MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 503 Mcqs, each offering curated multiple-choice questions to sharpen your ENGINEERING SERVICES EXAMINATION (ESE) knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Assertion (A): Schering bridge is a low voltage bridge.Reason (R): Schering bridge is very commonly used for measurement of capacitance. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true R is false |
| D. | A is false R is true |
| Answer» E. | |
| 2. |
A universal RLC bridge uses |
| A. | Maxwell bridge for measurement of inductance and De Sauty's bridge for measurement of capacitance |
| B. | Maxwell's bridge for measurement of inductance and modified De Sauty bridge for measurement of capacitance |
| C. | Maxwell Wien bridge for measurement of inductance and modified De Sauty bridge for measurement of inductance |
| D. | Maxwell Wien bridge for measurement of inductance and Wien bridge for measurement of capacitance |
| Answer» D. Maxwell Wien bridge for measurement of inductance and Wien bridge for measurement of capacitance | |
| 3. |
A moving coil instrument has a resistance of 0.5 Ω and a full scale deflection of 0.1 A. To convert it into an ammeter of 0-10 A the shunt resistance should be |
| A. | 0.004 Ω |
| B. | 0.005 Ω |
| C. | 0.05 Ω |
| D. | 0.1 Ω |
| Answer» C. 0.05 Ω | |
| 4. |
A single phase energy meter operates on induction principle. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 5. |
An ohmmeter is a |
| A. | moving coil instrument |
| B. | moving iron instrument |
| C. | dynamometer instrument |
| D. | induction instrument |
| Answer» B. moving iron instrument | |
| 6. |
In a phase shifting transformer the currents in the two stator winding are in phase. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» C. May be True or False | |
| 7. |
Assertion (A): Megger is used to check insulation resistance of cables. Reason (R): Insulation resistance of cables is very high. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true R is false |
| D. | A is false R is true |
| Answer» B. Both A and R are true but R is not correct explanation of A | |
| 8. |
The scale of hot wire ammeter is |
| A. | linear |
| B. | non-linear |
| C. | cramped |
| D. | absolute linear |
| Answer» C. cramped | |
| 9. |
In air friction damping |
| A. | the air pressure opposes the motion of piston when it is moving inwards |
| B. | the air pressure opposes the motion of piston when it is moving outwards |
| C. | the air pressure opposes the motion of piston both when it is moving inwards as well as outwards |
| D. | the air pressure may oppose or aid the motion of piston depending on the design |
| Answer» D. the air pressure may oppose or aid the motion of piston depending on the design | |
| 10. |
Wagner earthing device is used to eliminate error due to |
| A. | electromagnetic coupling |
| B. | electrostatic coupling |
| C. | both electrostatic and electromagnetic coupling |
| D. | either (a) or (b) |
| Answer» C. both electrostatic and electromagnetic coupling | |
| 11. |
Assertion (A): Strain measurement using strain gauge invariably requires a dummy strain gauge.Reason (R): The resistance of strain gauge depends on temperature. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true R is false |
| D. | A is false R is true |
| Answer» B. Both A and R are true but R is not correct explanation of A | |
| 12. |
Assertion (A): Hall effect is observed in all metals but is very appreciable in semiconductors.Reason (R): Hall effect transducer is very suitable for measurement of magnetic flux density. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true R is false |
| D. | A is false R is true |
| Answer» C. A is true R is false | |
| 13. |
An ammeter has a resistance of 50 ohms and a shunt of 0.01 Ω. The deflection is θ. If the shunt resistance is increased to 0.02 Ω, the deflection will be. |
| A. | θ |
| B. | 2θ |
| C. | 0.5θ |
| D. | 0.25θ |
| Answer» C. 0.5θ | |
| 14. |
Assertion (A): In a CRT, grid is kept at negative potential with respect to cathode.Reason (R): The function of grid in an electronic tube is to control the number of electrons. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true R is false |
| D. | A is false R is true |
| Answer» B. Both A and R are true but R is not correct explanation of A | |
| 15. |
