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Multiple choice question for engineering

Set 1

1. _____________ is the form of energy that represents a transfer of energy between the system and surrounding.
a) Potential energy
b) Kinetic energy
c) Work
d) None of the mentioned

View Answer

Answer: c [Reason:] Work is the form of energy that represents a transfer of energy between the and surrounding.

2. Work ______ be stored.
a) Can
b) Can not
c) always can
d) None of the mentioned

View Answer

Answer: b [Reason:] Work cannot be stored.

3. Work is a ______________ variable.
a) Path
b) State
c) Neither Path nor State
d) None of the mentioned

View Answer

Answer: a [Reason:] Work is a Path variable.

4. When surrounding perform a work on the system, work is
a) Positive
b) Negative
c) Zero
d) None of the mentioned

View Answer

Answer: a [Reason:] When surrounding perform a work on the system, work is Positive.

5. Work is negative when ________ performs a work on the ____________________
a) System, Surrounding
b) Surrounding, System
c) System, System
d) Surrounding, Surrounding

View Answer

Answer: a [Reason:] Work is negative when System performs a work on the surrounding.

6. Which one is not a type of work?
a) Mechanical work
b) Electrical work
c) Shaft work
d) All of the mentioned

View Answer

Answer: d [Reason:] Mechanical, Electrical and Shaft are kind of work.

7. _______________ work that occurs because of a ________ force that moves the boundary of a system.
a) Mechanical, Mechanical
b) Electrical, Electrical
c) Shaft, Shaft
d) Flow, Flow

View Answer

Answer: a [Reason:] Mechanical work that occurs because of a Mechanical force that moves the boundary of a system.

8. If a system generates electric current and the current is passed through a resistance outside the system. The work done is
a) Positive
b) Negative
c) Zero
d) None of the mentioned

View Answer

Answer: b [Reason:] Work is done on the surrounding.

9. If electric work is done inside the system because of an applied voltage from outside the system, work done is ______________
a) Positive
b) Negative
c) Zero
d) None of the mentioned

View Answer

Answer: a [Reason:] This time work is done on the system.

10. _________ occurs when an electric current passes through an electric resistance in the circuit.
a) Mechanical work
b) Electrical work
c) Shaft work
d) Flow work

View Answer

Answer: b [Reason:] Electrical work occurs when an electric current passes through an electric resistance in the circuit.

Set 2

1. _____________ is the form of energy that represents a transfer of energy between the system and surrounding.
a) Potential energy
b) Kinetic energy
c) Work
d) None of the mentioned

View Answer

Answer: c [Reason:] Work is the form of energy that represents a transfer of energy between the and surrounding.

2. Work ______ be stored.
a) Can
b) Can not
c) always can
d) None of the mentioned

View Answer

Answer: b [Reason:] Work cannot be stored.

3. Work is a ______________ variable.
a) Path
b) State
c) Neither Path nor State
d) None of the mentioned

View Answer

Answer: a [Reason:] Work is a Path variable.

4. When surrounding perform a work on the system, work is
a) Positive
b) Negative
c) Zero
d) None of the mentioned

View Answer

Answer: a [Reason:] When surrounding perform a work on the system, work is Positive.

5. Work is negative when ________ performs a work on the ____________________
a) System, Surrounding
b) Surrounding, System
c) System, System
d) Surrounding, Surrounding

View Answer

Answer: a [Reason:] Work is negative when System performs a work on the surrounding.

6. Which one is not a type of work?
a) Mechanical work
b) Electrical work
c) Shaft work
d) All of the mentioned

View Answer

Answer: d [Reason:] Mechanical, Electrical and Shaft are kind of work.

7. _______________ work that occurs because of a ________ force that moves the boundary of a system.
a) Mechanical, Mechanical
b) Electrical, Electrical
c) Shaft, Shaft
d) Flow, Flow

View Answer

Answer: a [Reason:] Mechanical work that occurs because of a Mechanical force that moves the boundary of a system.

