MCQOPTIONS
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MCQOPTIONS
This section includes 252 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. |
Usually batteries are used in the UPS systems. |
| A. | nc |
| B. | li-on |
| C. | lead acid |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| 2. |
In a centre tapped full wave rectifier, RL=1KΩ and for diode Rf=10Ω. The primary voltage is 800sinωt with transformer turns ratio=2. The ripple factor will be |
| A. | 54% |
| B. | 48% |
| C. | 26% |
| D. | 81% |
| Answer» C. 26% | |
| 3. |
In a Darlington pair, the overall β=15000.β1=100. Calculate the collector current for Q2 given base current for Q1 is 20 μA. |
| A. | 300 ma |
| B. | 298 ma |
| C. | 2 ma |
| D. | 200ma |
| Answer» C. 2 ma | |
| 4. |
In the given circuit, hfe = 50 and hie = 1000Ω, find overall input and output resistance. |
| A. | ri=956Ω, ro=1.6 kΩ |
| B. | ri=956 kΩ, ro=2 kΩ |
| C. | ri=956 Ω, ro=2 kΩ |
| D. | ri=900Ω, ro=10 kΩ |
| Answer» D. ri=900Ω, ro=10 kΩ | |
| 5. |
The transconductance of a B.J.T.is 5mS (gm) while a 2KΩ (Rl) load resistance is connected to the C.E. stage. Neglecting Early effect, what is the Miller multiplication factor for the input side? |
| A. | 21 |
| B. | 11 |
| C. | 20 |
| Answer» C. 20 | |
| 6. |
In Miller’s theorem, what is the constant K? |
| A. | total voltage gain |
| B. | internal voltage gain |
| C. | internal current gain |
| D. | internal power gain |
| Answer» C. internal current gain | |
| 7. |
During high frequency applications of a B.J.T., which of the following three stages do not get affected by Miller’s approximation? |
| A. | c.e. |
| B. | c.b. |
| C. | c.c. |
| D. | follower |
| Answer» C. c.c. | |
| 8. |
What is the output as a function of the input voltage (for positive values) for the given figure. Assume it’s an ideal op-amp with zero forward drop (Di=0) |
| A. | 0 |
| B. | -vi |
| C. | vi |
| D. | 2vi |
| Answer» D. 2vi | |
| 9. |
HVDC transmission has as compared to HVAC transmission. |
| A. | smaller transformer size |
| B. | smaller conductor size |
| C. | higher corona loss |
| D. | smaller power transfer capabilities |
| Answer» C. higher corona loss | |
| 10. |
Which parasitic capacitors don’t affect the frequency response of the C.B. stage of the B.J.T.? |
| A. | none of the parasitic capacitances |
| B. | all the parasitic capacitances |
| C. | some of the coupling capacitors |
| D. | ccs and cb |
| Answer» C. some of the coupling capacitors | |
| 11. |
Process transconductance parameter is 40μA/V2. Find drain to source current in saturation. |
| A. | 0.10 ma |
| B. | 0.05ma c) – 0.05ma |
| C. | – 50a |
| Answer» D. | |
| 12. |
is used for critical loads where temporary power failure can cause a great deal of inconvenience. |
| A. | smps |
| B. | ups |
| C. | mps |
| D. | rccb |
| Answer» C. mps | |
| 13. |
Obtain the collector voltage, for collector resistor (RC) =5.6kΩ, IE=1.664mA and VCC=10v for single input unbalanced output differential amplifier |
| A. | 0.987v |
| B. | 0.682v c) 0.555v |
| C. | none of the mentioned |
| Answer» C. none of the mentioned | |
| 14. |
For the given circuit, input resistance RI = 20Ω, hfe = 50. Output resistance = ∞. Find the new values of input and output resistance, if a base resistance of 2kΩ is added to the circuit. |
| A. | ri = 20Ω, ro = ∞ |
| B. | ri = 20Ω, ro = 2kΩ |
| C. | ri = 59Ω, ro = ∞ |
| D. | ri = 59Ω, ro = 2kΩ |
| Answer» D. ri = 59Ω, ro = 2kΩ | |
| 15. |
Which parasitic capacitors don’t affect the frequency response of the C.C. stage of the B.J.T.? |
| A. | ccs |
| B. | ccs and cb |
| C. | cb |
| D. | ccs and cµ |
| Answer» B. ccs and cb | |
| 16. |
Given that transition capacitance is 5 pico F and diffusion capacitance is 80 pico F, and base emitter dynamic resistance is 1500 Ω, find the β cut-off frequency. |
