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UPPSC Lec’21 ME: Daily Practices Quiz. 08-Oct-2021

Quiz: Mechanical Engineering
Exam: UPPSC Lecturer
Topic: Miscellaneous

Each question carries 1 mark
Negative marking: 1/4 mark
Time: 6 Minutes

Q1. Consider the following statements:
1.Thermodynamics properties are the macroscopic coordinates significant only for systems existing in states of thermodynamic equilibrium.
2.Engineering thermodynamics studies about transfer and transformation energy.
3.Engineering thermodynamics studies about storage, transfer and transformation of energy.
Which of the above statements is/are true?
(a) 3 only
(b) 1 and 3
(c) 2 only
(d) 1 and 2

Q2. In which one of the following materials, is the heat energy propagation minimum due to conduction heat transfer?
(b) Copper
(c) Water
(d) Air

Q3. The fundamental unit of enthalpy is
(a) MLT^(-2)
(b) ML^2 T^(-1)
(c) ML^2 T^(-2)
(d) ML^3 T^(-2)

Q4. An unbound solution of linear programming problem is reflected in the simplex method, when
(a) All the ratio of ‘right-hand sides’ to coefficients in key column become negative
(b) All the ratios of right-hand sides to coefficients in key columns become zero
(c) All right-hand sides become negative
(d) All right hand become zero

Q5. The Kelvin temperature of a system can be measured by
(a) mercury in glass thermometer
(b) thermocouple
(c) constant volume gas thermometer
(d) resistance thermometer

Q6. The function of washer is to______________.
(a) provide cushioning effect
(b) provide bearing area
(c) absorb shocks and vibrations
(d) provide smooth surface in place of rough surface

Solutions

S1. Ans (b)
Sol. Thermodynamics properties are the macroscopic coordinates significant only for systems existing in states of thermodynamic equilibrium. Engineering thermodynamics studies about storage, transfer and transformation of energy.

S2. Ans.(d)
Sol. Due to minimum thermal conductivity of air heat conduction is minimum in air.

S3. Ans (c)
Sol. Unit of enthalpy is Joule.
Joule=N-m
N=kg-m/s^2
Joule= kg-m^2/s^2
Hence, Fundamental unit of Joule= ML^2 T^(-2)

S4. Ans.(a)
Sol.

Unbounded Solution: If the feasible region is not bounded, it is possible that the value of the objective function goes on increasing without leaving the feasible region. This is known as unbounded solution.

S5. Ans (c)
Sol. The Kelvin temperature of a system can be measured by a constant volume gas thermometer.
Constant volume gas thermometer works on the principle of Gay-Lussac’s law, which states that P/T=Constant
Thermometry equation for constant volume gas thermometer,
T=273.16.P/P_t
Here,
T=Unknown temperature
P=Known pressure corresponding to T
P_t= pressure corresponding to triple point of water (=273.16 K)

S6. Ans.(b)
Sol. Function of the washer-
To lock the nut and keep it at its place’

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