Free Sample of Dangote Refinery Past Questions And Answers

CHEMICAL ENGINEERING

1. What is the energy balance of closed system?
a) Matter in the system is constant
b) Energy in the system is constant
c) Neither energy nor matter is constant
d) Both of energy and matter are constant

2. Which of the following is the humidity chart?
a) Psychrometric chart
b) Psychometric chart
c) Psychological chart
d) None of the mentioned

3. Humidity chart relates which of the following balances?
a) Momentum and energy balance
b) Material and energy balance
c) Material and momentum balance
d) None of the mentioned

4. What are the number of degrees of freedom if the number of variables and number of equations are 10 and 8 respectively?
a) 2
b) 8
c) 10
d) 18

5. What are the number of degrees of freedom if the number of variables and number of equations are 15 and 10 respectively?
a) 5
b) 10
c) 15
d) 25

Mechanical engineering

1. One kg of diatomic Oxygen is present in a 500 L tank. Find the specific volume on both mass and mole basis.
a) 0.6 m3/kg , 0.260 m3/mole
b) 0.5 m3/kg , 0.0160 m3/mole
c) 0.56 m3/kg , 0.0215 m3/mole
d) 0.7 m3/kg , 0.0325 m3/mole

2. A piston/cylinder with a cross-sectional area of 0.01 m^2 is resting on the stops. With an outside pressure of 100 kPa, what should be the water pressure to lift the piston?
a) 178kPa
b) 188kPa
c) 198kPa
d) 208kPa

3. Equation of continuity comes from
a) conservation of energy
b) conservation of mass
c) conservation of work
d) conservation of heat

4. In a flow process, the work transfer may be of which type?
a) external work
b) flow work
c) all of the mentioned
d) none of the mentioned

5. The total rate of flow of all energy streams entering the control volume must equal to that of leaving the control volume.
a) true
b) false

CHEMICAL / PETROLEUM ENGINEERING

1. What is the energy balance of closed system?
a) Matter in the system is constant
b) Energy in the system is constant
c) Neither energy nor matter is constant
d) Both of energy and matter are constant

2. Which of the following is the humidity chart?
a) Psychrometric chart
b) Psychometric chart
c) Psychological chart
d) None of the mentioned

3. Humidity chart relates which of the following balances?
a) Momentum and energy balance
b) Material and energy balance
c) Material and momentum balance
d) None of the mentioned

4. What are the number of degrees of freedom if the number of variables and number of equations are 10 and 8 respectively?
a) 2
b) 8
c) 10
d) 18

5. What are the number of degrees of freedom if the number of variables and number of equations are 15 and 10 respectively?
a) 5
b) 10
c) 15
d) 25