Mechanical Engineering Archives

3401. The delay period in compression ignition engines depends upon

temperature and pressure in the cylinder at the time of injection

nature of the fuel mixture strength

relative velocity between the fuel injection and air turbulence pressure of residual gases

all of the above

✅ The correct answer is option D.

3402. In a reaction turbine, when steam flows through the moving blades,

pressure increases while velocity decreases

pressure decreases while velocity increases

pressure and velocity both decreases

pressure and velocity

✅ The correct answer is option C.

3403. The most effective method of controlling S.I. engine exhaust emission is by

recirculating exhaust

using catalytic converter

using some additives in the fuel

none of these

✅ The correct answer is option B.

3404. Two solid shafts ‘A’ and ‘B’ are made of the same material. The shaft ‘A’ is of 50 mm diameter and shaft ‘B’ is of 100 mm diameter. The strength of shaft ‘B’ is __________ as that of shaft A.

one-half

double

four times

eight times

✅ The correct answer is option D.

3405. The lower layer of the beam as shown in the below figure, will be

in tension

in compression

neither in tension nor in compression

✅ The correct answer is option A.

3406. The transfer of heat by molecular collision is known as

conduction

convection

radiation

none of these

✅ The correct answer is option A.

3407. The Young’s modulus of a material is 125 GPa and Poissons ratio is 0.25. The modulus of rigidity of me material is

30 GPa

50 GPa

80 GPa

100 GPa

✅ The correct answer is option B.

3408. Crowning on pulley helps

in decreasing the slip of the belt

in increasing the slip of the belt

to keep the belt in centre on a pulley while it is in motion

to increase pulley lif

✅ The correct answer is option C.

3409. The measurement of a thermodynamic property known as temperature is based on

Zeroth law of thermodynamics

First law of thermodynamics

Second law of thermodynamics

none of these

✅ The correct answer is option A.

3410. The humidification process, on the psychrometric chart is shown by

horizontal line

vertical line

inclined line

curved line

✅ The correct answer is option B.