Heat Engines Set 6 MCQs

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