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
6101. Conductance is analogous to_____________?
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A. reluctance

B. permeance

C. inductance

D. flux

6102. When both the inductance and resistance of a coil are doubled the value of________________?
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A. time constant is halved

B. time constant remains unchanged

C. final steady current is doubled

D. initial rate of rise of current is doubled

6103. Energy stored by a coil is doubled when its current is increased by percent___________?
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A. 41.4

B. 100

C. 50

D. 25

6104. Relative permeability of vacuum is__________?
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A. 4n x 10- H/m

B. 1

C. 1/4JI

D. 1 H/m

6105. In a magnetic material hysteresis loss takes place primarily due to___________?
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A. molecular friction

B. rapid reversals of its magnetisation

C. it high retentivity

D. flux density lagging behind magnetising force

6106. Silicon steel is used in electrical machines because it has_____________?
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A. low coercivity

B. low retentivity

C. high coercivity

D. low hysteresis loss
6107. The property of a material which opposes the creation of magnetic flux in it is known as_____________?
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A. reluctivity

B. permeance

C. reluctance

D. magnetomotive force

6108. The initial rate of rise of current through a coil of inductance 10 H when suddenly connected to a D.C. supply of 200 V is__________Vs
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A. 50

B. 20

C. 500

D. 0.05

6109. Those magnetic materials are best suited for making armature and transformer cores which have ________ permeability and ________ hystersis loss
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A. low, low

B. low, high

C. high, low

D. high, high

6110. While comparing magnetic and electric circuits, the flux of magnetic circuit is compared with which parameter of electrical circuit ?
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A. E.m.f.

B. Conductivity

C. Current density

D. Current
6111. The relative permeability of a ferromagnetic material is_____________?
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A. more than 100 or 1000

B. less than one

C. more than 10

D. more than one

6112. Those materials are well suited for making permanent magnets which have ________ retentivity and _________ coercivity
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A. high, high

B. low, low

C. low, high

D. high, low

6113. The unit of reluctance is_____________?
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A. metre/henry

B. 1/henry

C. henry/metre

D. henry

6114. Point out the wrong statement. Magnetic leakage is undesirable in electric machines because it___________?
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A. produces fringing

B. leads to their increased weight

C. lowers their power efficiency

D. increases their cost of manufacture

6115. Permeability in a magnetic circuit corresponds to________ in an electric circuit
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A. resistance

B. conductivity

C. resistivity

D. conductance

6116. A ferrite core has less eddy current loss than an iron core because_______________?
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A. ferrites are magnetic

B. ferrites have high resistance

C. ferrites have high hysteresis

D. ferrites have low permeability

6117. Hard steel is suitable for making permanent magnets because_____________?
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A. it has good residual magnetism

B. its mechanical strength is high

C. its hysteresis loop has large area

D. its mechanical strength is low

6118. Conductivity is analogous to____________?
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A. resistivity

B. permeability

C. inductance

D. retentivity

6119. Permanent magnets are normally made of_____________?
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A. alnico alloys

B. aluminium

C. wrought iron

D. cast iron

6120. Reciprocal of reluctance is_______________?
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A. reluctivity

B. permeance

C. permeability

D. susceptibility

6121. A car is raining at a constant speed of 50 km/h, which of the following is the feedback element for the driver ?
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A. Eyes

B. Clutch

C. None of the above

D. Steering wheel

E. Needle of the speedometer
6122. The capacitance, in force-current analogy, is analogous to_____________?
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A. displacement

B. momentum

C. velocity

D. mass
6123. Spring constant in force-voltage analogy is analogous to_____________?
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A. current

B. reciprocal of capacitance

C. resistance

D. capacitance

6124. increases the steady state accuracy?
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A. Integrator

B. Phase lead compensator

C. Phase lag compensator

D. Differentiator

6125. ______________By which of the following the system response can be tested better ?
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A. Sinusoidal input signal

