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
3101. In an Anderson bridge, the unknown inductance is measured in terms of_______________?
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A. known inductance and resistance

B. known capacitance and resistance

C. known inductance

D. known resistance

3102. In pneumatic control systems the control valve used as final control element converts____________?
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A. none of the above

B. pressure signal to electric signal

C. position change to pressure signal

D. electric signal to pressure signal

E. pressure signal to position change
3103. In an AC. co-ordinate potentiometer, the currents in the phase and quadrature potentiometer are adjusted to be_____________?
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A. out of phase by 30

B. out of phase by 60

C. out of phase by 0

D. out of phase by 180

E. out of phase by 90
3104. In order to achieve high accuracy, the slide wire of a potentiometer should be_______________?
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A. neither too small not too large

B. as short as possible

C. as long as possible

D. very thick

3105. Which of the following is the voltage for single phase A.C. system ?
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A. 22 V

B. 15 kV

C. 5 kV

D. None of the above

E. 440 V

3106. If the gain of the critical damped system is increased it will behave as______________?
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A. overdamped

B. underdamped

C. critically damped

D. none of the above

E. oscillatory

3107. Volt box is a component to_____________?
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A. measure voltage

B. extend voltage range

C. compare voltage in a box

D. none of the above

3108. A CRO is used to measure _________________?
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A. All of above

B. Voltage

C. Frequency

D. Phase

3109. 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

B. (n-1)G

C. G/(n-1)

D. nG

3110. A phase lag lead network introduces in the output_______________?
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A. none of the above

B. lag at high frequencies and lead at low frequencies

C. lag at low frequencies and lead at high frequencies

D. lag at all frequencies

3111. Which of the following instruments indicate the instantaneous value of the electrical quantity being measured at the time at which it is being measured ?
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A. Integrating instruments

B. Recording instruments

C. Absolute instruments

D. Indicating instruments
3112. A.C. servomotor is basically a____________?
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A. three phase induction motor

B. two phase induction motor

C. single phase induction motor

D. universal motor

3113. The frequency and time domain are related through which of the following ?
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A. Either B. or C.

B. Laplace Transform and Fourier Integral

C. Laplace Transform

D. Fourier Integral

3114. In a Weston frequency meter, the magnetic axes of the two fixed coils are__________________?
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A. inclined at 120

B. inclined at 60

C. perpendicular

D. parallel

3115. is an instrument which measures the insulation resistance of an electric circuit relative to earth and one another_______________?
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A. Tangent galvanometer

B. Current transformer

C. None of the above

D. Meggar
3116. Any externally introduced signal affecting the controlled output is called a______________?
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A. feedback

B. stimulus

C. gain control

D. signal

3117. A universal RLC bridge uses_________________?
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A. Any of the above

B. Maxwell Wein bridge for measurement of inductance and modified De Santys bridge for measurement of capacitance

C. Maxwell bridge configuration for measurement of inductance and De Santas bridge for measurement of capacitance

D. Maxwell Wein bridge for measurement of inductance and Wein bridge for measurement of capacitance

3118. When a differential amplifier is operated single-ended, _______________?
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A. the output is grounded

B. one input is grounded and signal is applied to the other

C. both inputs are connected together

D. the output is not inverted

3119. Which of the following devices are commonly used as error detectors in instruments ?
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A. Resolvers

B. Vernistats

C. Any of the above

D. Microsyns

3120. Operating torques in analogue instruments are_______________?
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A. deflecting and control

B. vibration and balancing

C. deflecting and damping

D. deflecting, control and damping
3121. Which of the following is measured by using a vector voltmeter ?
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A. Filler transfer functions

B. Amplifier gain and phase shift

C. Complex insersion loss

D. All of the above
3122. 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 reference input

B. at rest without any energy stored in it

C. working normally with zero reference input

D. at rest but stores energy
3123. A dynamometer wattmeter can be used for______________?
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A. both D.C. and A.C.

