4th Class ABSA Exam Part A Practice |942 questions
with accurate answers
2015 Paris Accord Ans✓✓✓ Identified the need to reduce the number
of coal-fired steam generating plants worldwide.
3rd class power engineer can take charge of what HEATING PLANT
a) ALL
b) 1000kW
c) 15000kW
d) 10000kW Ans✓✓✓
5th class power engineer can work as shift engineer in a power plant
rated at what capacity
a) 500kW
b) 1000kW
c) 5000kW
d) 10000kw Ans✓✓✓
70% of ash content fuel for FBC Ans✓✓✓
A 8 m bar is pivoted at 5 m from the left end. A force of 15 N is applied
downwardly on the left end and a force of 20 N is applied downwardly
on the right end. What would be the clockwise and counter-clockwise
moments and in which direction would the bar rotate?
,a. 60 Nm counter-clockwise, 75 Nm clockwise, counter-clockwise
rotation
b. 60 Nm counter-clockwise, 75 Nm clockwise, clockwise rotation
c. 75 Nm counter-clockwise, 60 Nm clockwise, clockwise rotation
d. 75 Nm counter-clockwise, 60 Nm clockwise, counter-clockwise
rotation
e. 60 Nm counter-clockwise, 60 Nm clockwise, equilibrium Ans✓✓✓ d
A block and tackle system has 3 pulleys in each of two
blocks. If a downward effort of 100 N is applied and the
machine has an efficiency of 83.6% what is the maximum mass
that can be moved?
a) 501.6 kg
b) 51.1 kg
c) 5,113.1 kg
d) 250 kg
e) 25.6 kg Ans✓✓✓ b
A boiler generates 10 kg of dry saturated steam per kg of fuel oil burned.
Fuel oil heating value is 28000 kJ/kg. Feedwater is supplied at 70°C and
the boiler pressure is 300 kPa. Calculate boiler efficiency. Ans✓✓✓
86.9%
,A boiler produces 6700 kg of steam per hour. During the same hour, the
feedwater flow was 6920 litres. Calculate the blowdown rate: Ans✓✓✓
3.2%
A crane motor must apply a force of 12 kN to lift and object 20 meters
in 30 seconds. Neglecting the motor and crane efficiency, what would
the motor current be when connected to a 600 V supply? Ans✓✓✓
13.33 A
A current of 1.1 A flows in a circuit with three resistors in series. R1 is
3.5 ohms, R2 is 2.4 ohms, and R3 is 5 ohms. Calculate:
a) The voltage applied to the circuit
b) The voltage drop across each resistor Ans✓✓✓ a) 12 V
b) E1 = 3.85V, E2 = 2.64V, E3 = 5.5V
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 Ans✓✓✓ d
, A diesel-powered standby generator has 8 field poles. It develops 50 Hz
AC power. At what speed does the diesel engine operate at? Ans✓✓✓
750 RPM
A firetube boiler is one which has
a) water on the inside of the tubes and the hot gas of combustion
on the outside.
b) the furnace as the first pass of the burner flame.
c) water on the outside of the tubes and hot water on the inside
of the tubes.
d) water on the outside of the tubes and the hot gas on the inside
of the tubes.
e) internally fired tubes surrounded by water Ans✓✓✓ d
A large diameter steel steam pipe is erected at 20°C and will carry steam
at a
temperature of 320°C. At operating temperatures, how much linear
expansion
will there be in a 30 m long straight section of this steam line?
Ans✓✓✓ 0.108 m
A pulley with a diameter of 12 cm drives another pulley with a diameter
of 30 cm. The driver rotates at 3450 rev/min.
with accurate answers
2015 Paris Accord Ans✓✓✓ Identified the need to reduce the number
of coal-fired steam generating plants worldwide.
3rd class power engineer can take charge of what HEATING PLANT
a) ALL
b) 1000kW
c) 15000kW
d) 10000kW Ans✓✓✓
5th class power engineer can work as shift engineer in a power plant
rated at what capacity
a) 500kW
b) 1000kW
c) 5000kW
d) 10000kw Ans✓✓✓
70% of ash content fuel for FBC Ans✓✓✓
A 8 m bar is pivoted at 5 m from the left end. A force of 15 N is applied
downwardly on the left end and a force of 20 N is applied downwardly
on the right end. What would be the clockwise and counter-clockwise
moments and in which direction would the bar rotate?
,a. 60 Nm counter-clockwise, 75 Nm clockwise, counter-clockwise
rotation
b. 60 Nm counter-clockwise, 75 Nm clockwise, clockwise rotation
c. 75 Nm counter-clockwise, 60 Nm clockwise, clockwise rotation
d. 75 Nm counter-clockwise, 60 Nm clockwise, counter-clockwise
rotation
e. 60 Nm counter-clockwise, 60 Nm clockwise, equilibrium Ans✓✓✓ d
A block and tackle system has 3 pulleys in each of two
blocks. If a downward effort of 100 N is applied and the
machine has an efficiency of 83.6% what is the maximum mass
that can be moved?
a) 501.6 kg
b) 51.1 kg
c) 5,113.1 kg
d) 250 kg
e) 25.6 kg Ans✓✓✓ b
A boiler generates 10 kg of dry saturated steam per kg of fuel oil burned.
Fuel oil heating value is 28000 kJ/kg. Feedwater is supplied at 70°C and
the boiler pressure is 300 kPa. Calculate boiler efficiency. Ans✓✓✓
86.9%
,A boiler produces 6700 kg of steam per hour. During the same hour, the
feedwater flow was 6920 litres. Calculate the blowdown rate: Ans✓✓✓
3.2%
A crane motor must apply a force of 12 kN to lift and object 20 meters
in 30 seconds. Neglecting the motor and crane efficiency, what would
the motor current be when connected to a 600 V supply? Ans✓✓✓
13.33 A
A current of 1.1 A flows in a circuit with three resistors in series. R1 is
3.5 ohms, R2 is 2.4 ohms, and R3 is 5 ohms. Calculate:
a) The voltage applied to the circuit
b) The voltage drop across each resistor Ans✓✓✓ a) 12 V
b) E1 = 3.85V, E2 = 2.64V, E3 = 5.5V
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 Ans✓✓✓ d
, A diesel-powered standby generator has 8 field poles. It develops 50 Hz
AC power. At what speed does the diesel engine operate at? Ans✓✓✓
750 RPM
A firetube boiler is one which has
a) water on the inside of the tubes and the hot gas of combustion
on the outside.
b) the furnace as the first pass of the burner flame.
c) water on the outside of the tubes and hot water on the inside
of the tubes.
d) water on the outside of the tubes and the hot gas on the inside
of the tubes.
e) internally fired tubes surrounded by water Ans✓✓✓ d
A large diameter steel steam pipe is erected at 20°C and will carry steam
at a
temperature of 320°C. At operating temperatures, how much linear
expansion
will there be in a 30 m long straight section of this steam line?
Ans✓✓✓ 0.108 m
A pulley with a diameter of 12 cm drives another pulley with a diameter
of 30 cm. The driver rotates at 3450 rev/min.
