x τ x D3
x τ x D3
x τ x D3
x τ x D3
✅ The correct answer is option B.
Mechanical Engineering MCQs
The silicon carbide abrasive is chiefly used for grinding
cemented carbide
ceramic
cast iron
all of these
✅ The correct answer is option D.
The processes occuring in open system which permit the transfer of mass to and from the system, are known as
flow processes
non-flow processes
adiabatic processes
none of these
✅ The correct answer is option A.
The efficiency of Stirling cycle is __________ Carnot cycle.
greater than
less than
equal to
✅ The correct answer is option C.
Two closely coiled helical springs ‘A’ and ‘B’ are equal in all respects but the number of turns of spring ‘A’ is half that of spring ‘B’ The ratio of deflections in spring ‘A’ to spring ‘B’ is
1-Aug
1-Apr
1-Feb
2
✅ The correct answer is option C.
When the back pressure of a nozzle is below the designed value of pressure at exit of nozzle, the nozzle is said to be
choked
underdamping
overdamping
none of these
✅ The correct answer is option B.
Iron-carbon alloys containing 1.7 to 4.3% carbon are known as
eutectic cast irons
hypo-eutectic cast irons
hyper-eutectic cast irons
none of these
✅ The correct answer is option B.
The percentage of carbon in cast iron varies from
0.1 to 0.5
0.5 to 1
1 to 1.7
1.7 to 4.5
✅ The correct answer is option D.
The information provided by the oxygen (O2) sensor to the feedback control system is about the
air-fuel ratio
air temperature
air flow speed
exhaust gas volume
✅ The correct answer is option A.
The efficiency of Diesel cycle approaches to Otto cycle efficiency when
cut-off is increased
cut-off is decreased
cut-off is zero
cut-off is constant
✅ The correct answer is option C.