On This Page
This set of Heat Engines Multiple Choice Questions & Answers (MCQs) focuses on Heat Engines Set 17
Q1 | The self-ignition temperature of diesel oil as compared to petrol is
- Higher
- Varies considerably
- Lower
- Depends on other factors
- Same
Q2 | Rank of coal is based on
- Fixed carbon and heating value
- Ash content
- Ash and moisture content
- Size
- None of the above
Q3 | Piston rings are made of
- Aluminium
- Carbon steel
- Alloy steel
- Copper
- Cast iron
Q4 | This purpose of supercharging an engine is
- To increase the power output of engine
- To reduce specific fuel consumption
- To reduce the noise of engine
- To improve cooling of cylinders
- None of the above
Q5 | The lowest temperatures that can be measured by a gas thermometer using nitrogen is
- ? 100?C
- 0?C
- ? 200?C
- ? 10?C
- ? 137?C
Q6 | Gusset stays are provided in
- Steam turbines
- Steam condensers
- Chimney
- Boilers
- Steam engines
Q7 | One kg of octane is burnt by four alternative processes given below. In which case the work available will be maximum?
- When burnt in an open pan in atmosphere
- When burnt in an internal combustion engine
- When burnt in a fuel cell
- When burnt in a reversible process
- None of the above
Q8 | For superheated steam in a nozzle the critical pressure ratio is
- 0.528
- 0.546
- 0.64
- 0.577
- 1
Q9 | Dark, black smoke from diesel engines usually results when the engine is
- Idling
- Running at slow speeds
- Running at full speed but under no load conditions
- Running at full load and full speed
- Running at light loads
Q10 | A starting motor should have capacity to generate power equal to
- IHP
- IHP-BHP
- BHP
- Friction horse power at cranking r.p.m
- Friction horse power
Q11 | Water gas is a mixture of
- CO2 and N2
- CO and H2
- SO2, CO2 and N2
- N2 and H2
- CO, CO2 and SO2
Q12 | A jet engine has
- Propeller in front
- Propeller in back
- One propeller in front and one propeller in back
- No propeller
- None of the above
Q13 | A Lenoir cycle has a top temperature in the cycle
- More than that of Otto cycle
- Equal to diesel cycle
- Weight of engine
- Between Otto and diesel cycles
- Less than diesel cycle
Q14 | In isochronous governors the speed drop is
- 50 percent
- 75 percent
- 10 percent
- 20 percent
- Zero
Q15 | In a Diesel engine the duration between the time of injection and time of ignition is called
- Explosion period
- Delay period
- Period of ignition
- Pre-ignition period
- Burning period
Q16 | All but one of the following possible steam generator test difficulties would cause the apparent performance to be poorer than it actually is. One item would make the performance look better than it really is. Identify the item
- Steam flow meter reads low
- Steam temperature gauge reads too high
- HHV of fuel is determined incorrectly, being too high
- Coad scales are inaccurate, reading high
- None of the above
Q17 | Resilience is the property of materials in which
- Materials resist deformation
- Materials spring back or recoil when pressure is removed
- Materials are easily deformed
- Materials can be easily pressed
- None of the above
Q18 | Thermie
- Is quantity of heat required to raise temperature of one tonne of water from 14.5?C to 15.5?C
- Is a unit of latent heat measurement
- Is thermal conductivity of materials
- Is a unit of temperature measurement
- Is the temperature change in water when 1000 calories of heat are added to 1 gm of water, gradually
Q19 | Induced draft fan for a boiler is always located
- Near the cooling tower
- At the foot of the chimney
- Near the coal hopper
- Near the water treatment
- On the top of the chimney
Q20 | Intercooling in multistage compressors is done
- To supply-air at two different pressures for use
- To cool air during compression
- To cool the air at delivery
- To enable use of small cylinders and eliminate problems of unbalanced forces
- To minimise the work of compression
Q21 | Which of the following is an important consideration in the design of turbine blades?
- Creep
- Shape
- Exhaust temperature
- Air-fuel ratio
- None of the above
Q22 | Sensible heat is
- That heat which causes change of state
- That heat which produces a rise of temperature
- That heat which produces a rise of temperature
- That can only be sensed by a thermometer
- None of the above
Q23 | The effieincy of a diesel cycle increases with
- increase in cut off
- decrease in cut off
- decrease in compression ratio
- None of the above
- Carbon dioxide
Q24 | In a throttle governed steam engine
- Admission pressure is reduced while cut off remains unaltered
- Admission pressure remains constant while cut off is altered
- Admission pressure and cut off both are altered
- Admission pressure is varied while cut off remains unaltered
- Neither admission pressure nor cut off is altered
Q25 | For gas turbines compressors used are
- Centrifugal type
- Lobe type
- Axial flow type
- Sliding vane type
- Reciprocating type