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
5551. If the collector supply is 10V, then collector cut off voltage under d.c. conditions is _______________?
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A. 2 V

B. 10 V

C. 20 V

D. 5 V

5552. A single stage transistor amplifier with collector load RC and emitter resistance RE has a d.c. load of ________________________?
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A. RC RE

B. RC || RE

C. RC + RE

D. RC

5553. The input capacitor in an amplifier is the______________ capacitor?
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A. Leakage

B. Coupling

C. Bypass

D. None of the above

5554. If a transistor amplifier draws 2mA when input voltage is 10 V, then its input impedance is ____________?
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A. 5 k?

B. 10 k?

C. 20 k?

D. 2 k?

5555. The output power of a transistor amplifier is more than the input power because the additional power is supplied by__________________?
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A. Biasing circuit

B. None of the above

C. Transistor

D. Collector supply VCC
5556. The d.c. load of a transistor amplifier is generally_______________ that of a a.c. load?
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A. None of the above

B. Less than

C. More than

D. The same as

5557. The phase difference between the output and input voltages of a CE amplifier is _____________?
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A. 180o

B. 0o

C. 90o

D. 270o

5558. In a CE amplifier, the phase difference between voltage across collector load RC and signal voltage is _________________?
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A. 270o

B. 180o

C. 90o

D. 0o
5559. If RC and RL represent the collector resistance and load resistance respectively in a single stage transistor amplifier, then a.c. load is____________________?
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A. RC

B. RL + RC

C. RC || RL

D. RL RC

5560. In a single stage transistor amplifier, RC and RL represent collector resistance and load resistance respectively. The transistor sees a d.c. load of _____________________?
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A. RL

B. RC || RL

C. RC

D. RC + RL

5561. It is generally desired that a transistor should have_____________________ input impedance?
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A. Very low

B. High

C. Very high

D. Low

5562. A transistor converts __________________?
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A. c. power into a.c. power

B. c. power into d.c. power

C. high resistance into low resistance

D. none of the above

5563. CC configuration is used for impedance matching because its ________________?
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A. None of the above

B. Input impedance is very high

C. Input impedance is low

D. Output impedance is very low

5564. The value of collector load RC in a transistor amplifier is _______________the output impedance of the transistor?
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A. None of the above

B. Less than

C. The same as

D. More than

5565. The ratio of output impedance of a CE amplifier is _______________?
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A. High

B. Low

C. About 1

D. Moderate
5566. In transistor amplifiers, we generally use______________ capacitors?
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A. Electrolytic

B. Mica

C. Paper

D. Air

5567. A transistor amplifier has high output impedance because ______________?
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A. Emitter is heavily doped

B. Collector has reverse bias

C. None of the above

D. Collector is wider than emitter or base

5568. If the power and current gains of a transistor amplifier are 16500 and 100 respectively, then voltage gain is_____________________?
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A. 165 x 104

B. 100

C. 165

D. None of the above

5569. When an a.c. signal is applied to an amplifier, ,the operating point moves along_________________?
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A. c. load line

B. c. load line

C. both d.c. and a.c. load lines

D. none of the above

5570. An amplifier has a power gain of 100. Its db gain is ________________?
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A. 10 db

B. 20 db

C. None of the above

D. 40 db

5571. In a CE amplifier, voltage gain =____________________ x RAC/Rin?
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A. (1 + ?)

B. (1+ ?)

C. ?

D. ?

5572. The purpose of emitter capacitor (i.e. capacitor across RE) is to ______________?
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A. Avoid voltage gain drop

B. Reduce noise in the amplifier

C. Forward bias the emitter

D. None of the above

5573. The point of intersection of d.c. and a.c. load lines is called________________?
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A. Operating point

B. Saturation point

C. Cut off point

D. None of the above

5574. For highest power gain, one would use _________________configuration?
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A. CC

B. CE

C. CB

D. none of the above

5575. The slope of a.c. load line is ______________ that of d.c. load line?
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A. The same as

B. Less than

C. More than

D. None of the above

5576. The radio wave picked up by the receiving antenna is amplified about _________________ times to have reasonable sound output?
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A. A million

