MCQOPTIONS
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MCQOPTIONS
This section includes 37 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The rate at which charge carriers flow is measured in |
| A. | Coulombs |
| B. | Amperes |
| C. | Watt-hour |
| D. | Watts |
| Answer» C. Watt-hour | |
| 2. |
An analog voltmeter uses external multiplier settings. With a multiplier setting of 20kΩ, it reads 440V and-with a multiplier setting of 80kΩ it reads 352V. For a multiplier setting of 40kΩ,voltmeter reads [GATE2012] |
| A. | 371V |
| B. | 383V |
| C. | 394V |
| D. | 406V |
| Answer» E. | |
| 3. |
An average-reading digital multimeter reads 10V when fed with a triangular wave, symmetric about the time-axis.For the same input an rms-reading meter will read [GATE] |
| A. | 20/√3 |
| B. | 10/√3 |
| C. | 20√3 |
| D. | 10√3 |
| Answer» B. 10/√3 | |
| 4. |
A voltmeter should have |
| A. | Low internal resistance |
| B. | High internal resistance |
| C. | Electrostatic plates |
| D. | A sensitive amplifier |
| Answer» C. Electrostatic plates | |
| 5. |
A watt-hour meter measures |
| A. | Voltage |
| B. | Current |
| C. | Energy |
| D. | Power |
| Answer» D. Power | |
| 6. |
The device used to indicate the presence of an electric current is |
| A. | . Electrometer |
| B. | Galvanometer |
| C. | Voltmeter |
| D. | Coulometer |
| Answer» C. Voltmeter | |
| 7. |
A hot-wire ammeter |
| A. | Can measure ac as well as dc |
| B. | Registers current changes very fast |
| C. | Can indicate very low voltages |
| D. | Measures electrical energy |
| Answer» B. Registers current changes very fast | |
| 8. |
The pressure coil of a dynamo meter type wattmeter is [GATE2009] |
| A. | Highly inductive |
| B. | Highly resistive |
| C. | Purely resistive |
| D. | Purely inductive |
| Answer» C. Purely resistive | |
| 9. |
The two inputs of a CRO are fed with two stationary periodic signals. In the X-Y mode, the screen shows a figure which changes from ellipse to circle and back to ellipse with its major axis changing orientation slowly and repeatedly. The following inference can be made from this. [GATE2009] |
| A. | The signals are not sinusoidal |
| B. | The amplitudes of the signals are very close but not equal |
| C. | The signals are sinusoidal with their frequencies very close but not equal |
| D. | There is a constant but small phase difference between the signals |
| Answer» E. | |
| 10. |
A piezoelectric crystal has a thickness of 2.5mm and a voltage sensitivity of 0.05Vm/N. The piezoelectric crystal is subjected to an external pressure of 1.6 x 106N/m2,then the corresponding output voltage is, [IES2010] |
| A. | 200V |
| B. | 3.2 x 109V/m of thickness |
| C. | 0.07 x 10-9V/(m3/New) |
| D. | . 200m V |
| Answer» B. 3.2 x 109V/m of thickness | |
| 11. |
The measurement of Hall coefficient of a semiconductor with one type of charge carrier gives the information about [IES2010] |
| A. | sign of charge carrier |
| B. | density of charge carrier |
| C. | both sign and density of charge carrier |
| D. | mass of the charge carrier |
| Answer» D. mass of the charge carrier | |
| 12. |
Consider the following units for the measurement of pressure directly: [IES2010] 1.Rolta meter 2.Bourdon tube 3.Planti meter 4.Vanes Of these, the pressure can be measured by |
| A. | 1 and 2 only |
| B. | 3 and 4 only |
| C. | 2 only |
| D. | 1,2,3 and 4 |
| Answer» D. 1,2,3 and 4 | |
| 13. |
If reflection coefficient for voltage be 0.6, the voltage standing wave ratio(VSWR) is [IES2010] |
| A. | 0.66 |
| B. | .4 |
| C. | .1.5 |
| D. | .2 |
| Answer» C. .1.5 | |
| 14. |
The meter movement in an illumination meter directly measures |
| A. | Current |
| B. | Power |
| C. | Voltage |
| D. | Energy |
| Answer» B. Power | |
| 15. |
In a dual trace oscilloscope, the display appears segmented when |
| A. | low frequency signals are observed in Alternate mode |
| B. | low frequency signals are observed in Chop mode |
| C. | high frequency signals are observed in Alternate mode |
| D. | high frequency signals are observed in Chop mode |
| Answer» E. | |
| 16. |
The trace on an oscilloscope continually moves to the right of the screen when |
| A. | The sweep is triggereD. |
| B. | The sweep period is larger than the signal perioD. |
| C. | The sweep period is smaller than the signal perioD. |
| D. | There is no weep. |
| Answer» D. There is no weep. | |
| 17. |
Transient signals can be observed using |
| A. | Storage oscilloscope |
| B. | Sampling oscilloscope |
| C. | Wave analyzer |
| D. | Spectrum analyzer |
| Answer» B. Sampling oscilloscope | |
| 18. |
Two sinusoidal signals of the same frequency are displayed on a dual-trace oscilloscope. One complete cycle of each signal covers 6 cm of the horizontal scale and the starting point of the horizontal scale and the starting point of the two signals are separated by 0.5 cm. The phase difference between the two signals in degrees is |
| A. | 30 |
| B. | 45 |
| C. | 60 |
| D. | 90 |
| Answer» B. 45 | |
| 19. |
An analog voltmeter has a sensitivity of 10k/volt. The galvanometer used in constructing the instrument will produce a full scale deflection when the current passed through it is[10] An analog voltmeter has a sensitivity of 10k |
| A. | 10 mA |
| B. | 20 mA |
| C. | 50 mA |
| D. | 100 μA |
| Answer» E. | |
| 20. |
A VU meter is never used to get a general indication of |
| A. | Sound intensity |
| B. | Visible light intensity |
| C. | Power in an audio amplifier |
