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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 | |