B. 10000

C. 100

D. 1000

5577. A CE amplifier is also called _______________ circuit?
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A. None of the above

B. Grounded collector

C. Grounded base

D. Grounded emitter
5578. In the d.c. equivalent circuit of a transistor amplifier, the capacitors are considered__________________?
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A. None of the above

B. Short

C. Open

D. Partially short

5579. When a transistor amplifier is operating, the current in any branch is _______________?
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A. c. only

B. Sum of a.c. and d.c.

C. difference of a.c. and d.c.

D. c. only

5580. In order to get more voltage gain from a transistor amplifier, the transistor used should have_________________?
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A. Wide emitter

B. Thin collector

C. Thin base

D. None of the above

5581. A single stage transistor amplifier contains______________ and associated circuitry?
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A. Three transistor

B. Two transistors

C. One transistor

D. None of the above

5582. If the input capacitor of a transistor amplifier is short-circuited, then_________________?
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A. Biasing conditions will change

B. Transistor will be destroyed

C. Signal will not reach the base

D. None of the above

5583. If a transistor amplifier feeds a load of low resistance (e.g. speaker), then voltage gain will be_______________?
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A. Low

B. High

C. Very high

D. Moderate

5584. When two D.C. series motors are connected in parallel, the resultant speed is____________?
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A. more than the normal speed

B. normal speed

C. zero

D. loss than the normal speed

5585. For starting a D.C. motor a starter is required because___________?
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A. it starts the motor

B. it limits the speed of the motor

C. none of the above

D. it limits the starting current to a safe value
5586. Which D.C. motor is preferred for elevators ?
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A. Cumulative compound motor

B. Series motor

C. Differential compound motor

D. Shunt motor

5587. The size of poxvirus is_______________?
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A. 250 nm

B. 200 nm

C. 20 nm

D. 300 nm
5588. The type of D.C. motor used for shears and punches is_____________?
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A. differential compoutid D.C. motor

B. cumulative compound D.C. motor

C. series motor

D. shunt motor

5589. If a D.C. motor is to be selected for conveyors, which rriotor would be preferred ?
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A. Shunt motor

B. Differentially compound motor

C. Series motor

D. Cumulative compound motor

5590. Kingdom Protoctista includes_______________?
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A. Prokaryotic organisms

B. Fungi

C. Eu-cariotiquic organisms

D. Unicellular organisms
5591. No-load speed of which of the following motor will be highest ?
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A. Differentiate compound motor

B. Shunt motor

C. Series motor

D. Cumulative compound motor

5592. Which D.C. motor will be preferred for machine tools ?
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A. Shunt motor

B. Differential compound motor

C. Series motor

D. Cumulative compound motor

5593. If a D.C. motor is connected across the A.C. supply it will_______________?
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A. run at lower speed

B. burn due to heat produced in the field winding by .eddy currents

C. not run

D. run at normal speed

5594. Which of the following application requires high starting torque ?
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A. Air blower

B. Locomotive

C. Lathe machine

D. Centrifugal pump

5595. Differentially compound D.C. motors can find applications requiring___________?
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A. high starting torque

B. frequent on-off cycles

C. low starting torque

D. variable speed

5596. To get the speed of D.C, motor below the normal without wastage of electrical energy is used?
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A. Ward Leonard control

B. none of the above method

C. rheostatic control

D. any of the above method

5597. According to Flemings left-hand rule, when the forefinger points in the direction of the field or flux, the middle finger will point in the direction of_________________?
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A. none of the above

B. current in the conductor aovtaat of conductor

C. resultant force on conductor

5598. The direction of rotation of a D.C. series motor can be changed by___________?
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A. either of A. and B. above

B. None of the above

C. interchanging field terminals

D. interchanging supply terminals

5599. A D.C. series motor is that which______________?
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A. can be started easily without load

B. has its field winding consisting of thick wire and less turns

C. has almost constant speed

D. has a poor torque

5600. If the field of a D.C. shunt motor gets opened while motor is running______________?
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A. the motor will continue to nuvat constant speed

B. the armature current will reduce

C. the speed of motor will be reduced %

D. the motor will attain dangerously high speed 1