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This set of Heat Engines Multiple Choice Questions & Answers (MCQs) focuses on Heat Engines Set 6

Q1 | The power for the propulsion of ship is provided by
  • Diesel engines
  • Steam turbines
  • Either (A) and (B) above
  • Batteries
  • Any of the above
Q2 | The steam trap is used to
  • Superheat the steam
  • Separate condensate from steam
  • Convert superheated steam into the steam
  • Condense the steam
  • Add moisture to steam
Q3 | Piston ring are plated with chromium, cadmium or phosphate to
  • Reduce wear and eliminate scuffing
  • Improve heat transfer
  • Improve surface finish
  • Prevent clogging
  • Reduce clearance, between rings and cylinder
Q4 | More test is conducted on
  • Engines with two flywheels
  • Multi-cylinder engines
  • Single cylinder engines
  • High speed engines
  • Slow speed engines
Q5 | In oil burners air is supplied
  • To assist inflow of oil
  • To prevent clogging of burner
  • To improve combustion efficiency
  • To uniformly spray oil in combustion chamber
  • None of the above
Q6 | In a compression ignition engine higher combustion chamber wall temperature will
  • Reduce knocking tendency
  • Increase knocking tendency
  • Have no effect
  • Reduce exhaust temperature
  • None of the above
Q7 | Clapeyron equation is applicable
  • To systems in equilibrium
  • To change of boiling point
  • To change of melting point
  • For change of state when two phases are in equilibrium
  • All of the above
Q8 | In a system if base load is same as maximum demand, the load factor will be
  • 1
  • 1 percent
  • 0.5 percent
  • Infinity
  • Zero
Q9 | Reheating of steam for steam turbine cycle is done primarily to
  • Reduce dryness fraction of exhaust steam
  • Increase the pressure of steam in the condenser
  • Increase boiler chimney draught
  • Improve thermal efficiency of the plant
  • All of the above
Q10 | Morse test is conducted on
  • Multi-cylinder engines
  • Vertical engines
  • Horizontal engines
  • Vet engines
  • Single cylinder engines
Q11 | Capacitor kVA required to bring the power factor of a 500 kW load 70% to 85% would be
  • 100 kVA
  • 250 kVA
  • 300 kVA
  • 150 kVA
  • 200 kVA
Q12 | The function of a condenser in a steam power plant is
  • To preheat feed water with exhaust steam
  • To condense feed water
  • To utilise heat of exhaust steam
  • To act as a heat sink
  • To reduce back pressure
Q13 | For diatomic gas flowing through a nozzle the critical pressure ratio is given by
  • 0.75
  • 1
  • 3.546
  • 0.528
  • 0.577
Q14 | Suri-transmission is
  • hydro-mechanical
  • mechanical-electrical
  • Carbon dioxide
  • electro-pneumatic
  • hydro-pneumatic
Q15 | The temperature of the blades of a gas turbine may be closer to
  • 350?C
  • 212?C
  • 1200?C
  • 600?C
  • 100?C
Q16 | Compression ratio for diesel engines is generally in the range
  • 25 to 30
  • 5 to 10
  • 22 to 25
  • 14 to 22
  • 10 to 14
Q17 | In case of pressure compounded impulse turbine, for the steam while flowing through the nozzle of second stage
  • Pressure drops while velocity increases
  • Pressure increases while velocity decreases
  • Pressure and velocity both increase
  • Pressure increases
  • Pressure and velocity both decrease
Q18 | Which spark plug will have lower heat rating
  • W 350 T1
  • W 300 T1
  • W 95 T1
  • W 145 T1
  • W 225 T1
Q19 | In a petrol engine fuel lock generally occurs in
  • suction manifold
  • Carbon dioxide
  • inlet valve
  • Pump
  • gauge lines
Q20 | As per IS specifications the endurance test for engines is conducted for
  • 500 hours
  • 1000 hours
  • 100 hours
  • 300 hours
  • 200 hours
Q21 | In a pumping installation the suction line is is 4 metre long and suction pipe diameter is 100 mm. Now if the suction pipe is replaced by a pipe combination consisting of 2 metres of 100 mm diameter pipe joined with 2 metres of 150 mm diameter pipe, the suction heat will become
  • 6 metres
  • 4 metres
  • 2 metres
  • 1 metre
  • None of the above
Q22 | Standard air is air at
  • Atmospheric conditions at any specific location
  • 1 kg/cm2 and atmospheric temperature (Relative humidity of 64%)
  • 1 kg/cm2 and 20?C (Relative humidity of 36%)
  • 1 kg/cm2 and 0?C (Relative humidity of 36%)
  • None of the above
Q23 | Which of the following is not needed in case of magneto ignition?
  • Coil
  • Capacitor
  • Distributor
  • Battery
  • Spark plug
Q24 | During detonation in a petrol engine
  • The rate of speed variation is high
  • The rate of exhaust discharge is high
  • The rate of temperature rise is high
  • The rate of pressure rise is high
  • None of the above
Q25 | Volume of air at 27?C is 2 cu-m. What will be the volume at 327?C
  • 3 cm-m
  • 12 cm-m
  • 4 cu-m
  • 2 cu-m
  • 8 cu-m