95 practice sets · Page 4 of 5
Specific heat is defined as the amount of heat required
To raise unit of temp of a substance
To raise unit mass of substance through unit degree of temperature
To raise unit mass of substance through 100 C
None of this
Saturation temperature of steam increase
With decrease in pressure
with increase in pressure
is unaffected by pressure
none of the above
Reducing pressure angle on gears results in
Weaker teeth
Stronger teeth
High velocity ratio
High efficiency
Pump is a machine which is used to do
lift liquid from low height to higher elevation
To store liquid
To compress liquid
none of the above
Petroleum is
Solid fuel
Liquid fuel
Secondary fuel
None of this
Natural fuel is
That occur in nature
Known as secondary fuel
Prepared fuel
None of the above
Main disadvantage of nuclear energy is
High operating cost
Low efficiency
Waste disposal
All of above
In the Polytropic Process PVn= C, if n = infinity , the process is called
isochoric
isobaric
isothermal
adiabatic
In S.I. unit for the force is.
Kgm
Kgf
Newton
Lb
In multi stage compression as compared to single stage compression the volumetric efficiency is
more
less
Constant
None of the above
In Following which is the power producing device?
Pump
I.C. Engine
Compressor
Air Conditioner
In diesel cycle, heat is added at
constant temperature
constant enthalpy
constant volume
constant pressure
In a two stroke cycle engine, one cycle is completed in the following number of revolutions of the crank shaft
2
3
1
4
In a simple gear train having two gears, if driving gear rotates in clockwise direction then driven gear rotates in
Clockwise direction
Anti clockwise direction
Depend on size of gear
depend on no. of teeth
In a IC engine from which of the following source energy is converted into mechanical energy
Chemical energy of fuel.
potential energy
kinetic energy
All of the above
If xl and x2 are the dryness fractions obtained in separating calorimeter and throttling calorimeter respectively, then actual dryness fraction of steam is
XI - X2
XI + X2 /2
X1 + X2
X1 * X2
Function of piston rings is
To connect piston and connecting road
To transmit force from piston to crank
To maintain a gas tight between the piston and the cylinder
To convert reciprocating motion into rotary motion
For earth moving machines, widely used engines are:
Petrol engine
Steam engine
Diesel engine
Gas engine
During compression process which parameter will change?
Pressure
Volume
Density
All Of above
During adiabatic process
heat transfer is zero
enthalpy remains constant
work transfer is zero
enthalpy change is zero.
