MCQOPTIONS
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MCQOPTIONS
This section includes 147 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. |
One coulomb of charge is equal to the charge of |
| A. | 1.095 x 10 –19 electrons |
| B. | 1.625 x 10–31 electrons |
| C. | 6.242 x 1018 electrons |
| D. | 6.025 x 10–19 electrons |
| Answer» D. 6.025 x 10–19 electrons | |
| 2. |
Specific resistance of a material is |
| A. | Directly proportional to the both area of cross section and length of material |
| B. | Directly proportional to the area of cross section and inversely proportional to the length of material |
| C. | Inversely proportional to the area of cross section and directly proportional to the length of material |
| D. | Inversely proportional to the both area of cross section and length of material |
| Answer» C. Inversely proportional to the area of cross section and directly proportional to the length of material | |
| 3. |
In half wave rectifiers, diode conducts during |
| A. | Only positive half cycle |
| B. | Only negative half cycle |
| C. | Both positive and negative half cycle |
| D. | Neither in positive half cycle nor in negative half cycle |
| Answer» B. Only negative half cycle | |
| 4. |
Reciprocal of resistance is called |
| A. | Resistivity |
| B. | Conductance |
| C. | Resonance |
| D. | None of the above |
| Answer» C. Resonance | |
| 5. |
Resistance of a wire is directly proportional to its |
| A. | Length |
| B. | Diameter |
| C. | Area of cross section |
| D. | All of the above |
| Answer» B. Diameter | |
| 6. |
Any charged conductor, which receives electricity from the earth, when connected to it, is said to be |
| A. | Zero potential |
| B. | –ve potential |
| C. | +ve potential |
| D. | None of the above |
| Answer» C. +ve potential | |
| 7. |
The ____ is responsible for the current to flow in a closed circuit. |
| A. | Electric charge |
| B. | Potential difference |
| C. | Resistance |
| D. | All of the above |
| Answer» C. Resistance | |
| 8. |
One columb is approximately equal to |
| A. | 624 x 10^12 |
| B. | 624 x 10^14 |
| C. | 624 x 10^16 |
| D. | 624 x 10^18 |
| Answer» D. 624 x 10^18 | |
| 9. |
The SI unit for measurement of electric charge is |
| A. | volt |
| B. | columb |
| C. | ohm |
| D. | farad |
| Answer» C. ohm | |
| 10. |
-A body contains electrons more than its normal number has |
| A. | +ve charge |
| B. | –ve charge |
| C. | No charge |
| D. | None of the above |
| Answer» C. No charge | |
| 11. |
The mechanical losses are about _____ % of full load losses |
| A. | 0 to 10 |
| B. | 10 to 20 |
| C. | 20 to 30 |
| D. | 30 to 40 |
| Answer» C. 20 to 30 | |
| 12. |
Iron or magnetic losses are also called |
| A. | Core losses |
| B. | Field losses |
| C. | Copper losses |
| D. | Armature losses |
| Answer» B. Field losses | |
| 13. |
Shaft torque equals to |
| A. | Net torque |
| B. | Friction torque |
| C. | Net torque + Friction torque + Torque lost |
| D. | Net torque – (Friction torque + Torque lost) |
| Answer» E. | |
| 14. |
To produce dynamically induced emf, the following is (are) necessary |
| A. | A magnetic field |
| B. | A conductor |
| C. | Motion of conductor with respect to the field |
| D. | All of the above |
| Answer» E. | |
| 15. |
A motor converts |
| A. | Mechanical energy into electrical energy |
| B. | Chemical energy into electrical energy |
| C. | Electrical energy into Mechanical energy |
| D. | Electrical energy into chemical energy |
| Answer» D. Electrical energy into chemical energy | |
| 16. |
Which of the following generators have two field windings? |
| A. | Series wound generator |
| B. | Shunt wound generator |
| C. | Compound wound generator |
| D. | All of the above |
| Answer» D. All of the above | |
| 17. |
-The following is (are) keyed to the shaft |
| A. | Armature core |
