Departmental (other) • Engineering Paper-II (Mechanical Engineers Under Electrical Wing)
The appropriate rate equation for convective heat transfer between a surface and adjacent fluid is prescribed by which law?
A)
Newton’s law of cooling
B)
Kirchhoff’s law
C)
Newton’s first law
D)
Wein’s displacement law
Newton’s law of cooling gives convective heat-transfer rate.
Departmental (other) • Engineering Paper-II (Mechanical Engineers Under Electrical Wing)
For conduction heat transfer, the heat energy propagation will be minimal for
A)
Copper
B)
Air
C)
Water
D)
Lead
Air has much lower thermal conductivity than copper, water or lead.
Departmental (other) • Engineering Paper-II (Mechanical Engineers Under Electrical Wing)
Hydraulic turbines are classified based on
A)
Energy available at inlet of turbine
B)
Direction of flow through vanes
C)
Head at inlet of turbine
D)
Energy available, Direction of flow, Head at inlet
Hydraulic turbines can be classified by energy available, flow direction and head at inlet.
Departmental (other) • Engineering Paper-II (Mechanical Engineers Under Electrical Wing)
A compressor at high altitude will draw
A)
more power
B)
less power
C)
Isothermal compression
D)
Isentropic compression
At high altitude the lower air density means the compressor draws less mass flow and generally less power for a comparable inlet condition.
Departmental (other) • Engineering Paper-II (Mechanical Engineers Under Electrical Wing)
If all the processing equipment and machines are arranged according to the sequence of operations of a product, the layout is known as
A)
Product layout
B)
Process layout
C)
Process layout
D)
Combination layout
Arranging machines in product operation sequence is a product layout.
Departmental (other) • Engineering Paper-II (Mechanical Engineers Under Electrical Wing)
Which among these is the main component of a gas turbine plant?
A)
Condenser
B)
Compressor
C)
Boiler
D)
Both Compressor & Boiler
The compressor is a principal gas-turbine component.
Departmental (other) • Engineering Paper-II (Mechanical Engineers Under Electrical Wing)
High specific speed of turbine implies that it is
A)
Francis turbine
B)
Propeller turbine
C)
Pelton turbine
D)
Kaplan turbine
High specific speed is associated with propeller/Kaplan-type turbines; among the options, propeller is intended.
Departmental (other) • Engineering Paper-II (Mechanical Engineers Under Electrical Wing)
Tap water is not preferred as coolant while drilling. What is the reason for this?
A)
Insufficient cooling effect
B)
Danger of corrosion
C)
Quick evaporation of water
D)
Decrease in cutting action of drill
Tap water can promote corrosion of drilling equipment.
Departmental (other) • Engineering Paper-II (Mechanical Engineers Under Electrical Wing)
Compressor used in Window Air Conditioner is ;
A)
Rotary compressor
B)
Reciprocating compressor
C)
Sealed compressor
D)
Open type compressor
Window air-conditioners traditionally use sealed/hermetic reciprocating compressors; among the choices, reciprocating is intended.
Departmental (other) • Engineering Paper-II (Mechanical Engineers Under Electrical Wing)
Gnatt chart provides information about
A)
material handling
B)
proper utilisation of manpower
C)
production schedule
D)
efficient working of machine
A Gantt chart is used to show the production schedule and timing of activities.
Departmental (other) • Engineering Paper-II (Mechanical Engineers Under Electrical Wing)
Centrifugal pump is a
A)
Turbomachinery
B)
Flow regulating device
C)
Drafting device
D)
Intercooling device
A centrifugal pump is turbomachinery.
Departmental (other) • Engineering Paper-II (Mechanical Engineers Under Electrical Wing)
If it is required to connect two parallel shafts, the distance between whose axes is small and variable, the shafts are coupled by
A)
universal joint
B)
knuckle joint
C)
Oldham’s coupling
D)
flexible coupling
A flexible coupling accommodates small changes and misalignment between parallel shafts; the item is likely intended to select flexible coupling.
Departmental (other) • Engineering Paper-II (Mechanical Engineers Under Electrical Wing)
Pelton wheel is used in those place where
A)
high head and low discharge are available
B)
low head and high discharge are available
C)
high head and high discharge are available
D)
low head and low discharge are available
Pelton turbines suit high-head, low-discharge sites.
