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Doctors Medicines MCQs Q&A

  1. 0.10, 0 .15
  2. 0.15, 0.35
  3. 0.30, 0.10
  4. 0.35, 0.15 
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1 Answers

Option 2 : 0.15, 0.35

Explanation:

  • The longitudinal friction on the highway for calculation of stopping distance in geometrical design is 0.35 to 0.40.
  • Recommended value of the lateral friction coefficient by the Indian Road Congress is 0.15.

Two types of friction generally considered in highway design are as follows:

1. Lateral/Side/Traverse friction: It acts to counter the centrifugal force acting on the tyre in the lateral direction.

Recommended value of lateral friction coefficient by the Indian Road Congress is 0.15.

However, in the case of expressways, it can be reduced even to 0.1 with a design speed of 120 kmph.

2. Longitudinal/Rolling friction: It acts in the rolling direction of tyres of the vehicle.

Recommended value of longitudinal friction by Indian Road Congress are as follows:

V (kmph)

≤ 30

40

50

60

≥ 80

f

0.40

0.38

0.37

0.36

0.35
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Consider the following solution to the producer-consumer synchronization problem. The shared buffer size is . Three semaphores empty, full and mutex are defined with respective initial values of 0, and 1. Semaphore empty denotes the number of available slots in the buffer, for the consumer to read from. Semaphore denotes the number of available slots in the buffer, for the producer to write to. The placeholder variables, denoted by P, Q, R, and S, in the code below can be assigned either empty or full. The valid semaphore operations are: wait ( ) and signal ( ). Producer: Consumer: do {         wait (P) ;         wait (mutex) ;         //Add item to buffer         signal (mutex) ;         signal (Q) ; } while (1) ; do {          wait (R) ;          wait (mutex) ;          //Consume item from buffer          signal (mutex) ;          signal (S) ; } while (1) ;   Which one of the following assignments to P, Q, R and S will yield the correct solution?
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