| D. | Decibels |
| Answer» E. | |
| 21. |
A typical frequency counter |
| A. | Works by indirectly measuring voltage |
| B. | Is accurate to six digits or more |
| C. | Works by indirectly measuring current |
| D. | Has an analog readout |
| Answer» C. Works by indirectly measuring current | |
| 22. |
The utility meter’s motor speed depends directly on |
| A. | The number of watt hours being used at the time |
| B. | The number of ampere hours being used at the time |
| C. | The number of watts being used at the time |
| D. | The number of kilowatt hours being used at the time |
| Answer» D. The number of kilowatt hours being used at the time | |
| 23. |
Which is not function of the fuse? |
| A. | To ensure there is enough current available for and appliance to work right |
| B. | To make sure the current drawn by an appliance can not exceed a certain limit |
| C. | To limit the amount of power that a device can draw from the electrical circuit |
| D. | To make it impossible to use appliances that are too large for a given circuit |
| Answer» B. To make sure the current drawn by an appliance can not exceed a certain limit | |
| 24. |
Which will not normally cause a large error in an ohmmeter reading? |
| A. | A slight change in switchable internal resistance |
| B. | A small voltage between points under test |
| C. | A small change in the resistance to be measured |
| D. | A slight error in the range switch position |
| Answer» D. A slight error in the range switch position | |
| 25. |
To measure the applied power supply voltage to the electrical circuit, the voltmeter should be placed |
| A. | In series with the circuit that works from the supply |
| B. | Between the positive pole of the supply and the circuit working from the supply |
| C. | Between the negative pole of the supply and the circuit working from the supply |
| D. | In parallel with the circuit that works from the supply |
| Answer» E. | |
| 26. |
voltmeters should generally have |
| A. | High internal resistance |
| B. | Low internal resistance |
| C. | The ability to withstand large currents |
| D. | The greatest possible sensitivity |
| Answer» B. Low internal resistance | |
| 27. |
In two watt meter method of power measurement, if one of the watt meter shows zero reading, then it can be concluded that |
| A. | Power factor is unity |
| B. | Power factor is zero |
| C. | Power factor is 0.5 lagging |
| D. | Power factor is 0.5 leading |
| Answer» D. Power factor is 0.5 leading | |
| 28. |
An oscilloscope cannot be used to indicate |
| A. | Frequency |
| B. | Peak signal voltage |
| C. | Energy |
| D. | Wave shape |
| Answer» D. Wave shape | |
| 29. |
Choose the correct statement |
| A. | Digital multimeters are built using current measuring elements, while analog multimeters are built using voltage measuring units |
| B. | Digital multimeters are built using voltage measuring units, while analog multimeters are built using current measuring units |
| C. | Both digital and analog multimeters are built using voltage measuring units |
| D. | Both digital and analog multimeters are built using current measuring units |
| Answer» C. Both digital and analog multimeters are built using voltage measuring units | |
| 30. |
One of the following, which is not a transducer in the true sense, is ? |
| A. | Thermocouple |
| B. | Piezoelectric pick up |
| C. | Photo-Voltaic cell |
| D. | LCD |
| Answer» E. | |
| 31. |
When variable reluctance type tachometer has 150 teeth on the rotor & the counter records 13,500 pulses per second then the rotational speed will be? |
| A. | 4800 rpm |
| B. | 5400 rpm |
| C. | 6000 rpm |
| D. | 7200 rpm. |
| Answer» C. 6000 rpm | |
| 32. |
The most useful transducer for displacement sensing with excellent sensitivity, linearity and resolution is? |
| A. | an incremental encoder |
| B. | an absolute encoder |
| C. | LVDT |
| D. | a strain gauge |
| Answer» D. a strain gauge | |
| 33. |
The change in the direction of a compass needle, when a current carrying wire is brought near, is called |
| A. | Electromagnetic deflection |
| B. | Electroscopic force |
| C. | Magnetic force |
| D. | Electrostatic force |
| Answer» B. Electroscopic force | |
| 34. |
The major advantage of an electrostatic meter is |
| A. | It can handle large currents |
| B. | It measures very small currents |
| C. | It can detect and indicate ac voltages as well as dc voltages |
| D. | It draws a large current from a power supply. |
| Answer» D. It draws a large current from a power supply. | |
| 35. |
If the readings of the two watt meters in the 2 watt meter method of power measurement are 4.5 kW and 3.5 kW respectively and the latter reading has been obtained after reversing the current coil of the watt meter. What will be the total power in kW? |
| A. | 1 |
| B. | 3.5 |
| C. | 4.5 |
| D. | 8 |
| Answer» B. 3.5 | |
| 36. |
A thermocouple |
| A. | Gets warm when dc flows through it |
| B. | Is a thin, straight, special wire |
| C. | Generates ac when heated |
| D. | Generates dc when exposed to visible light |
| Answer» B. Is a thin, straight, special wire | |
| 37. |
The major advantage of electromagnet type meter over a permanent magnet meter is |
| A. | The electromagnet meter costs much less |
| B. | The permanent magnet meter has a more sluggish coil |
| C. | The electromagnet meter need not be aligned with the earth’s magnetic field |
| D. | The electromagnet meter is more rugged |
| Answer» E. | |