B. Unit impulse input signal

C. Exponentially decaying signal

D. Ramp input signal

6126. Which of the following is an electromagnetically device ?
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A. LVDT

B. Induction relay

C. Thermocouple

D. None of the above

E. Any of the above

6127. A controller, essentially, is a________________?
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A. clipper

B. amplifier

C. comparator

D. sensor

6128. Which of the following should be done to make an unstable system stable ?
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A. The gain of the system should be decreased

B. The number of zeros to the loop transfer function should be increased

C. The number of poles to the loop transfer function should be increased

D. The gain of the system should be increased
6129. Which of the following can be measured by LVDT ?
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A. Displacement

B. Acceleration

C. Any of the above

D. Velocity

6130. An automatic toaster is a ___________ loop control system?
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A. open

B. closed

C. partially closed

D. any of the above

6131. If the gain of the critical damped system is increased it will behave as______________?
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A. underdamped

B. oscillatory

C. critically damped

D. none of the above

E. overdamped

6132. Which of the following is an open loop control system ?
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A. Field controlled D.C. motor

B. Ward leonard control

C. Stroboscope

D. Metadyne

6133. The first order control system, which is well designed, has a_______________?
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A. small bandwidth

B. none of the above

C. negative time constant

D. large negative transfer function pole
6134. Due to which of the following reasons excessive bond width in control systems should be avoided ?
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A. Noise is proportional to band width

B. None of the above

C. It leads to low relative stability

D. It leads to slow speed of response

6135. A good control system has all the following features except_____________?
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A. sufficient power handling capacity

B. good stability

C. slow response

D. good accuracy

6136. In open loop system_____________?
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A. the control action is independent of the output

B. the control action depends on system variables

C. the control action depends on the size of the system

D. the control action depends on the input signal

6137. With feedback __________ increases?
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A. gain

B. effects of disturbing signals

C. sensitivity

D. system stability
6138. ___________From which of the following transfer function can be obtained ?
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A. Output-input ratio

B. Signal flow graph

C. Standard block system

D. Analogous table

E. None of the above

6139. The viscous friction co-efficient, in force-voltage analogy, is analogous to______________?
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A. charge

B. reciprocal of inductance

C. resistance

D. none of the above

E. reciprocal of conductance

6140. has tendency to oscillate______________?
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A. Open loop system

B. Closed loop system

C. Both A. and B.

D. Neither A. nor B.

6141. The transient response, with feedback system_____________?
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A. rises quickly

B. decays slowly

C. rises slowly

D. decays quickly
6142. A closed loop system is distinguished from open loop system by which of the following ?
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A. Input pattern

B. Servomechanism

C. Feedback

D. Output pattern

6143. Which of the following is the output of a thermocouple ?
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A. Direct current

B. Alternating current

C. A.C. voltage

D. None of the above

E. D.C. voltage
6144. When the initial conditions of a system are specified to be zero it implies that the system is________________?
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A. working normally with zero reference input

B. at rest without any energy stored in it

C. working normally with reference input

D. at rest but stores energy
6145. Which of the following statements is correct for any closed loop system ?
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A. Only one of the static error co-efficients has a finite non-zero value

B. All the co-efficients can have zero value

C. All the co-efficients are always non-zero

D. None of the above

6146. The transfer function technique is considered as inadequate under which of the following conditions ?
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A. Systems having multiple input disturbances

B. Systems having stability problems

C. Systems having complexities and non-linearities

D. All of the above
6147. A.C. servomotor resembles_____________?
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A. universal motor

B. two phase induction motor

C. Three phase induction motor

D. direct current series motor

6148. The temperature, under thermal and electrical system analogy, is considered analogous to_______________?
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A. charge

B. voltage

C. none of the above

D. capacitance

E. current

6149. Which of the following is the best method for determining the stability and transient response ?
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A. None of the above

B. Nyquist plot

C. Bode plot

D. Root locus
6150. Which of the following is the non-linearity caused by servomotor ?
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A. Saturation

B. Backlash

C. None of the above

D. Static friction