| B. | Commutator |
| C. | Cooling fan |
| D. | All of the above |
| Answer» E. | |
| 18. |
For larger machines |
| A. | Ball bearings are used at both driving and non driving ends. |
| B. | Ball bearings are used at driving end and roller bearings are used at non driving end. |
| C. | Roller bearings are used at driving end and ball bearings are used at non driving end |
| D. | Roller bearings are used at both driving and non driving ends. |
| Answer» D. Roller bearings are used at both driving and non driving ends. | |
| 19. |
The brushes are ____ in shape. |
| A. | Triangular |
| B. | Rectangular |
| C. | Cylindrical |
| D. | Square |
| Answer» C. Cylindrical | |
| 20. |
Function of _____ is to collect current from the commutator and supply it to the external load. |
| A. | Field magnet |
| B. | Armature |
| C. | Brushes |
| D. | Yoke |
| Answer» D. Yoke | |
| 21. |
The following is (are) the part(s) of a field magnet. |
| A. | Yoke |
| B. | Pole cores |
| C. | Pole shoes |
| D. | All of the above |
| Answer» E. | |
| 22. |
The special device which converts AC into DC and vice versa is known as |
| A. | Armature |
| B. | Slip rings |
| C. | Split rings |
| D. | Field magnets |
| Answer» D. Field magnets | |
| 23. |
The following magnet is used in large machines to create magnetic flux |
| A. | Permanent magnet |
| B. | Electro magnet |
| C. | Temporary magnet |
| D. | Any of the above |
| Answer» C. Temporary magnet | |
| 24. |
-In a DMA write operation the data is transferred |
| A. | From I/O to memory. |
| B. | From memory to I/O. |
| C. | from memory to memory |
| D. | from I/O to I/O |
| Answer» B. From memory to I/O. | |
| 25. |
The decimal value for the BCD coded number 000100l0 is |
| A. | 6 |
| B. | 10 |
| C. | 12 |
| D. | 18 |
| Answer» D. 18 | |
| 26. |
A 3 x 8 decoder with two enable inputs is to be used to address 8 blocks of memory. What will be the size of each memory block when addressed from a sixteen bit bus with two MSBs used to enable the decoder? |
| A. | 2K |
| B. | 4K |
| C. | l6K |
| D. | 64K |
| Answer» D. 64K | |
| 27. |
Input impedance of MOSSFET is |
| A. | less than of FET but more than BJT |
| B. | More than that of FET and BJT |
| C. | more than that of FET but less than BJT |
| D. | less than that of FET and BJT |
| Answer» C. more than that of FET but less than BJT | |
| 28. |
Compared to bipolar transistor, a JFET has |
| A. | Lower input impedance |
| B. | Higher voltage gain – |
| C. | Higher input impedance and high voltage gain |
| D. | Higher input impedance and low voltage gain |
| Answer» E. | |
| 29. |
The fastest switching logic family is |
| A. | CMOS |
| B. | TTL |
| C. | DTL |
| D. | ECL |
| Answer» E. | |
| 30. |
-In a sample and hold circuit the following statement is false: |
| A. | Sample time is much smaller than hold time. |
| B. | Aperture time is the delay between the time that the pulse is applied to the switch and the actual time the switch closes. |
| C. | Acquisition time is the tin-re it takes for the capacitor to charge from one voltage to another voltage |
| D. | The voltage across the hold capacitor changes by 50% during hold time |
| Answer» B. Aperture time is the delay between the time that the pulse is applied to the switch and the actual time the switch closes. | |
| 31. |
How many comparators would a 12-bit flash ADC require? |
| A. | 4095 |
| B. | 3095 |
| C. | 4000 |
| D. | 2512 |
| Answer» B. 3095 | |
| 32. |
A 32 to 1 multiplexer has the following features. |
| A. | 32 inputs, one output and 5 control signals |
| B. | 32 outputs, one input and 5 control signals |
| C. | 5 inputs, one control signal and 32 outputs |
| D. | 5 inputs 32 control signals and one output |
| Answer» B. 32 outputs, one input and 5 control signals | |
| 33. |
The property due to which the resistance of some metal or compound vanishes under certain conditions is known as |