8. If a system generates electric current and the current is passed through a resistance outside the system. The work done is
a) Positive
b) Negative
c) Zero
d) None of the mentioned

View Answer

Answer: b [Reason:] Work is done on the surrounding.

9. If electric work is done inside the system because of an applied voltage from outside the system, work done is ______________
a) Positive
b) Negative
c) Zero
d) None of the mentioned

View Answer

Answer: a [Reason:] This time work is done on the system.

10. _________ occurs when an electric current passes through an electric resistance in the circuit.
a) Mechanical work
b) Electrical work
c) Shaft work
d) Flow work

View Answer

Answer: b [Reason:] Electrical work occurs when an electric current passes through an electric resistance in the circuit.

Set 3

1-9. For the given reaction
A FeS2 + b O2 → c Fe2O3 + d SO2
The reaction is balanced using the minimum values of the balancing coefficients.
1. What is the value of a?
a) 1
b) 2
c) 3
d) 4

View Answer

Answer: d [Reason:] Element Balance.

2. What is the value of b?
a) 11
b) 12
c) 13
d) 14

View Answer

Answer: a [Reason:] Element Balance.

3. What is the value of c?
a) 1
b) 2
c) 3
d) 4

View Answer

Answer: b [Reason:] Element Balance.

4. What is the value of d?
a) 2
b) 4
c) 6
d) 8

View Answer

Answer: d [Reason:] Element Balance.

5. What is the value of a+b+c-d?
a) 10
b) 20
c) 30
d) 40

View Answer

Answer: a [Reason:] Element Balance.

If for the above reaction, the extent of the reaction is 11 moles reacting.
6. How many moles of FeS2 are required for the reaction?
a) 11
b) 22
c) 33
d) 44

View Answer

Answer: d [Reason:] Required moles of FeS2 = 4(Extent of the reaction).

7. How many moles of O2 are required for the reaction?
a) 121
b) 11
c) 144
d) 12

View Answer

Answer: a [Reason:] Required moles of O2 = 11(Extent of the reaction).

8. How many moles of Fe2O3 are produced in the reaction?
a) 11
b) 22
c) 33
d) 44

View Answer

Answer: b [Reason:] Produced moles of Fe2O3= 2(Extent of the reaction).

9. How many Kgs of SO2 are produced in the reaction?
a) 5.632
b) 4.632
c) 3.632
d) 2.632

View Answer

Answer: a [Reason:] Produced Kgs of SO2 = 8*(Extent of the reaction)*64.

10. For a reaction, the extent of reaction equation is Ni = Nio + ϒVi is
Where:
Ni = Moles of species I present in the system after the reaction occurs
Nio = Moles of species I present in the system when the reaction starts
Vi = Stoichiometric coefficient for species i in the specified chemical reaction equation
ϒ = Extent of reaction
a) Correct
b) Incorrect
c) Some of the terms are defined wrong
d) None of the mentioned

View Answer

Answer: a [Reason:] Extent of the reaction for a reaction is, Ni = Nio + ϒVi.

Set 4

1. Extent of a reaction denotes
a) Total number of moles reacting in a reaction
b) How much a reaction is occurring?
c) Number of moles of a reactant that react in a reaction
d) None of the mentioned

View Answer

Answer: b [Reason:] It denotes that how much a reaction occurs.

2. The unit of extent of a reaction is
a) Unit-less
b) Moles reacting
c) Kg reacting
d) None of the mentioned

View Answer

Answer: b [Reason:] The unit of extent of a reaction is Moles reacting.

3-5. If 5 moles of N2 is combined with 12 moles of H2 as per given reaction.
N2 + 3 H2 → 2 NH3
3. What is the extent of reaction?
a) 12 moles reacting
b) 8 moles reacting
c) 4 moles reacting
d) 2 moles reacting

View Answer

Answer: c [Reason:] Extent of the reaction is = (5-1) / (1) = 4.

4. How many moles are left of N2 in the reaction?
a) 1 mole
b) 2 moles
c) 4 moles
d) 3 moles

View Answer

Answer: a [Reason:] Moles of N2 left in the reaction = 5-4 = 1 mole.

