Metrology and instru mid 1 qp.docx

1. SET - I DOE:
J.B. INSTITUTE OF ENGINEERING & TECHNOLOGY
UGC Autonomous
III B.Tech - II Semester - I MID Examinations (2020 Batch) -APRIL-2023
DESIGN OF MACHINE MEMBERS – II
Mechanical Engineering
Time:1hr 20min
Answer all questions
Total Marks: 20
5 X 4 =20 Marks
1
Design a journal bearing for a centrifugal pump from the following
data : Load on the journal = 20 000 N; Speed of the journal = 900
r.p.m.; Type of oil is SAE 10, for which the absolute viscosity at
55°C = 0.017 kg / m-s; Ambient temperature of oil = 15.5°C ;
Maximum bearing pressure for the pump = 1.5 N / mm2.Calculate
also mass of the lubricating oil required for artificial cooling, if rise of
temperature of oil be limited to 10°C. Heat dissipation coefficient =
1232 W/m2/°C.
CO1 L3
(OR)
A full journal bearing of 50 mm diameter and 100 mm long has a
bearing pressure of 1.4 N/mm2. The speed of the journal is 900 r.p.m.
and the ratio of journal diameter to the diametral clearance is 1000.
The bearing is lubricated with oil whose absolute viscosity at the
operating temperature of 75°C may be taken as 0.011 kg/m-s. The
room temperature is 35°C. Find : 1. The amount of artificial cooling
required, and 2. The mass of the lubricating oil required, if the
difference between the outlet and inlet temperature of the oil is 10°C.
Take specific heat of the oil as
1850 J / kg / °C.
CO1 L3
2
Design a cast iron piston for a single acting four stroke engine for the
following data:Cylinder bore = 100 mm ; Stroke = 125 mm
;Maximum gas pressure = 5 N/mm2 ; Indicated mean effective
pressure = 0.75 N/mm2 ; Mechanical efficiency = 80% ; Fuel
consumption = 0.15 kg per brake power per hour ; Higher calorific
value of fuel = 42 × 103 kJ/kg ; Speed = 2000 r.p.m. Any other data
required for the design may be assumed.
CO2 L1
(OR)
Design a cast iron piston for a four stroke I.C engine, for the
following specifications: Cylinder bore = 120 mm; Stroke length =
150 mm; Maximum gas pressure = 5 MPa; Brake mean effective
pressure = 0.7 MPa; Fuel consumption =0.25 kg/kW/hr; Speed =
2400 rpm. Assume any other data necessary for the design.
CO2 L4
3
The rolling contact ball bearing are to be selected to support the
overhung countershaft. The shaft speed is 720 r.p.m. The bearings are
to have 99% reliability corresponding to a life of 24 000 hours. The
bearing is subjected to an equivalent radial load of 1 kN. Consider life
adjustment factors for operating condition and material as 0.9 and
0.85 respectively. Find the basic dynamic load rating of the bearing
from manufacturer's catalogue, specified at 90% reliability.
CO1 L4
(OR)
A four stroke diesel engine has the following specifications :
Brake power = 5 kW ; Speed = 1200 r.p.m. ; Indicated mean effective
pressure = 0.35 N / mm 2 ; Mechanical efficiency = 80 %.
Determine : 1. bore and length of the cylinder ; 2. thickness of the
cylinder head ; and 3. size of studs for the cylinder head.is 1 kN, and
the coefficient of friction between the belt and pulley is 0.25?
CO2 L4
4
Select a single row deep groove ball bearing for a radial load of
4000 N and an axial load of 5000 N, operating at a speed of 1600
r.p.m. for an average life of 5 years at 10 hours per day. Assume
uniform and steady load. Take X = 0.56 and Y = 1.
CO1 L2
(OR)

2. Determine the dimensions of an I-section connecting rod for a petrol
engine from the following data :Diameter of the piston = 110 mm
Mass of the reciprocating parts = 2 kg,Length of the connecting rod
from centre to centre = 325 mm Stroke length = 150 mm,R.P.M. =
1500 with possible overspeed of 2500 Compression ratio = 4 : 1
Maximum explosion pressure = 2.5 N/mm2
CO2 L4
Paper set by. SHAIK ASHRAF
SET - II DOE:
J.B. INSTITUTE OF ENGINEERING & TECHNOLOGY

