VTU First Year Engineering (P Cycle) (Semester 2)
Elements of Mechanical Engg.
December 2013
Total marks: --
Total time: --
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

Choose the correct answer for the following :-
1 (a) (i) Coal is ana example for _____ energy sources.
(A) renewable
(B) non-renewable
(C) celestial energy
(D) bio-mass
1 M
1 (a) (ii) Photosynthesis process is also known as
(A) Helio thermal process
(B) Helio chemical process
(C) Helio electrical process
(D) Pizeo electric process
1 M
1 (a) (iii) Partially dry steam and partially wet particles in steam called as
(A) dry steam
(B) super heated steam
(C) saturated water
(D) wet steam
1 M
1 (a) (iv) Badcock and Wilcock boiler is an example for _____
(A) fire tube boiler
(B) vertical boiler
(C) single tube boiler
(D) externally fired boiler
1 M
1 (b) Name any four boiler mountings and state their functions,
2 M
1 (c) With the help of neat sketch, explain the working of a Francis turbine.
8 M
1 (d) Determine the total heat content per unit mass at the following state using the steam tables. Assume ambient pressure to be 100kPa and CP=2.0934 kJ/kg.
(i) 10 bar absolute and 300°C
(ii) 100 kPa guage and 100 kPa abs and 250°C
(C) Dry steam at 100 kPa abs
(iv) Steam at 12 bar and 95% dry
6 M

Choose the correct answer for the following :-
2 (a) (i) Steam turbine converts _____ in to mechanical energy.
(A) kinetic energy
(B) weight
(C) velocity
(D) potential
1 M
2 (a) (ii) Compounding consists of one ste nozzel and two or more set of moving blades called as
(A) velocity compounding
(B) pressure compounding
(C) pressure velocity compounding
(D) velocity pressure compounding
1 M
2 (a) (iii) Pelton wheel is example for
(A) reaction water turbine
(B) low head water turbine
(C) impulse water turbine
(D) steam turbine
1 M
2 (a) (iv) Combustioned gas it directly converted into the mechanical power called as
(A) reaction turbine
(B) impulse turbine
(C) open or closed gas turbine
(D) steam turbine
1 M
2 (b) Explain the principle and working of reaction turbine
6 M
2 (c) With the help of neat sketch, explain the working of a Francis turbine.
6 M
2 (d) Explain the working principle of a gas turbine on closed cycle.
4 M

Choose the correct answer for the following :-
3 (a) (i) Otto cycle engines is an example for
(A) petrol engine
(B) diesel engine
(C) dual engine
(D) all of these
1 M
3 (a) (ii) 4 stroke engine has power stroke in _____
(A) every cycle
(B) every alternative cycle
(C) every third cycle
(D) in all the revolution of the crank shaft
1 M
3 (a) (iii) In two stroke petrol engine compressive ratio is approximately
(A) 1:22
(B) 1:11
(C) 1:1
(D) 1:80
1 M
3 (a) (iv) Diesel cycle engine is also called as
(A) constant volume cycle
(B) constant pressure cycle
(C) dual cycle
(D) all of these
1 M
3 (b) Explain with a neat figure 4 stroke petrol engine
8 M
3 (c) Differentiate between 4 stroke and 2 stroke engine.
4 M
3 (d) Give advantages of two stroke engine over four stroke engine
4 M

Choose the correct answer for the following :-
4 (a) (i) Good refrigerant should be
(A) High boiling point
(B) flammable
(C) low thermal conductivity
(D) non-toxic
1 M
4 (a) (ii) Unit of refrigeration is
(A) COP of refrigeration
(B) Ton of refrigeration
(C) Ampere of refrigeration
(D) None of these
1 M
4 (a) (iii) Ammonia refrigerant is used in _____ refrigerator.
(A) Household
(B) Absorption
(C) Vapour compression
(D) air conditioner
1 M
4 (a) (iv) Function of the throttle valve in a refrigerator is to
(A) reduce the pressure
(B) increase the pressure
(C) converts vapour refrigerant into liquid
(D) liquid refrigerant into vapour conversion
1 M
4 (b) Describe with a neat sketch, the working of vapour absorption refrigerator.
8 M
4 (c) With a neat sketch of a room air-conditioner, explain its working principle.
8 M