The coding system generally used in digital telemetry is |
| A. | PPM (Pulse position modulation) |
| B. | PAM (Pulse amplitude modulation) |
| C. | PCM (Pulse code modulation) |
| D. | PDM (Pulse duration modulation) |
| Answer» D. PDM (Pulse duration modulation) | |
| 16. |
Three phase four wire induction energy meter is used to measure |
| A. | energy in 3 phase balanced star load |
| B. | energy in 3 phase balanced delta load |
| C. | energy in 3 phase unbalanced load |
| D. | either (a) or (b) |
| Answer» D. either (a) or (b) | |
| 17. |
To measure an unknown ac voltage by an ac potentiometer it is desirable that supply for the potentiometer is taken |
| A. | from a battery |
| B. | from a source which is not the same as unknown voltage |
| C. | from the same source as the unknown voltage |
| D. | either (a) or (b) |
| Answer» D. either (a) or (b) | |
| 18. |
The increase in intensity of trace in a CRO causes a change in |
| A. | beam current |
| B. | frequency of time base |
| C. | gain of Y amplifier |
| D. | accelerating voltage |
| Answer» B. frequency of time base | |
| 19. |
A land line telemetry system is suitable for distance upto |
| A. | about 1 km only |
| B. | about 10 km only |
| C. | about 100 km only |
| D. | any of the above |
| Answer» B. about 10 km only | |
| 20. |
An induction wattmeter can be used for |
| A. | dc only |
| B. | 50 Hz ac only |
| C. | both ac and dc |
| D. | high frequency ac only |
| Answer» C. both ac and dc | |
| 21. |
A moving iron voltmeter reads 250 V when connected to 250 V dc. If connected to 250 V 50 Hz, the voltmeter reading is likely to be |
| A. | 250 V |
| B. | 252 V |
| C. | 248 V |
| D. | 210 V |
| Answer» D. 210 V | |
| 22. |
The device having highest photo sensitivity is |
| A. | photoconductive cell |
| B. | photovoltaic cell |
| C. | photodiode |
| D. | phototransistor |
| Answer» B. photovoltaic cell | |
| 23. |
A moving coil meter has a shunt of 0.02 Ω resistance. If coil resistance is 1000 Ω and a potential difference of 500 mV is required across it to cause full scale deflection, the current through shunt is |
| A. | 2.5 A |
| B. | 25 A |
| C. | 0.25 A |
| D. | 0.025 A |
| Answer» C. 0.25 A | |
| 24. |
Pirani gauge is used to measure |
| A. | very low pressure |
| B. | high pressure |
| C. | pressure in the range of 1 atmosphere |
| D. | fluid flow |
| Answer» B. high pressure | |
| 25. |
The method of frequency compensation in moving iron voltmeter is |
| A. | to use a capacitor in series with coil |
| B. | to connect a capacitor in parallel with coil |
| C. | to connect a capacitor in parallel with series resistance |
| D. | none of the above |
| Answer» D. none of the above | |
| 26. |
Two ammeters A and B are connected in parallel in a circuit carrying 100 A. Their resistances are 0.8 mΩ. Their readings will be. |
| A. | 55.56 and 44.44 A respectively |
| B. | 44.44 A and 55.56 A respectively |
| C. | 60 A and 40 A respectively |
| D. | 40 A and 60 A respectively |
| Answer» B. 44.44 A and 55.56 A respectively | |
| 27. |
Assertion (A): Damping in a vibration galvanometer is small.Reason (R): Vibration galvanometer is a PMMC instrument. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true R is false |
| D. | A is false R is true |
| Answer» C. A is true R is false | |
| 28. |
The stator of phase shifting transformer for use in conjunction with an ac potentiometer has a |
| A. | single phase winding |
| B. | two phase winding |
| C. | 3 phase winding |
| D. | either (a) or (c) |
| Answer» C. 3 phase winding | |
| 29. |
Assertion (A): An electrostatic voltmeter is free from hysteresis and eddy current errors.Reason (R): An electrostatic voltmeter has a number of fixed and moving vanes in parallel. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true R is false |
| D. | A is false R is true |
| Answer» C. A is true R is false | |
| 30. |
An electrostatic voltmeter is suitable for |
| A. | low voltage at high frequency |
| B. | high voltage |
| C. | low voltage at low frequency |
| D. | all ac and dc voltages |
| Answer» C. low voltage at low frequency | |
| 31. |
It is required to study transients during switching process. Which CRO should be preferred? |
| A. | Ordinary CRO |
| B. | Dual beam CRO |
| C. | Dual trace CRO |
| D. | Storage oscilloscope |
| Answer» E. | |
| 32. |
In a hot wire instrument, the deflection is proportional to |
