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        (d) ABCD

1432

Q.49:- The fifth harmonic component of the induced voltage in 3-phase ac generator can be entirely eliminated by using a winding pitch of

(a) 2 / 3(b) 4 / 5(c) 5 / 6(d)

Q.50:- Consider the following drive systems:

1.

Chopper fed dc series motor

2.

Chopper fed dc shunt motor

3.

Chopper fed permanent magnet dc motor

4.

Brushless dc motor drive

5.

Inverter fed 3-phase induction motor

6.

Inverter fed 3-phase synchronous motor

For the development of a battery operated electric car the possible options are

(a)

1 , 3 and 5

(b)

2 , 4 and 6

(c)

1 and 5

(d)

1 , 4 and 5

Solution

1:- (c) Let the materials be in the ratio of k = x / y

  =   0.002

  =   0.002

  =   0.002

0.004k + 0.000    = 0.002

0.002k = 0.0018

  =  

Hence, the materials should be in the ratio 9:10.

2:- (d) E / H =  the characteristic impedance of the medium.

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