| A. | Semi conductivity. |
| B. | Magnetostriction. |
| C. | Curie point. |
| D. | Super conductivity. |
| Answer» E. | |
| 34. |
Hall effect may be used for which of the following |
| A. | Determining whether the semiconductor is p or n type |
| B. | Determining the carrier concentration |
| C. | Calculating the mobility |
| D. | Al of the above |
| Answer» E. | |
| 35. |
Gold and silver are |
| A. | Dielectric materials |
| B. | Low resistivity conducting materials |
| C. | Magnetic materials |
| D. | Insulating materials |
| Answer» C. Magnetic materials | |
| 36. |
Which of the following is a low-gain antenna? |
| A. | Dish antenna on a space craft |
| B. | Wi-Fi antenna |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» C. Both a. and b. | |
| 37. |
Maxwell’s equations involve ________. |
| A. | Charge density |
| B. | Current density |
| C. | Magnetic intensity |
| D. | All of these |
| Answer» E. | |
| 38. |
The control system design specification for a chemical process is described as short settling time, improved damping and zero steady state error. What control do we choose? |
| A. | P |
| B. | PI |
| C. | ID |
| D. | PID |
| Answer» E. | |
| 39. |
Addition of zeros in transfer function causes which of the following? |
| A. | Lead-compensation |
| B. | Lag-compensation |
| C. | Lead-lag compensation |
| D. | None of the above |
| Answer» C. Lead-lag compensation | |
| 40. |
Which of the following is the best method for determining the stability and transient response? |
| A. | Root locus |
| B. | Bode Plo |
| C. | Nyquist plot |
| D. | None of the above |
| Answer» B. Bode Plo | |
| 41. |
A good control system has all the following features except |
| A. | Good stability |
| B. | Slow response |
| C. | Good accuracy |
| D. | Sufficient power handling capacity |
| Answer» C. Good accuracy | |
| 42. |
The steady-state error of a feedback control system with an acceleration input becomes finite in a |
| A. | Type 0 system. |
| B. | Type I system |
| C. | Type 2 system |
| D. | Type 3 system. |
| Answer» D. Type 3 system. | |
| 43. |
A chopper can be used on |
| A. | Pulse width modulation only |
| B. | Frequency modulation only |
| C. | Amplitude modulation only |
| D. | both (A) and (C) |
| Answer» E. | |
| 44. |
If the capacitor of a single phase motor is short circuited |
| A. | The motor will not start |
| B. | The motor will run |
| C. | The motor will run in reverse direction |
| D. | The motor will run in the same direction at reduced RPM |
| Answer» B. The motor will run | |
| 45. |
The generation of harmonics in transformer is mainly due to |
| A. | Fluctuating load |
| B. | Poor insulation |
| C. | Mechanical vibrations |
| D. | Saturation of core |
| Answer» E. | |
| 46. |
The number of bits needed to address 4kb memory is |
| A. | 6 |
| B. | 8 |
| C. | 12 |
| D. | 16 |
| Answer» D. 16 | |
| 47. |
Which of the following is the most stable oscillator? |
| A. | Wein’s bridge oscillator |
| B. | Hartley’s oscillator |
| C. | Colpitt’s oscillator |
| D. | Crystal oscillator |
| Answer» E. | |
| 48. |
Common Mode Rejection ratio (CMRR) for a differential amplifier is the ratio of |
| A. | Differential gain / Common mode gain |
| B. | Differential gain / Integrated gain |
| C. | Integrated gain / Differential gain |
| D. | Common mode gain / Differential gain |
| Answer» B. Differential gain / Integrated gain | |
| 49. |
Which family of logic circuits used FETs? |
| A. | TTL |
| B. | CMOS |
| C. | Both TTL and CMOS |
| D. | None of the above |
| Answer» C. Both TTL and CMOS | |
| 50. |
The following amplifier configuration yields the largest power gain of all transistor amplifier configurations. |
| A. | Common base |
| B. | Common emitter |
| C. | Common collector |
| D. | Emitter base |
| Answer» C. Common collector | |