# Samsung Papers: Sample Questions 4 - 5 of 15

Examrace Placement Series prepares you for the toughest placement exams to top companies.

## Question number: 4

Short Answer Question▾

### Write in Short

Find out no. of 8′ s preceded by 5 but not just followed by 3 in the series.

215843738526581945826758914583 (2004)

### Explanation

Here, in the given series there are total six 8. But only four of them are preceded by 5 and not followed by 3. One 8 is preceded by 3 and followed by 5 which is not satisfying the given condition and one more 8 is there which is preceded by 8 but followed by 3. So, we need to exclude these two 8. So, there will be only four 8 which are preceded by five and not followed by three.

## Question number: 5

Short Answer Question▾

### Write in Short

What is Umbrella cell?

### Explanation

• A freeway crossing very small cells produces an important number of handovers among the different small neighboring cells. In order to solve this problem, the concept of umbrella cells is introduced. An umbrella cell covers several microcells. The power level inside an umbrella cell is increased comparing to the power levels used in the microcells that form the umbrella cell. When the speed of the mobile is too high, the mobile is handed off to the umbrella cell. The mobile will then stay longer in the same cell (in this case the umbrella cell). This will reduce the number of handovers and the work of the network.
• A too important number of handover demands and the propagation characteristics of a mobile can help to detect its high speed.