electrical engineering Mcqs
1. economics of power generation2. analog electronics3. solid state switching circuits4. parallel circuits5. switchgear and protection6. op amp circuits7. transistor audio power amplifiers8. electrostatics9. heating and welding10. multi stage transistor amplifiers11. passive filters12. network theorems13. regulated d c power supply14. a c fundamentals circuits and circuit theory15. electromagnetic induction16. power electronics17. magnetism and electromagnetism18. transformers19. modulation and demodulation20. d c generators21. semiconductor theory22. single phase induction motors23. semiconductor diode24. hybrid parameters25. digital electronics26. oscillators27. earthing or grounding28. single stage transistor amplifiers29. d c motors30. transistor biasing31. amplifiers with negative feedback32. basic electrical33. electronic instruments34. synchronous motors35. field effect transistors fet36. magnetic circuit37. control systems38. industrial drives39. power generation40. series parallel circuits41. transistor tuned amplifiers42. electrical engineering materials43. rectifiers and converters44. integrated circuits45. scr silicon controlled rectifiers46. cables47. polyphase induction motors48. measurement and instrumentation49. transistors50. electrical machine design51. electrolysis and storage of batteries52. electric traction53. transmission and distribution
4401. A linear resistor having 0 < R < o is a______________?
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A. current controlled resistor

B. voltage controlled resistor

C. both current controlled and voltage controlled resistor

D. none of the above

4402. A terminal where three on more branches meet is known as______________?
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A. combination

B. anode

C. node

D. terminus

4403. Kirchhoff s law is not applicable to circuits with____________?
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A. lumped parameters

B. distributed parameters

C. passive elements

D. non-linear resistances

4404. The concept on which Superposition theorem is based on_____________?
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A. duality

B. non-linearity

C. reciprocity

D. linearity
4405. Which of the following is non-linear circuit parameter?
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A. Wire wound resistor

B. Transistor

C. Condenser

D. Inductance

4406. The number of independent equations to solve a network is equal to_____________?
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A. the number of chords

B. the number of branches

C. sum of number of branches, chords and nodes

D. sum of the number of branches and chords

4407. Millmans theorem yields____________?
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A. equivalent impedance

B. equivalent voltage source

C. equivalent resistance

D. equivalent voltage or current source
4408. Which of the following is the passive element?
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A. Capacitance

B. Ideal voltage source

C. Ideal current source

D. All of the above

4409. A network which contains one or more than one source of e.m.f. is known as___________?
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A. linear network

B. passive network

C. non-linear network

D. active network
4410. A passive network is one which contains____________?
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A. no source of e.m.f. in it

B. only some sources of e.m.f. in it

C. only variable resistances

D. only two sources of e.m.f. in it

4411. Efficiency of power transfer when maximum transfer of power c xerosis
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A. 75%

B. 50%

C. 100%

D. 80%

4412. For maximum transfer of power, internal resistance of the source should be_____________?
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A. none of the above

B. equal to load resistance

C. less than the load resistance

D. greater than the load resistance

4413. Thevenin resistance Rth is found
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A. by short-circuiting the given two terminals

B. by removing voltage sources along with their internal resistances

C. between same open terminals as for Etk

D. between any two open terminals

4414. In any network containing more than one sources of e.m.f. the current in any branch is the algebraic sum of a number of individual fictitious currents (the number being equal to the number of sources of e.m.f.), each of which is due to separate action of each source of e.m.f., taken in order, when the remaining sources of e.m.f. are replaced by conductors, the resistances of which are equal to the internal resistances of the respective sources. The above statement is associated with:
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A. Nortons theorem

B. Superposition theorem

C. Thevenins theorem

D. None of the above

4415. Kirchhoffs current law is applicable to only
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A. electric circuits

B. electronic circuits

C. closed loops in a network

D. junction in a network
4416. Superposition theorem can be applied only to circuits having____________?
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A. resistive elements

B. passive elements

C. non-linear elements

D. linear bilateral elements
4417. Kirchhoffs voltage law is related to_____________?
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A. junction currents

B. battery e.m.fs.

C. IR drops

D. both B. and C.

E. none of the above

4418. The circuit has resistors, capacitors and semi-conductor diodes. The circuit will be known as___________?
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A. non-linear circuit

B. linear circuit

C. bilateral circuit

D. none of the above

4419. Any number of current sources in parallel may be replaced by a single current source whose current is the algebraic sum of individual source currents and source resistance is the parallel combination of individual source resistances. This statement is associated with:
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A. Millmans theorem

B. None of the above

C. Maximum power transfer theorem

D. Thevenins theorem

4420. To determine the polarity of the voltage drop across a resistor, it is necessary to know___________?
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A. value of current through the resistor