3. UGC Autonomous
III B.Tech - II Semester - I MID Examinations (2020 Batch) -April-2023
DESIGN OF MACHINE MEMBERS – II
Mechanical Engineering
Time:1hr 20min
Answer all questions
Total Marks: 20
5 X 4 =20 Marks
1
The load on the journal bearing is 150 kN due to turbine shaft of 300
mm diameter running at 1800 r.p.m. Determine the following :
1. Length of the bearing if the allowable bearing pressure is 1.6
N/mm2, and 2. Amount of heat to be removed by the lubricant per
minute if the bearing temperature is 60°C and viscosity of the oil at
60°C is 0.02kg/m-s and the bearing clearance is 0.25 mm.
CO1 L3
(OR)
Design a journal bearing for a centrifugal pump from the following
data : Load on the journal = 20 000 N; Speed of the journal = 900
r.p.m.; Type of oil is SAE 10, for which the absolute viscosity at
55°C = 0.017 kg / m-s; Ambient temperature of oil = 15.5°C ;
Maximum bearing pressure for the pump = 1.5 N / mm2. Calculate
also mass of the lubricating oil required for artificial cooling, if rise of
temperature of oil be limited to 10°C. Heat dissipation coefficient =
1232 W/m2/°C.
CO1 L3
2
Design a cast iron piston for a four stroke I.C engine, for the
following specifications: Cylinder bore = 120 mm; Stroke length =
150 mm; Maximum gas pressure = 5 MPa; Brake mean effective
pressure = 0.7 MPa; Fuel consumption =0.25 kg/kW/hr; Speed =
2400 rpm. Assume any other data necessary for the design.
CO2 L4
(OR)
Determine the dimensions of an I-section connecting rod for a petrol
engine from the following data :Diameter of the piston = 110 mm
Mass of the reciprocating parts = 2 kg,Length of the connecting rod
from centre to centre = 325 mm Stroke length = 150 mm,R.P.M. =
1500 with possible overspeed of 2500 Compression ratio = 4 : 1
Maximum explosion pressure = 2.5 N/mm2
CO2 L3
3 The rolling contact ball bearing are to be selected to support the
overhung countershaft. The shaft speed is 720 r.p.m. The bearings are
to have 99% reliability corresponding to a life of 24 000 hours. The
bearing is subjected to an equivalent radial load of 1 kN. Consider life
adjustment factors for operating condition and material as 0.9 and
0.85 respectively. Find the basic dynamic load rating of the bearing
from manufacturer's catalogue, specified at 90% reliability.
CO1 L4
(OR)
Design a cast iron piston for a single acting four stroke engine for the
following data:Cylinder bore = 100 mm ; Stroke = 125 mm
;Maximum gas pressure = 5 N/mm2 ; Indicated mean effective
pressure = 0.75 N/mm2 ; Mechanical efficiency = 80% ; Fuel
consumption = 0.15 kg per brake power per hour ; Higher calorific
value of fuel = 42 × 103 kJ/kg ; Speed = 2000 r.p.m. Any other data
required for the design may be assumed.
CO2 L4
4
Select a single row deep groove ball bearing for a radial load of 4000
N and an axial load of 5000 N, operating at a speed of 1600 r.p.m. for
an average life of 5 years at 10 hours per day. Assume uniform and
steady load. Take X = 0.56 and Y = 1.
CO1 L2
(OR)
A four stroke diesel engine has the following specifications :
Brake power = 5 kW ; Speed = 1200 r.p.m. ; Indicated mean effective
pressure = 0.35 N / mm 2 ; Mechanical efficiency = 80 %.
Determine : 1. bore and length of the cylinder ; 2. thickness of the
cylinder head ; and 3. size of studs for the cylinder head.
CO2 L4

