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Electrical Engineering Objective Questions { Complex AC }



43. If a phasor is multiplied by j, then
A. only its magnitude changes
B. only its direction changes
C. both magnitude and direction change
D. none of the above
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44.  A phasor 2 L180? can be expressed as
A. j2
B.?j2
C. ?2
D.2
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45. The difference of two conjugate numbers results in
A. a complex number
B. in-phase component only
C. quadrature component only
D. none of the above
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46. The two complex number are given as : 5(cos30? +j sin30?); 10(cosI5? + j sin15?) The value of product of these two numbers is equal to
A. 50 (cos 45? + j sin 45?)
B. 50 (cos 150 +j sin 15?)
C. 50 (cos 450? +j sin 450?)
D. none of the above
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47.  In polar form, conductance will be written as
A. RZO?
B. ?R L90?
C. RZ90?
D. ?R LO?
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48.  If the admittance of a parallel a.c. circuit is increased, the circuit current
A. remains constant
B. is decreased
C. is increased
D. none of the above
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49.  The conductance and susceptance components of admittance are
A. series elements
B. parallel elements
C. series parallel elements
D. none of the above
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