The usual values of maximum flux densities for distribution transformers using hot rolled silicon steel are

In transformers using hot rolled steel, the cross-section of the yoke is made about _____ greater than that of the core

A

5 percent

B

10 percent

C

15 percent

D

30 percent

E

none of the above

By walking at 3/4 of his usual speed, a man reaches his office 20 minutes later than usual. His usual time is :

A

30 minutes

B

75 minutes

C

45 minutes

D

60 minutes

The permissible flux density in case of cold rolled grain oriented steel is around

A

1.7 Wb/m²

B

2.7 Wb/m²

C

3.7 Wb/m²

D

4.7 Wb/m²

Silicon percentage in silicon steel used for electrical equipments is about

A

1

B

4.0

C

8

D

14

Silicon percentage in the silicon steel used for electrical appliances/equipments is

A

0.3-0.4

B

12-14

C

3-4

D

20-25

The probability of rolling any number of an wighted 6-sided die, with faces numbered 1 through 6, is directly proportional to the number rolled. What is the probability of getting 5, if the die is rolled only once?

A

1/6

B

5/6

C

5/16

D

5/21

The probability of rolling any number on a weight 6-sided die, with faces number 1 through 6, is directly proportional to the number rolled. What is the probability of getting 5, if the die is rolled only once?

A

1/6

B

5/6

C

5/16

D

5/21

A die is rolled and a coin is tossed What is the probability that a 3 will be rolled and a tail tossed?

A

1/2

B

1/6

C

1/8

D

1/12

Two transformers are connected in parallel. These transformers do not have equal percentage impedance. This is likely to result in

A

short-circuiting of the secondaries

B

power factor of one of the transformers is leading while that of the other lagging

C

transformers having higher copper losses will have negligible core losses

D

loading of the transformers not in proportion to their kVA ratings

The forced oil and air circulation method is usual one for transformers of capacities

A

upto 5 MVA

B

upto 10 MVA

C

upto 20 MVA

D

30 MVA upwards

The usual values of maximum flux densities for distribution transformers using hot rolled silicon steel are

Related Questions