technical quiz for 3 & 4 years

A machine having an efficiency greater than 50%, is known as

• Reversible machine

• Non-reversible machine

• Neither reversible nor non-reversible machine

• Ideal machine

The correct flow of power through the drive train is

• Engine drive shafts, clutch, main shaft, counter shaft, final driven gear, wheels

• engine clutch, main shaft, counter shaft, final driven gear, drive shafts, wheels

• Engine clutch, counter shaft, main shaft, final driven gear, drive shafts, wheels

• Engine main shaft, counter shaft, clutch, final driven gear, drive shafts, wheels

In centrifugal pumps, maximum efficiency is obtained when the blades are

• Straight

• Bent forward

• Bent backward

• radial

.In an internal combustion engine, the process of removing the burnt gases from the combustion chamber of the engine cylinder is known as

• Scavenging

• Detonation

• Supercharging

• Polymerisation

If petrol is used in a diesel engine, then

• Low power will be produced

• Efficiency will be low

• Higher knocking will occur

• Black smoke will be produced

The pressure at the end of compression, in petrol engines, is approximately

• 10 bar

• 15 bar

• 20 bar

• 25 bar

True stress strain-curve for materials is plotted between

• Load/original cross-sectional area and change in length/original length

• Load/ instantaneous cross-sectional area and loge (original area/ instantaneous area)

• Load/ instantaneous cross-sectional area and change in length/ original length

• Load/ instantaneous area and instantaneous area/original area

The permissible stress for carbon steel under static loading is generally taken as

• 2000-3000 kg/m²

• 3000-4000 kg/cm

• 4000-4500 kg/cm²

• 7500-10,000 kg/cm²

Power of a governor is the

• Mean force exerted at the sleeve for a given percentage change of speed

• Work-done at the sleeve for maximum equilibrium speed

• Mean force exerted at the sleeve for maximum equilibrium speed

• none of the above

A spring used to absorb shocks and vibrations is

• Conical spring

• torsional spring

• leaf spring

• disc spring