| A. | peak value of ac current |
| B. | average value of ac current |
| C. | rms value of ac current |
| D. | either (a) or (b) |
| Answer» B. average value of ac current | |
| 33. |
Which of the following effects is used in measurement of magnetic flux? |
| A. | Hall effect |
| B. | Seeback effect |
| C. | Piezo electric effect |
| D. | Photoelectric effect |
| Answer» B. Seeback effect | |
| 34. |
A 1 mA meter is to be converted to 1 A ammeter. The meter resistance is 100 Ω. The value of shunt resistance is |
| A. | 0.001 Ω |
| B. | 0.1001 Ω |
| C. | 100 Ω |
| D. | 1000 Ω |
| Answer» C. 100 Ω | |
| 35. |
In Weston frequency meter, the magnetic axes of the two fixed coils are |
| A. | parallel |
| B. | perpendicular |
| C. | inclined at 60° |
| D. | inclined at 15° |
| Answer» C. inclined at 60° | |
| 36. |
Induction wattmeter can be used in |
| A. | ac circuit only |
| B. | dc circuit only |
| C. | both ac and dc circuit |
| D. | ac 3 phase only |
| Answer» B. dc circuit only | |
| 37. |
Two wattmeter method of 3-phase power measurement can be used to find |
| A. | total active power |
| B. | total active power and power factor |
| C. | total active power and reactive power |
| D. | total active power, power factor, apparent power, and reactive power |
| Answer» E. | |
| 38. |
A moving iron instrument can be used for dc as well as ac. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 39. |
The use of thermocouple meters for ac measurement leads to a scale which is |
| A. | linear |
| B. | square law |
| C. | logarithmic |
| D. | exponential |
| Answer» C. logarithmic | |
| 40. |
Assertion (A): Electrodynamic instrument is not used as ammeter or voltmeter.Reason (R): Electrodynamic instrument is more costly than PMMC and moving iron instrument. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true R is false |
| D. | A is false R is true |
| Answer» B. Both A and R are true but R is not correct explanation of A | |
| 41. |
In an ac coordinate potentiometer, the currents inphase and quadrature potentiometer are adjusted to be |
| A. | out of phase by 90° |
| B. | in phase |
| C. | out of phase by 45° |
| D. | out of phase 180° |
| Answer» B. in phase | |
| 42. |
The resistance of a dc galvanometer is 20 Ω. A current of 10 mA causes full scale deflection. To convert it into 0-300 V voltmeter, we have to use a series resistance of |
| A. | 30000 Ω |
| B. | 29980 Ω |
| C. | 6000 Ω |
| D. | 15 Ω |
| Answer» C. 6000 Ω | |
| 43. |
A megger has a hand driven dc generator. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 44. |
Without a spectrum analyser, it is not possible to determine |
| A. | carrier frequency |
| B. | antenna pattern |
| C. | pulse width |
| D. | spurious signal strength and its location |
| Answer» B. antenna pattern | |
| 45. |
The scale of dynamometer wattmeter is non linear. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» C. May be True or False | |
| 46. |
With a variable reluctance tachometer having 60 rotor teeth the count reads 3600 counts per minute. The speed in RPM is |
| A. | 36 |
| B. | 60 |
| C. | 360 |
| D. | 3600 |
| Answer» C. 360 | |
| 47. |
It is required that a strain gauge has gauge factor of 100. The proper strain gauge is |
| A. | constantan strain gauge |
| B. | nichrome strain gauge |
| C. | semiconductor strain gauge |
| D. | alloy strain gauge |
| Answer» D. alloy strain gauge | |
| 48. |
The time base of a high frequency CRO whose screen diameter is 10 cm is set at 10 μ sec/cm. The lowest frequency which can be fully displayed on the screen is |
| A. | more than 100 kHz |
| B. | equal to 100 kHz |
| C. | equal to 10 kHz |
| D. | less than 10 kHz |
| Answer» D. less than 10 kHz | |
| 49. |
A moving coil meter has 10 Ω resistance and requires 40 mA for full scale deflection. The shunt resistance required to convert it into 0-2 A ammeter is |
| A. | 0.1021 Ω |
| B. | 0.2041 Ω |
| C. | 0.256 Ω |
| D. | 0.4210 Ω |
| Answer» C. 0.256 Ω | |
| 50. |
In a moving iron voltmeter the coil has a resistance of 20 Ω and an inductance of 0.3 H. The swamping resistance in 2000 Ω. To ensure correct reading with dc as well as 50 Hz ac, the value of capacitor to be connected in parallel with swamping resistance should be |
| A. | 0.0125 μF |
| B. | 0.0311 μF |
| C. | 0.0521 μF |
| D. | 0.0622 μF |
| Answer» C. 0.0521 μF | |