5. How many moles of NH3 are there in the reaction?
a) 1 mole
b) 2 moles
c) 4 moles
d) 8 moles

View Answer

Answer: d [Reason:] Moles of NH3 = 2*4 = 8.

6-9. For the given reaction
C3H8 + 5O2 → 3CO2 + 4H2O
88 kg of C3H8 is reacting with 160 moles of O2.

6. What is extent of the reaction?
a) 1 mole
b) 2 moles
d) 3 moles
c) 4 moles

View Answer

Answer: a [Reason:] 1 mole of C3H8 is reacting and then extent of reaction = (2-1) / (1) = 1.

7. How many kg moles of C3H8 left in the reaction?
a) 1 mole
b) 2 moles
d) 3 moles
c) 4 moles

View Answer

Answer: a [Reason:] 1 mole of C3H8 is reacting. Left moles = 2-1 = 1.

8. How many kg of CO2 is produced?
a) 132
b) 88
d) 44
c) 22

View Answer

Answer: a [Reason:] CO2 produced = 3*44=132.

9. How many kg of H2O is produced?
a) 72
b) 36
d) 12
c) 6

View Answer

Answer: a [Reason:] H2O produced = 4*18 = 72.

10. How many moles of O2 are there in the reaction?
a) 0
b) 36
d) 72
c) 108

View Answer

Answer: a [Reason:] O2 is a limiting reactant.

Set 5

1. Extent of a reaction denotes
a) Total number of moles reacting in a reaction
b) How much a reaction is occurring?
c) Number of moles of a reactant that react in a reaction
d) None of the mentioned

View Answer

Answer: b [Reason:] It denotes that how much a reaction occurs.

2. The unit of extent of a reaction is
a) Unit-less
b) Moles reacting
c) Kg reacting
d) None of the mentioned

View Answer

Answer: b [Reason:] The unit of extent of a reaction is Moles reacting.

3-5. If 5 moles of N2 is combined with 12 moles of H2 as per given reaction.
N2 + 3 H2 → 2 NH3
3. What is the extent of reaction?
a) 12 moles reacting
b) 8 moles reacting
c) 4 moles reacting
d) 2 moles reacting

View Answer

Answer: c [Reason:] Extent of the reaction is = (5-1) / (1) = 4.

4. How many moles are left of N2 in the reaction?
a) 1 mole
b) 2 moles
c) 4 moles
d) 3 moles

View Answer

Answer: a [Reason:] Moles of N2 left in the reaction = 5-4 = 1 mole.

5. How many moles of NH3 are there in the reaction?
a) 1 mole
b) 2 moles
c) 4 moles
d) 8 moles

View Answer

Answer: d [Reason:] Moles of NH3 = 2*4 = 8.

6-9. For the given reaction
C3H8 + 5O2 → 3CO2 + 4H2O
88 kg of C3H8 is reacting with 160 moles of O2.

6. What is extent of the reaction?
a) 1 mole
b) 2 moles
d) 3 moles
c) 4 moles

View Answer

Answer: a [Reason:] 1 mole of C3H8 is reacting and then extent of reaction = (2-1) / (1) = 1.

7. How many kg moles of C3H8 left in the reaction?
a) 1 mole
b) 2 moles
d) 3 moles
c) 4 moles

View Answer

Answer: a [Reason:] 1 mole of C3H8 is reacting. Left moles = 2-1 = 1.

8. How many kg of CO2 is produced?
a) 132
b) 88
d) 44
c) 22

View Answer

Answer: a [Reason:] CO2 produced = 3*44=132.

9. How many kg of H2O is produced?
a) 72
b) 36
d) 12
c) 6

View Answer

Answer: a [Reason:] H2O produced = 4*18 = 72.

10. How many moles of O2 are there in the reaction?
a) 0
b) 36
d) 72
c) 108

View Answer

Answer: a [Reason:] O2 is a limiting reactant.