4. Paper set by. SHAIK ASHRAF
SET - III DOE:
J.B. INSTITUTE OF ENGINEERING & TECHNOLOGY
UGC Autonomous
III B.Tech - II Semester - I MID Examinations (2020 Batch) -April-2023
DESIGN OF MACHINE MEMBERS – II
Mechanical Engineering
Time:1hr 20min
Answer all questions
Total Marks: 20
5 X 4 =20 Marks
1
A full journal bearing of 50 mm diameter and 100 mm long has a
bearing pressure of 1.4 N/mm2. The speed of the journal is 900 r.p.m.
and the ratio of journal diameter to the diametral clearance is 1000.
The bearing is lubricated with oil whose absolute viscosity at the
operating temperature of 75°C may be taken as 0.011 kg/m-s. The
room temperature is 35°C. Find :
1. The amount of artificial cooling required, and 2. The mass of the
lubricating oil required, if the
difference between the outlet and inlet temperature of the oil is 10°C.
Take specific heat of the oil as
1850 J / kg / °C.
CO1 L4
(OR)
Design a journal bearing for a centrifugal pump from the following
data : Load on the journal = 20 000 N; Speed of the journal = 900
r.p.m.; Type of oil is SAE 10, for which the absolute viscosity at
55°C = 0.017 kg / m-s; Ambient temperature of oil = 15.5°C ;
Maximum bearing pressure for the pump = 1.5 N / mm2. Calculate
also mass of the lubricating oil required for artificial cooling, if rise of
temperature of oil be limited to 10°C. Heat dissipation coefficient =
1232 W/m2/°C.
CO1 L3
2
Design a cast iron piston for a single acting four stroke engine for the
following data:Cylinder bore = 100 mm ; Stroke = 125 mm
;Maximum gas pressure = 5 N/mm2 ; Indicated mean effective
pressure = 0.75 N/mm2 ; Mechanical efficiency = 80% ; Fuel
consumption = 0.15 kg per brake power per hour ; Higher calorific
value of fuel = 42 × 103 kJ/kg ; Speed = 2000 r.p.m. Any other data
required for the design may be assumed.
CO2 L2
(OR)
Design a cast iron piston for a four stroke I.C engine, for the
following specifications: Cylinder bore = 120 mm; Stroke length =
150 mm; Maximum gas pressure = 5 MPa; Brake mean effective
pressure = 0.7 MPa; Fuel consumption =0.25 kg/kW/hr; Speed =
2400 rpm. Assume any other data necessary for the design.
CO2 L4
3
The rolling contact ball bearing are to be selected to support the
overhung countershaft. The shaft speed is 720 r.p.m. The bearings are
to have 99% reliability corresponding to a life of 24 000 hours. The
bearing is subjected to an equivalent radial load of 1 kN. Consider life
adjustment factors for operating condition and material as 0.9 and
0.85 respectively. Find the basic dynamic load rating of the bearing
from manufacturer's catalogue, specified at 90% reliability.
CO1 L3
(OR)
A four stroke diesel engine has the following specifications :
Brake power = 5 kW ; Speed = 1200 r.p.m. ; Indicated mean effective
pressure = 0.35 N / mm 2 ; Mechanical efficiency = 80 %.
Determine : 1. bore and length of the cylinder ; 2. thickness of the
cylinder head ; and 3. size of studs for the cylinder head.
CO2 L3
4
A single row angular contact ball bearing number 310 is used for an
axial flow compressor. The bearing is to carry a radial load of 2500 N
and an axial or thrust load of 1500 N.Assuming light shock load,
CO1 L4

5. determine the rating life of the bearing.takeX = 1 and Y = 0 and (KS)
=1.5
(OR)
Determine the dimensions of an I-section connecting rod for a petrol
engine from the following data :Diameter of the piston = 110 mm
Mass of the reciprocating parts = 2 kg,Length of the connecting rod
from centre to centre = 325 mm Stroke length = 150 mm,R.P.M. =
1500 with possible overspeed of 2500 Compression ratio = 4 : 1
Maximum explosion pressure = 2.5 N/mm2
CO2 L4
Paper set by. SHAIK ASHRAF