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
2101. Overload relays are of_______________type
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A. solid state

B. electromagnetic

C. thermal

D. induction

E. all above
2102. Ferrites are materials
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A. paramagnetic

B. ferromagnetic

C. diamagnetic

D. none of the above

2103. For which of the following ratings of the transformer differential protection is recommended ?
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A. equal to and above 5 MVA

B. none of the above

C. above 30 kVA.

D. equal to and above 25 MVA

2104. A synchronous converter can be started______________?
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A. from D.C. side as D.C. motor

B. none of the above methods

C. by means of a small auxiliary motor

D. from AC. side as induction motor

E. any of the above methods
2105. The materials having low retentivity are suitable for making_____________?
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A. temporary magnets

B. weak magnets

C. none of the above

D. permanent magnets

2106. A differential relay measures the vector difference between_________________?
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A. two or more similar electrical quantities

B. two currents

C. none of the above

D. two voltages

2107. The under voltage relay can be used for______________?
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A. transformers

B. all of the above

C. generators

D. busbars

E. motors

2108. Interruption of large currents by relay requires______________?
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A. all of the above

B. arc suppressing blow out coils

C. high speed opening of contacts

D. wide separation of the opened contacts

2109. For an ideal op-amp, which of the following is true?
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A. The current into the input terminals is zero

B. The output resistance is zero

C. The differential voltage across the input terminals is zero

D. The current from output terminal is zero
2110. Insulation resistance of high voltage circuit breakers is more than________________?
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A. 100 mega ohms

B. 500 mega ohms

C. 10 mega ohms

D. 1 mega ohms

2111. In order that current should flow without causing excessive heating or voltage drop, the relay contacts should_________________?
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A. be of sufficient size and proper shape

B. have low contact resistance

C. be clean and smooth

D. have all above properties
2112. In a mercury pool rectifier, the voltage drop across its electrodes___________?
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A. is almost independent of load current

B. is inversely proportional to load

C. is directly proportional to load

D. varies exponentially with the load current

2113. The unit of flux is the same as that of_______________?
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A. pole strength

B. permeance

C. reluctance

D. resistance

2114. The current zero interruption, in oil and air blast circuit breakers, is achieved by_______________?
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A. lengthening of the gap

B. cooling and blast effect

C. both A. and B

D. deionizing the oil with forced air

E. none of the above

2115. The steady state stability of the power system can be increased by_____________?
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A. none of the above

B. connecting lines in series

C. connecting lines in parallel

D. using machines of high impedance

E. reducing the excitation of machines

2116. When a magnet is in motion relative to a coil the induced e.m.f. does not depend upon____________?
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A. resistance of the coil

B. motion of the magnet

C. number of turns of the coil

D. pole strength of the magnet

2117. What is the magnitude and the direction of force per 1.1m length of a pair of conductors of a direct current linecarrying 10 amperes and spaced 100 mm apart ?
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A. 22 x 10?5 N

B. 22 x 10?7 N

C. 22 x 10-6 N

D. 22 x 10?8 N

2118. The internal efficiency of a mercury arc rectifier depends on___________?
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A. r.m.s. value of current

B. voltage and current

C. voltage only

D. none of the above

E. current only

2119. The relative permeability of materials is not constant
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A. paramagnetic

B. insulating

C. ferromagnetic

D. diamagnetic

2120. Which of the following circuit breakers has high reliability and minimum maintenance ?
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A. Oil circuit breakers

B. Air blast circuit breakers

C. Vacuum circuit breakers

D. Circuit breaker with SF6 gas
2121. A non inverting closed loop op amp circuit generally has a gain factor______________?
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A. Equal to one

B. Greater than one

C. Of zero

D. Less than one

2122. What will be the reflection co-efficient of the wave of load connected to transmission line if surge impedance of the line is equal to load ?
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A. None of the above

B. Zero

C. Infinity

D. Unity

2123. Normally, which of the following is used, when a large-scale conversion from AC. to D.C. power is required ?
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A. Motor converter

B. Motor-generator set

C. Mercury arc rectifier

D. Rotary converter

2124. To produce cathode spot in a mercury arc rectifier______________?
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A. anode is heated

B. low mercury vapour pressures are used

C. an auxiliary electrode is used

D. tube is evacuated

2125. The susceptibility of paramagnetic materials generally lies between____________?
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A. KT3 and 1CT6

