Are you guys looking for Mechanical Engineering MCQ Questions with Answers PDF Free Download as per Mechanical Engineering new exam pattern? You came to the right page. This may assist you to understand and check your knowledge about the Subjects. Students also can take a free test of the Multiple Choice Questions of Mechanical Engineering. Each question has four options followed by the right answer. These Mechanical Engineering MCQ Questions are selected supported by the newest exam pattern.
Q1. The radiation emitted by a black body is known as
(A) Black radiation
(B) Full radiation
(C) Total radiation
(D) All of these
Answer: (D) All of these
Q2. If the energy radiated per second per sq. cm. of the surface for wave lengths lying between λ, and λ + dλ is represented by (eλ.dλ), then eλ is called
(A) Absorptive power
(B) Emissive power
(C) Emissivity
(D) None of these
Answer: (B) Emissive power
Q3. Film coefficient is defined as the ratio of
(A) Thermal conductivity to the equivalent thickness of the film of fluid
(B) Temperature drop through the films of fluids to the thickness of film of fluids
(C) Thickness of film of fluid to the thermal conductivity
(D) Thickness of film of fluid to the temperature drop through the films of fluids
Answer:(A) Thermal conductivity to the equivalent thickness of the film of fluid
Q4. The rate of heat flow through a body is Q = [kA (T₁ – T₂)]/x. The term x/kA is known as
(A) Thermal coefficient
(B) Thermal resistance
(C) Thermal conductivity
(D) None of these
Answer: (B) Thermal resistance
Q5. The heat transfer from a hot body to a cold body is directly proportional to the surface area and difference of temperatures between the two bodies. This statement is called
(A) First law of thermodynamics
(B) Newton’s law of cooling
(C) Newton’s law of heating
(D) Stefan’s law
Answer: (B) Newton’s law of cooling
Q6. The emissivity for a black body is
(A) 0
(B) 0.5
(C) 0.75
(D) 1
Answer: (D) 1
Q7. The transfer of heat by molecular collision is smallest in
(A) Solids
(B) Liquids
(C) Gases
(D) None of these
Answer: (C) Gases
Q8. 40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is
(A) 0.45
(B) 0.55
(C) 0.40
(D) 0.75
Answer: (A) 0.45
Q9. Heat transfer takes place as per
(A) Zeroth law of thermodynamics
(B) First law of thermodynamic
(C) Second law of the thermodynamics
(D) Kirchoff’s law
Answer: (C) Second law of the thermodynamics
Q10. Metals are good conductors of heat because
(A) Their atoms collide frequently
(B) Their atoms are relatively far apart
(C) They contain free electrons
(D) They have high density
Answer: (A) Their atoms collide frequently
Q11. Heat flows from one body to other when they have
(A) Different heat contents
(B) Different specific heat
(C) Different atomic structure
(D) Different temperatures
Answer: (D) Different temperatures
Q12. Heat is transferred by all three modes of transfer, viz. conduction, convection and radiation in
(A) Electric heater
(B) Steam condenser
(C) Boiler
(D) Refrigerator condenser coils
Answer: (C) Boiler
Q13. Emissivity of a white polished body in comparison to a black body is
(A) Higher
(B) Lower
(C) Same
(D) Depends upon the shape of body
Answer: (B) Lower
Q14. All radiations in a black body are
(A) Reflected
(B) Refracted
(C) Transmitted
(D) Absorbed
Answer: (D) Absorbed
Q15. According to Stefan Boltzmann law, ideal radiators emit radiant energy at a rate proportional to
(A) Absolute temperature
(B) Square of temperature
(C) Fourth power of absolute temperature
(D) Fourth power of temperature
Answer:(C) Fourth power of absolute temperature
Q16. According to Wien’s law, the wavelength corresponding to maximum energy is proportion to
(A) Absolute temperature (T)
(B) I²
(C) F
(D) T
Answer: (A) Absolute temperature (T)
Q17. Thermal conductivity of water at 20°C is of the order of
(A) 0.1
(B) 0.23
(C) 0.42
(D) 0.51
Answer:(D) 0.51
Q18. In heat exchangers, degree of approach is defined as the difference between temperatures of
(A) Cold water inlet and outlet
(B) Hot medium inlet and outlet
(C) Hot medium outlet and cold water inlet
(D) Hot medium outlet and cold water outlet
Answer: (D) Hot medium outlet and cold water outlet
Q19. The amount of radiation mainly depends on
(A) Nature of body
(B) Temperature of body
(C) Type of surface of body
(D) All of the above
Answer: (D) All of the above
Q20. The heat transfer by conduction through a thick sphere is given by
(A) Q = 2πkr1 r2 (T1 – T2)/ (r2 – r1)
(B) Q = 4πkr1 r2 (T1 – T2)/ (r2 – r1)
(C) Q = 6πkr1 r2 (T1 – T2)/ (r2 – r1)
(D) Q = 8πkr1 r2 (T1 – T2)/ (r2 – r1)
Answer: (B) Q = 4πkr1 r2 (T1 – T2)/ (r2 – r1)
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Heat and Mass Transfer – Set 08