |
| B. | 675 VAR |
| C. | 175 VAR |
| D. | 575 VAR |
| Answer» E. | |
| 40. |
A Capacitor function _____ |
| A. | stops AC and passes DC |
| B. | stops DC and passes AC |
| C. | passes both, AC and DC |
| D. | stops both, AC and DC |
| Answer» C. passes both, AC and DC | |
| 41. |
Capacitance is not affected by ________ |
| A. | Plate area |
| B. | Distance between plates |
| C. | Dielectric material |
| D. | Frequency |
| Answer» E. | |
| 42. |
Four, 100 W bulbs are connected in parallel across 200 V supply line, If one bulb gets fused |
| A. | no bulb will light |
| B. | all the four bulbs will light |
| C. | rest of the three bulbs will light |
| D. | none of the above |
| Answer» D. none of the above | |
| 43. |
A 100 Ah capacity battery should deliver a current of 10 A for approximately _____ hrs. |
| A. | 12 |
| B. | 10 |
| C. | 100 |
| D. | 25 |
| Answer» C. 100 | |
| 44. |
A sine wave has a frequency of 50 Hz. Its angular frequency is |
| A. | \(\frac{{50}}{\pi }\) radians/sec |
| B. | 50 π radians/sec |
| C. | 100 π radians/sec |
| D. | \(\frac{{100}}{\pi }\) radians/sec |
| Answer» D. \(\frac{{100}}{\pi }\) radians/sec | |
| 45. |
A gang capacitor has ______ varied by changing _______ respectively. |
| A. | One capacitance, Dielectric |
| B. | Two capacitances, Plate area |
| C. | one capacitance, No of plates |
| D. | Two capacitances, Distance between plates |
| Answer» C. one capacitance, No of plates | |
| 46. |
A given copper wire of 10 Ω resistance is stretched to double its original length, Its new resistance is |
| A. | 10 Ω |
| B. | 20 Ω |
| C. | 30 Ω |
| D. | 40 Ω |
| Answer» E. | |
| 47. |
Identify the circuit in the given figure: |
| A. | Voltage controlled current source |
| B. | Voltage controlled voltage source |
| C. | Current controlled voltage source |
| D. | Current controlled current source |
| Answer» E. | |
| 48. |
HOW_WE_CAN_EXPRESS_LAPLACE_TRANSFORM_OF_COMPONENT_CAPACITOR??$ |
| A. | Cs |
| B. | C |
| C. | 1/sC |
| D. | 1/C |
| Answer» D. 1/C | |
| 49. |
What_is_the_natural_frequency_of_RLC_circuit?$ |
| A. | LC |
| B. | RLC |
| C. | ‚àöLC |
| D. | 1/(‚àöLC) |
| Answer» E. | |
| 50. |
What is the Laplace transform of component inductor? |
| A. | sL |
| B. | L |
| C. | L/s |
| D. | s<sup>2</sup>L |
| Answer» B. L | |