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MCQs

Total Questions : 1058 | Page 1 of 106 pages
Question 1. Stirling cycle consists of
  1.     Two constant volume and two isentropic processes
  2.     Two constant volume and two isothermal processes
  3.     Two constant pressure and two isothermal processes
  4.     One constant volume, one constant pressure and two isentropic processes
 Discuss Question
Answer: Option B. ->  Two constant volume and two isothermal processes
Question 2. The efficiency of the carnot cycle is (where t1 and t2 = highest and lowest temperature during the cycle)
  1.     (T1/T2) - 1
  2.     1 - (T1/T2)
  3.     1 - (T2/T1)
  4.     1 + (T2/T1)
 Discuss Question
Answer: Option C. ->  1 - (T2/T1)
Question 3. When cut-off ratio is ________; the efficiency of diesel cycle approaches to otto cycle efficiency
  1.     1/4
  2.     Zero
  3.     1/5
  4.     2
 Discuss Question
Answer: Option B. ->  Zero
Question 4. The compression ratio is the ratio of
  1.     Total volume to swept volume
  2.     Swept volume to clearance volume
  3.     Swept volume to total volume
  4.     Total volume to clearance volume
 Discuss Question
Answer: Option D. ->  Total volume to clearance volume
Question 5. Change in internal energy in a closed system is equal to heat transferred if the reversible process takes place at constant
  1.     Pressure
  2.     Temperature
  3.     Volume
  4.     Internal energy
 Discuss Question
Answer: Option C. ->  Volume
Question 6. An ideal gas as compared to a real gas at very high pressure occupies
  1.     More volume
  2.     Less volume
  3.     Same volume
  4.     Unpredictable behavior
 Discuss Question
Answer: Option A. ->  More volume
Question 7. For the same compression ratio, the efficiency of diesel cycle is __________ otto cycle.
  1.     Greater than
  2.     Less than
  3.     Equal to
  4.     None of these
 Discuss Question
Answer: Option B. ->  Less than
Question 8. The thermal efficiency of an ideal gas turbine plant is given by (where r = pressure ratio)
  1.     rγ - 1
  2.     1 - rγ - 1
  3.     1 - (1/r) γ/γ - 1
  4.     1 - (1/r) γ - 1/ γ
 Discuss Question
Answer: Option D. ->  1 - (1/r) γ - 1/ γ
Question 9. The process is adiabatic, if the value of n in the equation pvn = c, is
  1.     Zero
  2.     One
  3.     γ
  4.     ∝
 Discuss Question
Answer: Option C. ->  γ
Question 10. Entropy change depends on
  1.     Heat transfer
  2.     Mass transfer
  3.     Change of temperature
  4.     Thermodynamic state
 Discuss Question
Answer: Option A. ->  Heat transfer

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