For any system of coplaner forces, the condition of equilibrium is that the alge

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Question
For any system of coplaner forces, the condition of equilibrium is that the
Options
A. algebraic sum of the horizontal components of all the forces should be zero
B. algebraic sum of the vertical components of all the forces should be zero
C. algebraic sum of moments of all the forces about any point should be zero
D. all of the above

Correct Answer

all of the above

More questions

1. The by-pass factor, in case of sensible cooling of air, is given by (where t_d1 = Dry bulb temperature of air entering the cooling coil, t_d2 = Dry bulb temperature of air leaving the cooling coil, and t_d3 = Dry bulb temperature of the cooling coil)
Options
A.
B.
C.
D.

3. If the valve clearances are excessively large, the problem that can arise is
Options
A. overheating of the engine
B. incomplete valve closure
C. fouling of spark plug by gasoline
D. none of these

7. A perfect black body is one which
Options
A. is black in colour
B. absorbs heat radiations of all wave lengths falling on it
C. reflects all the heat radiations
D. transmits the heat radiations

8. Body centred cubic space lattice is found in
Options
A. zinc, magnesinm, cobalt, cadmium, antimony and bismuth
B. gamma-iron, aluminium, copper, lead, silver and nickel
C. alpha-iron, tungsten, chromium and molybdenum
D. none of the above

9. Which of the following statement is wrong?
Options
A. The performance of the vapour compression refrigerator varies considerably with both vaporising and condensing temperatures.
B. In vapour compression cycle, the useful part of the heat transfer is at the condenser.
C. In ammonia-hydrogen (electolux) refrigerator, no compressor, pump or fan is required.
D. The effect of under-cooling the liquid refrigerant is to decrease the coefficient of performance.

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