| A. | 7.8 x 106 rad/s |
| B. | 8.0 x 106 rad/s c) 49.2 x 106 rad/s d) 22.7 x 106 rad/s |
| Answer» B. 8.0 x 106 rad/s c) 49.2 x 106 rad/s d) 22.7 x 106 rad/s | |
| 17. |
The hfe parameter is called in CE arrangement with output short circuited. |
| A. | voltage gain |
| B. | current gain |
| C. | input impedance |
| D. | output impedance |
| Answer» C. input impedance | |
| 18. |
Consider a Darlington amplifier. In the self bias network, the biasing resistances are 220kΩ and 400 kΩ. What can be the correct value of input resistance if hfe=50 and emitter resistance = 10kΩ. |
| A. | 141 kΩ |
| B. | 15 mΩ |
| C. | 20 mΩ |
| D. | 200 kΩ |
| Answer» B. 15 mΩ | |
| 19. |
The values of h-parameters of a transistor in CE arrangement are arrangement. |
| A. | same as for cb |
| B. | same as for cc |
| C. | different from that in cb |
| D. | similar to no |
| Answer» D. similar to no | |
| 20. |
A full wave rectifier delivers 50W to a load of 200Ω. If the ripple factor is 2%, calculate the AC ripple across the load. |
| A. | 2v |
| B. | 5v |
| C. | 4v |
| D. | 1v |
| Answer» B. 5v | |
| 21. |
In a Single Input Balanced Output Differential amplifier, given VCC=15v, RE = 3.9kΩ, VCE=2.4 v and re=250Ω. Determine Voltage gain |
| A. | 26 |
| B. | 56 |
| C. | 38 |
| D. | 61 |
| Answer» B. 56 | |
| 22. |
005mmhos, hre=0. Find the output impedance if the lad resistance is 5kΩ. |
| A. | 5kΩ |
| B. | 4kΩ |
| C. | 20kΩ |
| D. | 15kΩ |
| Answer» C. 20kΩ | |
| 23. |
For a self-bias circuit, find drain to source voltage if VDD=12V, ID=1mA, Rs=RD=1KΩ? |
| A. | 1v |
| B. | 2v |
| C. | 10v |
| D. | 5v |
| Answer» D. 5v | |
| 24. |
A transistor has hie =2kΩ, hoe=25µmhos and hfe=60 with an unbypassed emitter resistor Re=1kΩ. What will be the input resistance and output resistance? |
| A. | 90kΩ and 50kΩ respectively |
| B. | 33kΩ and 45kΩ respectively |
| C. | 6kΩ and 40kΩ respectively |
| D. | 63kΩ and 40kΩ respectively |
| Answer» E. | |
| 25. |
A transistor has hie =1KΩ and hfe=60 with an bypassed emitter resistor Re=1kΩ. What will be the input resistance and output resistance? |
| A. | 90kΩ and 50kΩ respectively |
| B. | 33kΩ and 45kΩ respectively |
| C. | 6kΩ and 40kΩ respectively |
| D. | 63kΩ and 40kΩ respectively |
| Answer» E. | |
| 26. |
There are two transistors A and B having ‘S’ as 25 and 250 respectively, on comparing the value of S, we can say B is more stable than A. |
| A. | true |
| B. | false |
| Answer» C. | |
| 27. |
In the given situation for n-channel JFET, we get drain-to-source current is 5mA. What is the current when VGS = – 6V? |
| A. | 5 ma |
| B. | 0.5a |
| C. | 0.125 a |
| D. | 0.5a |
| Answer» D. 0.5a | |
| 28. |
What is the current flowing through the R1 resistor for voltage divider (R1=R2=1KΩ, VDD=10V)? |
| A. | 5ma |
| B. | 3ma |
| C. | 1ma |
| D. | 2ma |
| Answer» B. 3ma | |
| 29. |
Consider an RC coupled amplifier at low frequency. Internal voltage gain is -120. Find the voltage gain magnitude, when given that collector resistance = 1kΩ, load = 9kΩ, collector capacitance is 0. is 0.1μF, and input frequency is 20Hz. |
| A. | 120 |
| B. | 12 |
| C. | 15 d) -12 |
| Answer» D. | |
| 30. |
Find net voltage gain, given hfe = 50 and hie = 1kΩ. |
| A. | 27.68 |
| B. | -22 |
| C. | 30.55 |
| D. | -27.68 |
| Answer» E. | |
| 31. |
Find the gate voltage for voltage divider having R1=R2=1KΩ and VDD=5V? |
| A. | 1v |
| B. | 5v |
| C. | 3v |
| D. | 2.5v |
| Answer» E. | |
| 32. |
When applying miller’s theorem to resistors, resistance R1 is for node 1 and R2 for node 2. If R1>R2, then for same circuit, then for capacitance for which the theorem is applied, which will be larger, C1 or C2? |
| A. | c1 |
| B. | c2 |
