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Electrical Engineering Objective Questions { Utilisation of Electrical Energy }



29. In automobiles, the sound produced by horn is due to
A. magnetostriction
B. vibrating diaphragm
C. moving coil
D. oscillating coil
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30. Continuous operation of automobile horn will
A. help in charging the battery
B. improve mileage
C. damage the operating coil
D. change the tone
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31. Electric braking is preferred because it is
A. smooth
B. maintenance cost is less
C. energy is saved in regenerating broking
D. all of these
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32. The various types of electric braking are
A. plugging
B. rheostatic braking
C. regenerative braking
D. all of these
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33. Motor recommended for locomotive drive is
A. D.C.series motor
B. p.c. shunt motor
C. .C. Compound motor
D. synchronous motor
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34. In case of d.c. series motor it is possible to have finite no load speed if a resistance is connected across its
A. field terminals
B. armature terminals
C. field and armature together
D. it is always very high at no load
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35. During starting, the energy consumed by the armature of a d.c. shunt motor
A. equals the K.E. shored by the rotor and increases with increase in armature resistance.
B. equals the K.E. stored by the rotor and decreases with increase in armature resistance.
C. equals the K.E. stored by the rotor and is independent of armature resistance.
D. none of these
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