Power Engineering and Refrigeration (PER)



1   In a four stroke cycle petrol engine, the pressure inside the engine cylinder during the suction stroke is __________ the atmospheric pressure.
    (A)   Equal to
    (B)   Below
    (C)   Above
    (D)   None of these

2   If the temperature of intake air in internal combustion engine increases, then its efficiency will
    (A)   Remain same
    (B)   Decrease
    (C)   Increase
    (D)   None of these

3   The ignition quality of petrol is expressed by
    (A)   Cetane number
    (C)   Octane number
    (D)   Calorific value
    (B)   All of these

4   Theoretically, a four stroke cycle engine should develop _________ power as that of a two stroke cycle engine.
    (A)   Half
    (B)   Same
    (C)   Double
    (D)   four times

5   At which stroke the fuel is injected in the CI engine?
    (A)   Suction stroke
    (B)   Compression stroke
    (C)   Expansion stroke
    (D)   Exhaust stroke

6   The air standard efficiency of an I.C. engine depends on _____________
    (A)   fuel used
    (B)   speed of engine
    (C)   compression ratio
    (D)   none of the mentioned

7   The Carnot cycle consists of
    (A)   Two isothermal and two adiabatic processes
    (B)   Two isothermal and two constant volume processes
    (C)   Two isothermal and two constant pressure processes
    (D)   Two isothermal and two isenthalpic processes

8   In a four stroke cycle diesel engine, the exhaust valve
    (A)   Opens at 30° before bottom dead centre and closes at 10° after top dead centre
    (B)   Opens at 30° after bottom dead centre and closes at 10° before top dead centre
    (C)   Opens at bottom dead centre and closes at top dead centre
    (D)   May open and close anywhere

9   The knocking tendency in spark ignition engines may be decreased by
    (A)   Controlling the air-fuel mixture
    (B)   Controlling the ignition timing
    (C)   Controlling the exhaust temperature
    (D)   Reducing the compression ratio

10   The colour of exhaust from diesel engine is generally
    (A)   White
    (B)   Bluish
    (C)   Black
    (D)   Violet

11   What are the types of Multi-Point Fuel Injection System?
    (A)   Port injection
    (B)   Throttle body injection
    (C)   Port & throttle body injection
    (D)   None of the mentioned

12   What can be reduced by using Exhaust gas recirculation (EGR)?
    (A)   CO
    (B)   NOx
    (C)   HC
    (D)   CO & HC

13   The purpose of Supercharging is to
    (A)   Increase compression ratio
    (C)   Utilize exhaust gas energy
    (D)   Increase charge density
    (B)   Increase speed of engine

14   The purpose of testing an internal combustion engine is
    (A)   To determine the information, which cannot be obtained by calculations
    (B)   To conform the data used in design, the validity of which may be doubtful
    (C)   To satisfy the customer regarding the performance of the engine
    (D)   All of the above

15   The ratio of the volume of charge admitted at N.T.P. to the swept volume of the piston is called
    (A)   Mechanical efficiency
    (B)   Overall efficiency
    (C)   Volumetric efficiency
    (D)   Relative efficiency

16   The power actually developed by the engine cylinder of an I.C. engine is known as
    (A)   Theoretical power
    (B)   Actual power
    (C)   Indicated power
    (D)   None of these

17   In the four cylinder engine, the ECU calculates
    (A)   Appropriate injection timing for each cylinder
    (B)   the air fuel mixture is made available at each suction stroke.
    (C)   Both a and b
    (D)   None of these.

18   Which technology changes the timing of intake/exhaust valves when the engine is running?
    (A)   CRDI
    (B)   DOHC
    (C)   TDI
    (D)   VVTi

19   Diesel common rail direct injection (CRDI) benefits
    (A)   Reduction of exhaust and noise emissions
    (B)   Better fuel efficiency
    (C)   Improved overall engine performance.
    (D)   All a, b & c

20   Which statement about a catalyst is incorrect?
    (A)   The presence of a catalyst speeds up a reaction.
    (B)   The presence of a catalyst changes the rate of a reaction.
    (C)   In some reactions, one of the products acts as a catalyst for the forward reaction.
    (D)   During use, a catalyst may be poisoned.

21   Morse test is used to determine the Indicated Power of a
    (A)   Single cylinder petrol engine
    (B)   Four stroke engine
    (C)   Single cylinder diesel engine
    (D)   Multi cylinder engine

22   What are the challenges faced with the BS-VI rollout In India?
    (A)   Development to making the new engines
    (B)   Manufacturing processes
    (C)   Raw material
    (D)   None of the above.

23   _____________ is the difference between indicated and brake power of an engine.
    (A)   Air flow
    (C)   Emissions
    (D)   Friction power
    (B)   None of the mentioned

24   The brake power of engine is available
    (A)   In the engine cylinder
    (B)   At the crank shaft
    (C)   At the crank pin
    (D)   None of these

25   The theoretically correct air fuel ratio for petrol engine is of the order of____________
    (A)   6:01
    (B)   9:01
    (C)   12:01
    (D)   15:01

26   An engine indicator is used to determine the following
    (A)   Speed
    (B)   Temperature
    (C)   Volume of cylinder
    (D)   m.e.p. and I.H.P.

27   Mechanical efficiency of I C Engine is the ratio of
    (A)   Brake power to Indicated power
    (B)   Friction power to Indicated power
    (C)   Friction power to Indicated power
    (D)   Indicated power to Brake power

28   What is major difference between BS-IV and BS-VI norms?
    (A)   BS-IV contains 80 ppm sulphur and BS-VI contains 60 ppm sulphur.
    (B)   BS-IV contains 100 ppm sulphur and BS-VI contains 90 ppm sulphur.
    (C)   BS-IV contains 50 ppm sulphur and BS-VI contains 10 ppm sulphur.
    (D)   BS-IV contains 150 ppm sulphur and BS-VI contains 120 ppm sulphur.