| C. | both are equal |
| D. | insufficient data |
| Answer» B. c2 | |
| 33. |
Find the gate to source voltage for voltage divider having R1=R2=2KΩ and VDD=12V, ID=1mA and RS=4KΩ? |
| A. | 3v |
| B. | 2v |
| C. | 0v |
| D. | 1v |
| Answer» C. 0v | |
| 34. |
1, α2 = 1.5 what is the transconductance of the entire network? |
| A. | 80 mΩ-1 |
| B. | 75 mΩ-1 |
| C. | 33 mΩ-1 |
| D. | 55 mΩ-1 |
| Answer» E. | |
| 35. |
Given hfe = 60, hie=1000Ω, hoe = 20μ Ω–, hre = 2 * 10-4. Find the current gain of the BJT, correct up to two decimal points. |
| A. | – 58.44 |
| B. | -59.21 |
| C. | – 60.10 |
| D. | – 60.00 |
| Answer» B. -59.21 | |
| 36. |
Find IC, given VCE=0.77v, VCC=10v, VBE=0.37v and RC=2.4kΩ in Dual Input Balanced Output differential amplifier |
| A. | 0.4ma |
| B. | 0.4a |
| C. | 4ma |
| D. | d) 4a |
| Answer» D. d) 4a | |
| 37. |
Consider the circuit. Given hfe = 50, hie = 1200Ω. Find voltage gain. |
| A. | – 278 |
| B. | -277.9 |
| C. | – 300 |
| D. | – 280 |
| Answer» B. -277.9 | |
| 38. |
Filter used in switching regulator’s are also as called |
| A. | dc – ac transformers |
| B. | ac – dc transformers |
| C. | dc transformer |
| D. | ac transformer |
| Answer» D. ac transformer | |
| 39. |
In CB configuration, the value of α=0.98A. A voltage drop of 4.9V is obtained across the resistor of 5KΩ when connected in collector circuit. Find the base current. |
| A. | 0.01ma |
| B. | 0.07ma |
| C. | 0.02ma |
| D. | 0.05ma |
| Answer» D. 0.05ma | |
| 40. |
For the BJT, β=∞, VBEon=0.7V VCEsat=0.7V. The switch is initially closed. At t=0, it is opened. At which time the BJT leaves the active region? |
| A. | 20ms |
| B. | 50ms |
| C. | 60ms |
| D. | 70ms |
| Answer» C. 60ms | |
| 41. |
The diode in a half wave rectifier has a forward resistance RF. The voltage is Vmsinωt and the load resistance is RL. The DC current is given by |
| A. | vm/√2rl |
| B. | vm/(rf+rl)π |
| C. | 2vm/√π |
| D. | vm/rl |
| Answer» C. 2vm/√π | |
| 42. |
Due to centre tap Vm=400/2=200) IRMS=198/√2=140mA, IAVG=2*198/ π=126mA. ϒ=[(140/126)2-1]1/2=0.48. So, ϒ=48%. |
| A. | 0.623 |
| B. | 0.678 |
| C. | 0.693 |
| D. | 0.625 |
| Answer» D. 0.625 | |
| 43. |
Which of the application’s filters used for? |
| A. | reducing ripples |
| B. | increasing ripples |
| C. | increasing phase change |
| D. | increasing amplitude |
| Answer» B. increasing ripples | |
| 44. |
Consider the following circuit. IDSS = 2mA, VDD = 30V. Find R, given that VP = – 2V. |
| A. | 10kΩ |
| B. | 4kΩ |
| C. | 2kΩ |
| D. | 5kΩ |
| Answer» C. 2kΩ | |
| 45. |
Gain bandwidth frequency is GBP= 3000 Mhz. The cut-off frequency is f=10Mhz. What is the CE short circuit current gain at the β cutoff frequency? |
| A. | 212 |
| B. | 220 |
| C. | 300 |
| D. | 200 |
| Answer» B. 220 | |
| 46. |
Determine the voltage gain for the given circuit known that R1 = R3 = 10kΩ abd R2 = R4 = 100kΩ. |
| A. | 1 |
| B. | 10 c) 100 d) 1000 |
| Answer» C. | |
| 47. |
is used in the rotating type UPS system to supply the mains. |
| A. | dc motor |
| B. | self excited dc generator |
| C. | alternator |
| D. | battery bank |
| Answer» D. battery bank | |
| 48. |
Consider the following circuit, where source current = 10mA, hfe = 50, hie = 1100Ω, then for the transistor circuit, find output resistance RO and input resistance RI. |
| A. | ro = 0, ri = 21Ω |
| B. | ro = ∞, ri = 0Ω |
| C. | ro = ∞, ri = 21Ω |
| D. | ro = 10, ri = 21Ω |
| Answer» D. ro = 10, ri = 21Ω | |
| 49. |
From the given circuit, using a silicon BJT, what is the value of VCEQ? |
| A. | 7 v |
| B. | 0.7 v |
| C. | 6.83 v |
| D. | 7.17 v |
| Answer» D. 7.17 v | |
| 50. |
Which of the following are not the standard value of Zener diodes? |
| A. | 5.1 v |
| B. | 5.6 v |
| C. | 5.8v |
| D. | 6.2v |
| Answer» D. 6.2v | |