B. D.C. only

C. A.C. only

D. any of the above

3124. An increase in gain, in most systems, leads to_____________?
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A. constant damping ratio

B. larger damping ratio

C. smaller damping ratio

D. none of the above

3125. The power factor of a single phase load can be calculated if the instruments available are_____________?
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A. one voltmeter and one ammeter

B. one voltmeter, one ammeter and one energy meter

C. any of the above

D. one voltmeter, one ammeter and one wattmeter
3126. Which of the following is an open loop control system ?
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A. Stroboscope

B. Ward leonard control

C. Field controlled D.C. motor

D. Metadyne

3127. To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken_______________?
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A. from a source which is not the same as the unknown voltage

B. from the same source as the unknown voltage

C. any of the above

D. from a battery

3128. A controller, essentially, is a________________?
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A. comparator

B. sensor

C. amplifier

D. clipper

3129. On which of the following factors does the sensitivity of a closed loop system to gain changes and load disturbances depend ?
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A. All of the above

B. Forward gain

C. Frequency

D. Loop gain

3130. The capacitance, in force-current analogy, is analogous to_____________?
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A. displacement

B. mass

C. momentum

D. velocity

3131. With zero volts on both inputs, an OP-amp ideally should have an output _______________?
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A. equal to the negative supply voltage

B. equal to zero

C. equal to the positive supply voltage

D. equal to CMRR

3132. Which of the following is an essential part of a motor meter ?
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A. Revolution registering device

B. All of the above

C. A braking device

D. An operating torque system

3133. Wagner earthing device is used to eliminate errors due to________________?
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A. electrostatic coupling

B. electromagnetic coupling

C. both A. and B.

D. none of the above

3134. In force-voltage analogy, velocity is analogous to______________?
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A. capacitance

B. current

C. inductance

D. charge

3135. In a single phase power factor meter the phase difference between the currents in the two pressure coils is___________________?
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A. approximately 0

B. exactly 90

C. approximately 90

D. exactly 0

3136. In an automatic control system which of the following elements is not used ?
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A. Sensor

B. Oscillator

C. Final control element

D. Error detector

3137. Which of the following is an electromagnetically device ?
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A. LVDT

B. Induction relay

C. None of the above

D. Any of the above

E. Thermocouple

3138. The input impedance of a differential amplifier equals re times________________?
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A. RC

B. 2

D. RE

3139. Which of the following can be measured by LVDT ?
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A. Displacement

B. Velocity

C. Any of the above

D. Acceleration

3140. By which of the following the control action is determined when a man walks along a path ?
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A. Eyes

B. Hands

C. Legs

D. Brain

3141. In a low power factor wattmeter the compensating coil is connected_______________?
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A. in series with current coil

B. in series with pressure coil

C. in parallel with current coil

D. in parallel with pressure coil

3142. ______________By which of the following the system response can be tested better ?
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A. Sinusoidal input signal

B. Ramp input signal

C. Exponentially decaying signal

D. Unit impulse input signal
3143. A moving-coil permanent-magnet instrument can be used as flux-meter_____________?
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A. by eliminating the control springs

B. by using a low resistance shunt

C. by making control springs of large moment of inertia

D. by using a high series resistance

3144. In a meggar controlling torque is provided by______________?
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A. coil

B. spring

C. gravity

D. eddy current

3145. In a 3-phase power measurement by two wattmeter method the reading of one of the wattmeter was zero. The power factor of the load must be_______________?
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A. unity

B. zero

C. 0.3

D. 0.5
3146. The effect of error damping is to______________?
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A. delay the response

B. any of the above

C. provide larger settling lime

D. reduce steady state error

E. none of the above

3147. If an inductance is connected in one arm of bridge and resistances in the remaining three arms____________?
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A. the bridge cannot be balanced

B. the bridge can be balanced if the resistances have some specific values

C. the bridge can always be balanced

3148. Static error coefficients are used as a measure of the effectiveness of closed loop systems for specified ___________ input signal?
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A. position

B. acceleration

C. velocity

D. all of the above
3149. The input offset current equals the_____________?
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A. difference between two base currents

B. average of two base currents

C. none of these

D. collector current divided by current gain

3150. The overall efficiency of steam locomotive is around_____________?
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A. 15 to 20 percent

B. 25 to 35 percent

C. 5 to 10 percent

D. 35 to 45 percent