B. direction of current through the resistor

C. value of resistor

D. e.m.fs. in the circuit

4421. A star circuit has element of resistance R/2. The equivalent delta elements will be_____________?
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A. 2R

B. R/6

C. 4R

D. fi?
4422. The resistance LM will be____________?
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A. 6.66 Q

B. 20Q

C. 12 Q

D. 18Q

4423. If the load current drawn by unregulated power supply increases, the d.c. output voltage _____________?
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A. Decreases

B. Stays the same

C. Increases

D. None of the above

4424. A Zener diode is used as a _____________voltage regulating device?
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A. Series-shunt

B. None of the above

C. Series

D. Shunt
4425. Commercial power supplies have voltage regulation ______________?
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A. within 1%

B. of 15%

C. of 10%

D. of 25%

4426. If the doping level is increased, the breakdown voltage of the Zener_______________?
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A. None of the above

B. Remains the same

C. Is decreased

D. Is increased

4427. A 5 mA changes in Zener current produces a 50 mA change in Zener voltage. What is the Zener impedance ?
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A. 1 O

B. 1 O

C. 100 O

D. 10 O
4428. Which of these is the best description for a Zener diode ?
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A. It works in the forward region

B. It is a constant-voltage device

C. It is a constant current device

D. It is a diode

4429. As the junction temperature increases, the voltage breakdown point for Zener mechanism _______________?
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A. Remains the same

B. Is increased

C. None of the above

D. Is decreased
4430. What is true about the breakdown voltage in a Zener diode ?
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A. It equals current times the resistance

B. It is approximately constant

C. It decreases when load current increases

D. It destroys the diode

4431. For increasing the voltage rating, zeners are connected in_____________?
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A. Series-parallel

B. Parallel

C. Series

D. None of the above

4432. The rupture of co-valent bonds will occur when the electric field is__________________?
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A. 1000 V/cm

B. 6 V/cm

C. More than 105 V/cm

D. 100 V/cm

4433. When load current is zero, the Zener current will be_____________?
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A. Zero

B. Minimum

C. None of the above

D. Maximum
4434. A power supply can deliver a maximum rated current of 0.5 A at full-load output voltage of 20 V. What is the minimum load resistance that you can connect across the supply?
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A. 10 O

B. 40 O

C. 15 O

D. 20 O

4435. A Zener regulator _____________ in the power supply?
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A. Increases the ripple

B. Decreases the ripple

C. Data insufficient

D. Neither increases nor decreases the ripple

4436. In an unregulated power supply, if input a.c. voltage increases, the output voltage _______________?
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A. Increases

B. Remains the same

C. None of the above

D. Decreases

4437. A power supply which has voltage regulation of ____________ is unregulated power supply?
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A. 10 %

B. 5%

C. 0%

D. 8%

4438. Zener diode can be used as__________________?
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A. c. voltage regulator only

B. c. voltage regulator only

C. both D.C and A.C voltage regulator

D. none of the above

4439. A Zener voltage regulator is used for ____________ load currents?
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A. Small

B. High

C. Very high

D. Moderate

4440. In a regulated power supply, two similar 15 V zeners are connected in series. The input voltage is 45 V d.c. If each Zener has a maximum current rating of 300 mA, what should be the value of the series resistance ?
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A. 25 O

B. 10 O

C. 40 O

D. 50 O
4441. A certain regulator has a no-load voltage of 6 V and a full-load output of 5.82 V. What is the load regulation ?
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A. 09%

B. None of the above

C. 87%

D. 72%

4442. Zener diode are generally made of _____________?
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A. Germanium

B. None of the above

C. Carbon

D. Silicon
4443. If the load current drawn by unregulated power supply increases, the d.c. output voltage______________?
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A. Decreases

B. None of the above

C. Stays the same

D. Increases

4444. A power supply has a voltage regulation of 1%. If the no-load voltage is 20 V, what is the full-load voltage ?
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A. 2 V

B. 6 V

C. 7 V

D. 8 V
4445. An ideal regulated power supply is one which has voltage regulation of________________?
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A. 5%

B. 0%

C. 10%

D. 1%

4446. As the junction temperature increases, the voltage breakdown point for avalanche mechanism______________?
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A. Increases

B. Remains the same

C. None of the above

D. Decrease

4447. The current in a Zener diode is limited by _______________?
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A. External resistance

B. Power dissipation

C. Both (A) and (B)

D. None of the above

4448. If the load resistance decreases in a Zener regulator, then Zener current ______________?
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A. Stays the same

B. None of the above

C. Increases

D. Decreases
4449. The Zener current will be minimum when_____________?
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A. Load current is minimum

B. Load current is maximum

C. Load current is zero

D. None of the above

4450. A 30 V Zener will have depletion layer width_______________ that of 10 V Zener?
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A. Equal to

B. More than

C. None of the above

D. Less than