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
5901. The materil used to coat inside the face of CRT is ______________?
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A. Silicon

B. Carbon

C. Sulphur

D. Phosphorous
5902. If the negative potential on the control grid of CRT is increased, the intensity of spot _____________?
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A. Remains the same

B. Is decreased

C. None of the above

D. Is increased

5903. A galvanometer in series with a high resistance is called_______________?
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A. A voltmeter

B. An ammeter

C. None of the above

D. A wattmeter

5904. A galvanometer of resistance G is shunted by a very small resistance S. The resistance of the resulting ammeter is ______________?
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A. G-S

B. None of the above

C. G+S

D. GS/(G+S)
5905. An ideal ammeter has ______________ resistance?
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A. Infinite

B. High

C. Zero

D. Low

5906. The sensitivity of a multimeter is given in _______________?
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A. O

B. kO/V

C. none of the above

D. Amperes

5907. A voltmeter should have ____________resistance?
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A. Very high

B. Very low

C. Zero

D. None of the above

5908. The horizontal plates of a CRO are supplied with _____________ to observe the waveform of signal?
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A. Cosine wave

B. Sawtooth wave

C. Sinusoidal wave

D. None of the above

5909. For display of signal pattern _____________voltage is applied to the horizontal plates of a CRO?
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A. Sawtooth

B. Rectangular

C. None of the above

D. Sinusoidal

5910. If the full-scale deflection current of a multimeter is 50 A, its sensitivity is ________________?
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A. 50 kO/V

B. 20 kO/V

C. 10 kO/V

D. 100 kO/V

5911. An ammeter has a resistance of G ohms and range of I amperes. The value of resistance required in parallel to convert it into an ammeter of range nI is______________?
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A. G/(n-1)

B. G/n

C. (n-1)G

D. nG

5912. An ammeter is connected in __________ with the circuit element whose current we wish to measure?
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A. None of the above

B. Series

C. Series or parallel

D. Parallel

5913. A VTVM has_____________input resistance than that of a multi meter?
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A. Same

B. None of the above

C. Less

D. More
5914. A CRO is used to measure _________________?
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A. Phase

B. Voltage

C. Frequency

D. All of above
5915. When an ammeter is inserted in the circuit, the circuit current will _____________?
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A. Increase

B. None of the above

C. Remain the same

D. Decrease
5916. To send 10% of the main current through a moving coil galvanometer of resistance 99 O the shunt required is______________?
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A. 100 O

B. 9 O

C. 11 O

D. 9 O

5917. The input resistance of a VTVM is about ______________?
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A. 10 MO

B. 10 kO

C. 1000 O

D. 20 kO

5918. If 2% of the main current is to be passed through a galvanometer of resistance G, then resistance of the shunt required is ________________?
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A. G/50

B. G/49

C. 49 G

D. 50 G

5919. An ammeter should have_____________ resistance?
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A. Very low

B. None of the above

C. Infinite

D. Very large

5920. What is the total resistance of a voltmeter on the 10 V range when the meter movement is rated for 50 A of full-scale current ?
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A. 20 kO

B. 200 kO

C. None of the above

D. 10 kO

5921. A voltmeter is connected in a _____________ with the circuit component across which potential difference is to be measured?
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A. Series or parallel

B. Parallel

C. None of the above

D. Series

5922. If a multimeter has a sensitivity of 1000 O per volt and reads 50 V full scale, its internal resistance is _____________?
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A. 20 kO

B. None of the above

C. 10 kO

D. 50 kO
5923. The sensitivity of a voltmeter which uses a 100 A meter movement is ____________?
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A. 10 kO/V

B. 5 kO/V

C. 1 kO/V

D. Data insufficient

5924. If the field winding of an unloaded salient pole synchronous motor is open circuited, the motor will__________?
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A. stop

B. function as static condenser

C. run as induction motor

D. burn with dense smoke

5925. The construction of a synchronous motor resembles____________?
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A. a series motor

B. an alternator

C. an induction motor

D. a rotary converter

5926. The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as___________?
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A. pull-in torque

B. pull-out torque

C. none of the above

D. pull-up torque

5927. If the synchronous motor, properly synchronised to the supply is running on no load and is having negligible loss then_____________?
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A. the stator current will be very small