Choose the correct answer for the following :-
5 (a) (i) Function of the lathe is
(A) produce cylindrical parts
(B) produce key holes
(C) produce slots
(D) all of these
1 M
5 (a) (ii) Speed lathe is example for
(A) geared head lathe
(B) simple lathe
(C) universal lathe
(D) caption lathe
1 M
5 (a) (iii) Reaming operation is a _____
(A) drill operation
(B) lathe operation
(C) milling operation
(D) grinding operation
1 M
5 (a) (iv) Radial drilling machine is used for
(A) small works
(B) medium works
(C) medium and heavy works
(D) all of these
1 M
5 (b) with a neat sketch, explain construction and operation of radial drilling machine.
8 M
5 (c) Explain with figure taper turning with compound slide swiveling method.
8 M

Choose the correct answer for the following :-
6 (a) (i) Milling machine removes the metal using
(A) multi point cutting tool
(B) single point cutting tool
(C) abrasive wheel
(D) drill bit
1 M
6 (a) (ii) Work piece and cutting tool moves in the same direction called as
(A) up milling
(B) down milling
(C) combination of up and down milling
(D) all of these
1 M
6 (a) (iii) Emery is an example for _____ abrasive.
(A) natural
(B) synthetic
(C) artificial
(D) clay
1 M
6 (a) (iv) Centre less grinding is used for
(A) long work piece
(B) short work piece
(C) both long and short work piece
(D) internal grinding
1 M
6 (b) With the help of neat sketch, explain the working of a universal milling machine.
8 M
6 (c) Explain with figure working principle of center less grinding machine
6 M
6 (d) Explain any two milling operation.
2 M

Choose the correct answer for the following :-
7 (a) (i) Fusion welding is an example for
(A) resistance welding
(B) arc welding
(C) forge welding
(D) Thermit pressure welding
1 M
7 (a) (ii) Copper base filler metal is used for
(A) soft soldering
(B) hard soldering
(C) brazing
(D) welding
1 M
7 (a) (iii) Grease is an example for _____ lubrication.
(A) solid
(B) liquid
(C) semi liquid
(D) all of these
1 M
7 (a) (iv) Collar bearing is also known as
(A) journal bearing
(B) thrust bearing
(C) foot step bearing
(D) radial bearing
1 M
7 (b) Explain the principle of arc welding with a figure.
6 M
7 (c) Name the three types of oxy-acetylene flame. Explain the application of each them
6 M
7 (d) Describe the drop feed oil lubrication with neat sketches.
4 M

Choose the correct answer for the following :-
8 (a) (i) Jockey pulley is used for
(A) increase arc of contact
(B) increase speed
(C) decrease arc of contact
(D) decrease in speed
1 M
8 (a) (ii) When a belt moves forward without carrying pulleys called _____
(A) slip
(B) creep
(C) both slip and creep
(D) all of these
1 M
8 (a) (iii) Chain drive is used in
(A) center distance less than 8m
(B) high power transmission
(C) positive power transmission
(D) all of these
1 M
8 (a) (iv) Spur gear is example for
(A) parallel axis
(A) non-parallel axis
(C) co-axial
(D) non-intersecting
1 M
8 (b) With neat sketch, explain past and loose pulley.
6 M
8 (c) Explain following gears
(i) Spur gear
(ii) Helical gear
(iii) Bevel gear
(iv) Rack and pinion
6 M
8 (d) In a compound train of wheels, the wheels A, B, C and D have 15, 30, 20 and 40 teeth respectively. The wheels B and C keyed to the same spindle. If the wheel A runs at 400 rpm, find the speed of the wheel D. sketch the arrangements.
4 M

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