B. 10?2 and KT5

C. KT4 and KT8

D. 1CT3 and 1CT7

2126. The magnetic reluctance of a material______________?
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A. increases with increasing cross-sec-tional area of material

B. any of the above

C. decreases with increasing cross sectional area of material

D. does not vary with increasing cross-sectional area of material

2127. Paramagnetic materials have relative permeability________________?
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A. equal to unity

B. slightly less than unity

C. slightly more than unity

D. equal to that ferromagnetic mate rials

2128. The working of a meter is based on the use of a permanent magnet. In order to protect the meter functioning from stray magnetic fields______________?
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A. a soft iron shielding is used

B. a shielding of anon-magnetic material is used

C. a plastic shielding is provided

D. meter is surrounded by strong magnetic fields

2129. For an op-amp having differential gain Av and common-mode gain Ac the CMRR is given by___________?
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A. Av / Ac

B. 1 + Av / AC.

C. Ac / Av

D. Av + Ac

2130. Which of the following mercury arc rectifier will deliver least undulating current?
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A. Six-phase

B. Three-phase

C. Single-phase

D. Two-phase

2131. A permeable substance is one_____________?
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A. which is a strong magnet

B. which is a good conductor

C. through which the magnetic lines of force can pass very easily

D. which is a bad conductor

2132. For cost and safety, the outdoor substations are installed for voltages above_________________?
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A. 33 kV

B. 60kV

C. 110kV

D. 11 kV

2133. The reflection co-efficient at the open circuited end of a transmission line___________?
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A. zero

B. unity

C. none of the above

D. infinity

2134. In which of the following appUcations, direct current is absolutely essential ?
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A. Illumination

B. Traction

C. Electrolysis

D. Variable speed operation

2135. Reciprocal of permeability is____________?
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A. conductance

B. permittivity

C. reluctivity

D. susceptibility

2136. Out of the following statements, concerning an electric field, which statement is not true ?
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A. The electric field intensity at a point is numerically equal to the force exerted upon a charge placed at that point

B. An electric field is defined as a point in space at which an electric charge would experience a force

C. Unit field intensity in the exertion of a force of one newton on a charge of one coulomb

D. The electric intensity is a vector quantity

2137. One maxwell is equal to____________?
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A. 10 webers

B. 10 webers

C. 10 webers

D. 10 webers

2138. An efficient and a well designed protective relaying should have_____________?
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A. all of the above

B. economy and simplicity

C. good selectivity and reliability

D. high speed and selectivity

2139. Which of the following is not a unit of flux?
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A. Weber

B. All of the above

C. Maxwell

D. Telsa
2140. The Biot-savarts law is a general modification of_______________?
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A. Lenzs law

B. Amperes law

C. Kirchhoffs law

D. Faradays laws

2141. An opamp has a slew rate of 5V/ S. the largest sine wave o/p voltage possible at a frequency of 1MHz is____________?
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A. 10 V

B. 5V

C. 5/2 V

D. 5 V

2142. A conductor of length L has current I passing through it, when it is placed parallel to a magnetic field. The force experienced by the conductor will be______________?
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A. BLI

B. zero

C. B2LI

D. BLI2

2143. Magnetic circuit breaker has ___________ trip action
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A. delayed

B. instantaneous

C. both of the above

D. none of the above

2144. Which of the following amplifier is used in a digital to analog converter?
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A. Summer

B. Voltage follower

C. Non inverter

D. Difference amplifier

2145. The fuse rating is expressed in terms of_____________?
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A. VAR

B. kVA

C. current

D. voltage

2146. To reduce short circuit fault currents are used_____________?
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A. reactors

B. capacitors

C. none of the above

D. resistors

2147. Resistance grounding is used for voltage between_________________?
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A. 3.3kVandllkV

B. HkVto33kV

C. none of the above

D. 33kVto66kV

2148. Magnetising steel is normals difficult because____________?
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A. it has low permeability

B. it has high specific gravity

C. it has high permeability

D. it corrodes easily

2149. In a single bus-bar system there will be complete shut down when____________?
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A. fault occurs with respect to earthing

B. two or more faults occur simultaneously

C. fault occurs on neutral line

D. fault occurs on the bus itself
2150. The ratio of intensity of magnetisation to the magnetisation force is known as_____________?
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A. flux density

B. susceptibility

C. none of the above

D. relative permeability