Slip-Test Type Questions Flashcards
Particles in a solid are
- Closely bound with no room for movement
- closely bound with room for vibration
- free flowing
*
closely bound with room for vibration
Hooke’s original law, relating to the stretching of materials, is the relationship between
- stress and strain
- load and extension
load and extension
The quadrature component of a vector is
a) 45 degrees to the original
b) 90 degrees to the original
c) 180 degrees to the original
b) 90 degrees to the original
'’A vector representing an alternating quantity which is in quadrature (at 90^) with some reference vector.
Two couples with magnitude F act against each other. The resultant will be.
a) -2F
b) 2F
c) 0
Forces passing through a common point are said to be.
a) coherent
b) coplanar
c) concurrent
c) concurrent
32) The advantage of using a machine is
a) mechanical advantage of input
b) mechanical advantage of output
c) input work is less than the output work
A dot rotates around the circumference of a circle. If the vertical position of this dot is plotted on a graph with respect to time the result will be
a) a linear motion
b) a transverse waveform
c) a sinusoidal waveform
c) a sinusoidal waveform
100 m is approximately
a) 220 yards
b) 109 yards
c) 66 yards
b) 109 yards
Newton’s laws of motion apply to
a) solid substances only
b) all substances irrespective of state
c) gases and liquids only
a) solid substances only (acting as single point masses)
What does ‘temperature of a body’ mean?
(a) How it radiates heat
(b) Its hotness
(b) Its hotness
What is 1 BTU / lb in Joules per Kilogram?
(a) 4128 joules per kg
(b) 9.18 joules per kg
(c) 2326 joules per kg
(c) 2326 joules per kg
Remember 1 BTU = 1054 Joules
Which type of circuit is used when the temperature of the source has insufficient heat for thermocouple application?
thermistor
When a system undergoes a complete cycle where the net heat supplied is equal to work done plus a change in internal energy - this is known as
(a) 2nd law of thermodynamics
(b) First law of thermodynamics
(c) Ideal Gas Law
(b) First law of thermodynamics
Conservation of energy
You are at the north pole where the temperatue is 50^C below freezing. What sort of thermometer would you use to measure it?
(a) Mercury
(b) Water
(c) Alcohol
(c) Alcohol
The latent heat of fusion is the heat required to
a) change a liquid to a vapour
b) produce a rise in temperature of a liquid
c) change a solid to a liquid
c) change a solid to a liquid = latent heat of fusion
latent heat of vaporisation = change a liquid to a vapour(gas)
Heat is defined as
(a) energy transfer due to molecular motion
(b) energy transfer resulting from a temperature difference
(b) energy transfer resulting from a temperature difference
A material capable of going direct from a solid to gas is a
a) sublimate
b) substance
c) substrate
a)sublimate
A process where heat is given off to its surroundings is called
a) isobaric
b) Isothermal
c) Adiabatic
b) Isothermal
‘Adiabatic’ is a process where No heat is given off to its surroundings.
Isobaric is constant pressure.
Isothermal, to keep constant temperature must give off heat as it is compressed
The transmission of heat through a substance by the movement of free molecules is called
conduction
The coefficient of cubic expansion of a material having a coefficient of linear expansion
10 x10-6 / ^C is what?-6
Remember
linear expansion = change in length = (a)(original length)(change in temp)
note cubic means volume
so remembring equation: Change in volume = 3(a)(original length)(change in temp)
mutiply original by 3 to get cublic / volume
answer = 30 x30-6 /^C
An ideal material for use as a heat exchanger will have a
a) low specific heat capacity and high conduction
b) high specific heat capacity and high conduction
b) high specific heat capacity and high conduction
During the compression stroke of a 4-stroke engine, the work done on the air is 70 kJ/kg and the heat wasted is 40 kJ/kg. The change in internal energy of the air will be
a) 110 kj / kg
b) 30 kj/kg
Remember the first law of thermodynamics, energy cannot be created nor destroyed (conservation of energy)
b) 30 kj/kg
Copper is used for soldering iron bits because it
a) has a high specific heat capacity
b) has a low specific heat capacity
b) has a low specific heat capacity
Low specific heat capacity means it heats up quickly with minimal energy input
If heat is constant, and if pressure increases on a liquid what will the volume do?
a) decrease
b) increase
c) remain constant
c) remain constant
'’Liquids are considered incompressible, therefore their volume remains constant’’
