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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