In the bridge shown, Z1 = 300 ohm, Z2 = 400 – j300 ohm, Z3 = 200 + j100 ohm. The Z4 at balance is

When we compare the half bridge converter and full bridge converter 1. The maximum collector current of a full bridge is only double that of the half bridge 2. Full bridge uses 4-power switches instead of 2, as in the double bridge. 3. Output power of a full bridge is twice that of a half bridge with the same input voltage and current. When of the above statements are correct?

A

1, 2 and 3

B

1 and 2 only

C

1 and 3 only

D

2 and 3 only

Four friends A, B, C and D need to cross a bridge. A maximum two persons can cross it at a time. It is night and they just have one lamp. Persons that cross the bridge must carry the lamp to find the way. A pair must walk together at the speed of slower person. After crossing the bridge, the person having faster speed in the pair will return with the lamp each time to accompany another person in the group. Finally, the lamp has to be returned at the original place and the person who returns the lamp has to cross the bridge again without lamp. To cross the bridge, the time taken by them is as follows: A :1 minute, B : 2 minutes, C : 7 minutes and D : 10 minutes. What is the total minimum time required by all the friends to cross the bridge?

A

23 minutes

B

22 minutes

C

21 minutes

D

20 minutes

A boat is on the one side of a bridge and the other boat is on the other side of the bridge. The bridge is 36 meter above the river surface. The angles of depression of both the boats from the bridge point on the bridge are complementary to each other and the angle of depression of first boat from the bridge is tan-1(1/3), then what is the distance between both the boats?

A

100 meters

B

110 meters

C

120 meters

D

130 meters

A cow was standing on a bridge, 5m away from the middle of the bridge. A train was coming towards the bridge from the ends nearest to the cow. Seeing this cow ran towards the the train and managed to escape when the train was 2m away from bridge. If it had run in the opposite direction, it would hit by the train 2m before the end of the bridge. What is the lenght of the bridge in meters assuming the speed of the train is 4 times that of cow ?

A

22 mts

B

28 mts

C

32 mts

D

34 mts

Rashna Company collected the following data in its accounting records in 2014 : From the income statement : Depreciation expense Tk. 1,000 Loss on sale of equipment 3,000 From the comparative balance sheet : Beginning balance , equipment Tk. 12,500 Ending balance , equipment 8,000 Beginning balance , accumulated depreciation 2,000 Ending balance , accumulated depreciation 2,400 No new equipment was purchased during the year. The equipment was sold at the end of the year. What was the cash in -flow from the sale of equipment in 2014?

A

Tk, 3,900

B

Tk. 1,000

C

Tk. 900

D

Tk. 600

In the Owen’s bridge shown in below figure, Z1 = 200∠60°, Z2 = 400∠-90°, Z3 = 300∠0°, Z4 = 400∠30°. Then the _______

A

Bridge is balanced with given impedance values

B

Bridge can be balanced, if Z4 = 600∠60°

C

Bridge can be balanced, if Z3 = 400∠0°

D

Bridge cannot be balanced with the given configuration

In the Owen’s bridge shown in below figure, Z1 = 200∠60°, Z2 = 400∠-90°, Z3 = 300∠0°, Z4 = 400∠30°. Then,

A

Bridge is balanced with given impedance values

B

Bridge can be balanced, if Z4 = 600∠60°

C

Bridge can be balanced, if Z3 = 400∠0°

D

Bridge cannot be balanced with the given configuration

A train of length 400 m is crossing a river bridge with the speed of 10 m / sec and a boat is also crossing the river, which is just below the bridge. The length of the bridge is 200 m and the length of the boat is 20 m, what should be the speed of the boat so that both will reach to the other side of the river at the same time (consider the boat is travelling in still water)?

A

3.67 m / sec

B

4.56 m / sec

C

2.47 m / sec

D

5.67 m / sec

E

None of these

Study the following table and answer the question: Number of student Appeared (A) and Passed (P) in an annual examination from schools Q, R, S & T in five years (2014 to 2018) Year Schools Q R S T A P A P A P A P 2014 320 240 400 340 420 273 250 225 2015 400 320 380 285 350 280 300 228 2016 440 286 360 288 330 264 320 256 2017 350 252 420 294 380 247 350 315 2018 375 320 450 405 400 344 375 300 The total number of students passed from school Q in 2014 and 2018 is what percent less than the total number of students appeared from school R and S in 2017?

A

35.4%

B

30%

C

25%

D

42.9%

Study the following table and answer the question: Number of students Appeared (A) and Passed (P) in an annual examination from four schools Q, R. S & T in five years (2014 to 2018) Year Schools Q R S T A P A P A P A P 2014 320 240 400 340 420 273 250 225 2015 400 320 380 285 350 280 300 228 2016 440 286 360 288 330 264 320 256 2017 350 252 420 294 380 247 350 315 2018 375 320 450 405 400 344 375 300 The total number of students passed from school S in 2014 and 2017 is what percent of 90% of the total number of students appeared from school T in 2015, 2016 and 2017? (correct to one decimal place)

A

53.9

B

59.6

C

54.8

D

57.4

In the bridge shown, Z1 = 300 ohm, Z2 = 400 – j300 ohm, Z3 = 200 + j100 ohm. The Z4 at balance is

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