B. the stator current will be very high

C. none of the above

D. the stator current will be zero

E. the back e.m.f. will be more than the supply voltage

5928. The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor, at rated stator supply voltage and frequency, is known as__________?
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A. reluctance torque

B. pull up torque

C. locked-rotor torque

D. synchronous torque

5929. For power factor correction, synchronous motors operate at____________?
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A. no-load and greatly over-excited fields

B. no-load and under-excited fields

C. normal load with minimum excitation

D. normal load with zero excitation

5930. The coupling angle or load angle of synchronous motor is defined as the angle between the__________?
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A. rotor and the stator poles of the same polarity

B. none of the above

C. rotor and the stator poles of opposite polarity

D. rotor and stator teeth

5931. In a synchronous motor, the breakdown torque is__________?
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A. inversely proportional to applied voltage

B. directly proportional to the square of the applied voltage

C. none of the above

D. directly proportional to applied voltage
5932. A synchronous motor which works on a leading power factor and does not drive a mechanical load is called as_________?
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A. condenser

B. static condenser

C. none of the above

D. synchronous condenser
5933. A synchronous motor can develop synchronous torque:
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A. below or above synchronous speed

B. only at synchronous speed

C. while over-excited

D. when under loaded

5934. The maximum power developed in a synchronous motor will depend on__________?
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A. the rotor excitation, supply voltage and maximum value of coupling angle (90)

B. the rotor excitation and supply volt-age both

C. the supply voltage only

D. the rotor excitation only

E. none of the above

5935. A synchronous machine with low value of short-circuit ratio has___________?
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A. good voltage regulation

B. none of the above

C. high stability limit

D. lower stability limit

E. good speed regulation

5936. Exciters of synchronous machines are______________?
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A. d.c. compound machines

B. any of the above

C. d.c. shunt machines

D. d.c. series machines

5937. The mechanical displacement of the rotor with respect to the stator, in polyphase multipolar synchronous motors running at full load, is of the order of_____________?
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A. five degrees

B. two degrees

C. ten degrees

D. zero degree

5938. In case one phase of a three-phase synchronous motor is short-circuited the motor will____________?
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A. take less than the rated load

B. not start

C. run at 2/3 of synchronous speed

D. run with excessive vibrations

5939. In a synchronous motor, the armature current has large values for____________?
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A. high excitation only

B. low excitation only

C. both high and low excitation

D. none of the above

5940. The armature current of the synchronous motor
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A. has large values for low excitation i niy

B. has large values for high excitation only

C. has large values for low and high excitation

D. any of the above

5941. A pony motor is basically a_________?
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A. D.C. shunt motor

B. small induction motor

C. D.C. series motor

D. double winding A.C./D.C. motor

5942. When the stator windings are connected in such a fashion that the number of poles are made half, the speed of the rotor of a synchronous motor___________?
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A. tends to becomes zero

B. remains same as the original value

C. decreases to half the original value

D. increases to two times the original value
5943. The minimum armature current of the synchronous motor corresponds to operation at______________?
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A. 0.707 power factor leading

B. unity power factor

C. zero power factor leading

D. 0.707 power factor lagging

5944. Slip rings are usually made of__________?
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A. copper or aluminium

B. silver or gold

C. carbon or graphite

D. brass or steel
5945. Synchronous motors are generally not self-starting because:
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A. starting winding is not provided on the machines

B. the direction of rotation is not fixed

C. startes cannot be used on these machines

D. the direction of instantaneous torque reverses after half cycle
5946. The power factor of a synchronous motor is better than that of induction motor because
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A. synchronous motor runs at synchronous speed

B. stator supply is relieved of responsibility of producing magnetic field

C. synchronous motor has large air gap

D. mechanical load on the motor can be adjusted

5947. When the field of a synchronous motor is under-excited, the power factor will be____________?
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A. zero

B. leading

C. lagging

D. unity

5948. Riunting in a synchronous motor takes place___________?
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A. motor is under loaded

B. when load varies

C. when power factor is unity

D. when supply voltage fluctuates

5949. In a synchronous motor, the magnitude of stator back e.m.f. & depends on_______________?
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A. d.c. excitation only

B. speed of the motor

C. load on the motor

D. both the speed and rotor flux

5950. Change of D.C. excitation of a synchronous motor changes:
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A. applied voltage of the motor

B. all of the these

C. none of the these

D. motor speed

E. power factor of power drawn by the motor