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281.

A compressure force in boom in above problem is

A.	1096 kg	B.	693 kg
C.	1390 kg	D.	886 kg

282.

If span is 150 mts and sag is 10 ft of a cable carrying a load of 3200 kg per horizontal metre then tension of ends is

A.	932,000 kg	B.	104,000 kg
C.	1200,000 kg	D.	584,000 kg

283.

A horizontal load of 120 kg/mt is to be carried by a cable suspended between supports at same level and 60 mts apart. If the maximum permissible tension is 36,000 kg the required length of cable is

A.	60.8 mts	B.	60.1 mts
C.	63.3 mets	D.	62.5 mts

284.

The sag in a tape 100 ft long held between two supports 99.8 ft aprat at the same level is

A.	3.32 ft	B.	0.98 ft
C.	1.87 ft	D.	2.73 ft

285.

If the above tape weights 0.001 kg/ft, sag is

A.	2.73 ft	B.	2.90 ft
C.	3.03 ft	D.	3.13 ft

286.

If w is the angular velocity of the pulley and T1 and T2 are tensions of driving and driven side then power transmitted equals

A.	(T1 + T2) w	B.	(T1 - T2) w
C.	wT1	D.	(T1 + 2T2) w

287.

A screw jack has 4 threads per inch. The mean radius of the thread is 2.338 inches. The mean diameter of the bearing surface under the cap is 3.25 inches. What is the turning moment required to raise the bload of 150 kg (

A.	30.3 kg-inch	B.	5.61 kg-inch
C.	23.6 kg-inch	D.	50.6 kg-inch

288.

If four turms of rope around a horizontal post will hold a 100 kg weight with a pull of 1 kg, then

A.	0.3	B.	0.25
C.	0.18	D.	0.11

289.

A plane is inclinea at angle ? to horizontal. If a body can just rest on a plane, determine the least force to draw the body up the plance

A.	2 W cos2?	B.	W cos2?
C.	2 W sin2?	D.	W sin2?

290.

What force is necessary to hold a weight of 100 kg suspended on a rope wrapped 3 times around a post (

A.	1.46	B.	0.35
C.	0.8	D.	2.85