4th Class ABSA Exam Part A Practice Questions And Answers Solved 100% Correct!!
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4th Class ABSA Exam Part A Practice Questions And Answers Solved 100% Correct!!
Absolute pressure is:
gauge pressure plus atmospheric pressure
The motion of moving parts is _____ by friction:
A: Prevented
B: Improved
C: controlled
D: resisted
E: Regulated
D: resisted
Voltage is
...
Voltage is
a) the rate of current flow
b) the rate of electron flow
c) electromotive force
d) Kinetic energy
e) A form of power
c) electromotive force
The resistance of a conductor is affected by:
1. Cross section area
2. Length
3. Temperature
4. Type of material
a) 1,2,3
b) 1,2,4
c) 1,3
d) 1,2,3,4
e) 1,2
d) 1,2,3,4
The movement of electrons in a conductor can be measured in:
a) Amperes
b) Ohms
c) Volts
d) Watts
e) Micrometer
a) Amperes
An electric motor has a 3/4 horse power output rating. Calculate the rating in kilowatts:
a) 0.56
b) 0.75
,c) 0.70
d) 7.5
e) 1.005
a) 0.56
The connection provided on DC motors to supply the armature with power:
a) are slip rings
b) are field poses
c) is a rheostat
d) commutator
e) is a rotating conductor
d) commutator
The unit for the oppostion to current flow is the:
a) volt
b) amperes
c) ohm
d) watt
e) resistance
c) ohm
In an electric circuit protected by a single fuse the current flowing through the fuse must be:
a) Equal to the voltage in the circuit
b) Equal to the resistance in the circuit
c) All of the current in the circuit
d) Equal to the rated value of the fuse
e) 1.732 times the applied current
d) Equal to the rated value of the fuse
Electric overloads may be due to
1. Applying too heavy load to an electric motor
2. Lightning strike
3. A short circuit
4. Overloading a circuit with too many devices
5. Addition of circuit breakers
a) 1,2,3,4
b) 1,3,4,5
c) 1,2,5
d) 2,3,4
e) 1,3,5
a) 1,2,3,4
Since the discovery of electrons, it has been determined that electrons are a negative charge and flow
from:
Select one:
a. positive to negative
b. north to south
,c. south to north
d. a lower potential to a higher potential
e. a higher potential to a lower potential
d
The yoke that supports the main components of the DC machine is frequently made of:
a) Copper or brass
b) Mica and carbon
c) Copper and carbon
d) Cast steel or iron
e) Stainless steel
d
Electrical current flow through a conductor is caused by the drift of:
a) Photons
b) Neutrons
c) Electrons
d) Proteins
e) Protons
c
A device used to change the voltage and current from one level to another is known as:
a) Conductor
b) Resistor
c) Alternator
d) Transformer
e) Shunt
d
Three resistances of 4, 8, 12, Ohms are connected in parallel in a DC circuit. The total resistance in the
circuit will be:
a) 24 ohms
b) 12 ohms
c) 0.58 ohms
d) 0.46 ohms
e) 2.18 ohms
e
A thermocouple consists of:
Select one:
a. A filament that is compared to the object being measured
b. Two dissimilar wires connected together
c. Two dissimilar wires connected to a battery
d. Two similar wires separated by another metal
e. Two dissimilar wires connected to a computer
b
, The electrical resistance of the conductor on a strain gauge will increase when a tensile force is
applied because the wire grid of the strain gauge will:
a) Decrease in length and cross-sectional area
b) Increase in length and cross-sectional area
c) Decrease in length
d) Increase in length and decrease in cross-sectional area
e) Decrease in cross-sectional area
d
Modulating combustion controls:
a) regulate the steam and feedwater supply
b) Regulate the fuel and air supply
c) Control the oil atomizer
d) Control the back draft damper
e) Modulate the water supply proportional to the air supply
b
A pyrometer is used to measure:
a) specific gravity
b) Temperature
c) Viscosity
d) The composition of flue gases
e) sensible heat
b
Which of the following controls would you expect to find on a hot water control?
1. Low water fuel cut-off
2. Operating temperature control
3. High limit pressure control
4. High limit temperature control
a) 1, 2, 4
b) 2, 3, 4
c) 1, 2, 3
d) 1, 3, 4
e) 3, 4
a
ASME Section IV requires that hot water heating boilers must be equipped with a
a) thermometer
b) fusible plug
c) return trap
d) hartford loop
e) stop and check valve
a
When air is heated without changing the moisture content which type of heat is added?
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