Departmental (other) • Engineering Paper-II (Mechanical Engineers Under Electrical Wing)
The main function of nozzle is to
A)
Varying temperatures
B)
Pressure variations
C)
Load variations
D)
Heat variations
A nozzle primarily produces controlled pressure/velocity changes in a fluid stream; among these choices pressure variation is intended.
Departmental (other) • Engineering Paper-II (Mechanical Engineers Under Electrical Wing)
For small discharge and high heads which pump is preferred?
A)
centrifugal type
B)
reciprocating type
C)
axial flow type
D)
radial flow type
Reciprocating pumps are preferred for small discharge and high head.
Departmental (other) • Engineering Paper-II (Mechanical Engineers Under Electrical Wing)
In a hydraulic crane is the component mainly responsible for lifting.
A)
Boom
B)
Counter-weights
C)
Jib
D)
Rotex Gear
The boom is the primary lifting member of a hydraulic crane.
Departmental (other) • Engineering Paper-II (Mechanical Engineers Under Electrical Wing)
In a Hartnell governor, if the stiffness of the spring is increased, the governor will become
A)
less sensitive
B)
more sensitive
C)
hunting
D)
isochronous
Increasing spring stiffness makes a Hartnell governor less sensitive.
Departmental (other) • Engineering Paper-II (Mechanical Engineers Under Electrical Wing)
Which of the following refrigerants are used in Electrolux and Li-Br water refrigeration system?
A)
Ammonia and Water
B)
Water and Bromide
C)
Ammonia and Lithium
D)
Water and Fluoride
Electrolux absorption refrigeration uses ammonia-water; Li-Br systems use lithium bromide-water. The options are imperfect, with A the intended general pairing.
Departmental (other) • Engineering Paper-II (Mechanical Engineers Under Electrical Wing)
Heavy lifting work is often accomplished by shifting fluids in big machines. The power system of such machines can be described as
A)
Reciprocating
B)
Pneumatic
C)
Hydraulic
D)
Hybrid
Hydraulic systems transmit power using pressurized fluid.
Departmental (other) • Engineering Paper-II (Mechanical Engineers Under Electrical Wing)
Hydraulic gradient line represents the sum of
A)
pressure head and kinetic head
B)
kinetic head and datum head
C)
pressure head, kinetic head and datum head
D)
pressure head and datum head
Hydraulic grade line = pressure head + datum/elevation head.
Departmental (other) • Engineering Paper-II (Mechanical Engineers Under Electrical Wing)
Vee-belt E-type cross-sections are generally used in
A)
Automobiles
B)
Small Engines
C)
Heavy duty machine
D)
When driver and driven units are far off
V-belts of automotive type are commonly used in automobiles.
Departmental (other) • Engineering Paper-II (Mechanical Engineers Under Electrical Wing)
Pneumatic and other power systems can support three kinds of motion; they are-
A)
Linear, reciprocating, and random motion
B)
Linear, flowing, and rotary motion
C)
Linear, zigzag, and spiral motion
D)
Linear, reciprocating, and rotary motion
The standard three motion types are linear, reciprocating and rotary.
Departmental (other) • Engineering Paper-II (Mechanical Engineers Under Electrical Wing)
The ratio of indicated HP to shaft HP is known as
A)
Volumetric efficiency
B)
Mechanical efficiency
C)
Compressor efficiency
D)
Thermal efficiency
Mechanical efficiency = indicated power / shaft (brake) power in the supplied wording? The standard compressor relation is actually shaft power vs indicated power; item is likely keyed B.
Departmental (other) • Engineering Paper-II (Mechanical Engineers Under Electrical Wing)
The gas turbine power plant mainly uses which among the following fuels?
A)
Coal and Peat
B)
Kerosene oil and diesel oil and residual oil
C)
Gas oil
D)
Natural gas and liquid petroleum fuel
Gas-turbine plants commonly use natural gas and liquid petroleum fuels.
Departmental (other) • Engineering Paper-II (Mechanical Engineers Under Electrical Wing)
TIG welding is best suited for welding
A)
Stainless steel
B)
Carbon steel
C)
Aluminium
D)
Silver
TIG welding is especially suited to aluminium and other non-ferrous metals.
