Mechanical Engineering Quiz 24

1 / 50

As the value of index ??? is decreased, the volumetric efficiency will___________________?

decrease

remain unaffected

may increase/decrease depending on compressor clearance

increase

2 / 50

Cavitation will begin when__________________?

pressure is increased

pressure becomes more than critical pressure

the pressure at any location reaches an absolute pressure equal to the saturated vapour pressure of the liquid

flow is increased

3 / 50

Which of the following is a case of steady state heat transfer ___________________?

heating of building in winter

none of the above

air preheaters

All

4 / 50

Which of the following organisation is preferred in automobile industry________________?

staff organisation

line organisation

functional organisation

line and staff organisations

5 / 50

Mechanical equivalent of heat for 1 kcal or Joule?s equivalent is equal to_________________?

421 kgm

102 kgm

539 kgm

421 kgm

6 / 50

Klein?s construction can be used when_________________?

crank has non-uniform velocity

crank has uniform angular velocity and angular acceleration

crank has uniform angular acceleration

crank has a uniform angular velocity

7 / 50

An event is indicated on the network by_________________?

a number enclosed in a circle or a square

a straight line

a dotted line

a straight line with circles at the ends

8 / 50

The force acting along the circumference will cause stress in the walls in a direction normal to the longitudinal axis of cylinder; this stress is called___________________?

yeiled stress

ultimate stress

longitudinal stress

hoop stress

9 / 50

Pick up the false statement ?

Thermal efficiency of diesel engine i about 34%

Theoretically correct mixture of air am petrol is approximately 15 : 1

S.I. engines are quality-governed engines

High speed compression engines operate on dual combustion cycle

10 / 50

For standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in tension, if the height of nut (h) is approximately________________?

0.8 times

0.4 times

0.7 times

0.6 times

11 / 50

The latent heat of steam at pressures greater than atmospheric in comparison to latent heat at atmospheric pressure is__________________?

less

may be less or more depending on temperature

equal

12 / 50

Pressurised water reactor is designed________________?

to prevent the water coolant from boiling in the core

to use liquid sodium metal as coolant

for boiling pi water in the core

to use intermediate coolant

13 / 50

The percentage of carbon in low carbon steel is__________________?

0.15%

0.05%

0.50%

0.30%

14 / 50

Method of governing used in petrol engine is________________?

quality governing

quantity governing

partial governing

combined governing

15 / 50

If both Stirling and Carnot cycles operate within the same temperature limits, then efficiency of Stirling cycle as compared to Carnot cycle___________________?

depends on other factors

less

equal

16 / 50

The critical activity has____________________?

average float

zero float,

maximum float

minimum float

17 / 50

The absolute acceleration of any point P in a link about center of rotation 0 is___________________?

at 45? to PO

along PO

none of the above

perpendicular to PO

18 / 50

Which of the following is the unit of kinematic viscosity _________________?

faraday

poise

stoke

pascal

19 / 50

Which of the following is a fire tube boiler________________?

all of the above

Stirling boiler.

Babcock and Wilcox boiler

locomotive boiler

20 / 50

The size of a boiler drum in pulverised fuel fired boiler,as its size and capacity, (steam pressure and flow ratings) increase __________________?

increases/decreases depending on steam temperature requirements

remains unchanged

decreases

increases

21 / 50

According to Clausis statement of second law of thermodynamics___________________?

heat can be transferred from low temperature to high temperature source if COP of process is more than unity

heat can be transferred for low temperature to high temperature source by using refrigeration cycle.

heat can?t be transferred from low temperature to high temperature source without the aid of external energy

heat can?t be transferred from low temperature source to high temperature source

22 / 50

For economical operation of a nuclear plant__________________?

moderator should be used

used fuel should be reprocessed

coolant should be employed

control rods should be used

23 / 50

The capacity of induced draft fan compared to forced draft fan in a boiler is__________________?

less or more depending on size of boiler

same

less

24 / 50

It equal and opposite forces applied to a body tend to elongate it, the stress so produced is called______________________?

tensile stress

internal resistanpe

compressive stress

transverse stress

25 / 50

Mass flow ratio of NH3 in comparison to Freon-12 for same refrigeration load and same temperature limits is of the order of___________________?

9:01

1:01

1:03

1:09

26 / 50

Cupola produces following material__________________?

cast iron

pig iron

wrought iron

malleable iron

27 / 50

Two systems shall be dynamically equivalent when____________________?

M.I. of two about an axis through e.g. is equal

e.g. of two coincides

all of the above

the mass of two are same

28 / 50

Highest pressure encountered in a refrigeration system should be________________?

much below critical pressure

much above critical pressure

critical pressure of refrigerant

near critical pressure

29 / 50

In fast breeder reactors___________________?

any type of moderator can be used

heavy water is used as the moderator

graphite is used as the moderator

moderator is dispensed with

30 / 50

A typewriter mechanism has 7 number of binary joints, six links and none of higher pairs. The mechanism is________________?

not sound

soundness would depend upon which link is kept fixed

kinematically sound

data is not sufficient to determine same

31 / 50

Machine screws are________________?

similar to stud

used to prevent relative motion be-tween two parts

similar to small size tap bolts except that a greater variety of shapes of heads are available

slotted for a screw driver and generally used with a nut

32 / 50

In Vicker?s hardness testing, the pyramid indentor apex is__________________?

136?

40?

122?

152?

33 / 50

Unit of thermal conductivity in M.K.S. units is ___________________?

kcal/hr m2 ?C

kcal-m/hr m2 ?C

kcal/kg m2 ?C

kcal-m/hr ?C

34 / 50

When a piping system is made up primarily of friction head and very little of vertical lift, then pump characteristics should be__________________?

first rise and then fall

nearly horizontal

horizontal

steep

35 / 50

A pressure of 25 m of head of water is equal to_________________?

2500 kN/m2

2.5kN/m2

25 kN/m2

245 kN/m2

36 / 50

Scavenging is usually done to increase__________________?

thermal efficiency

speed

power output

fuel consumption

37 / 50

The flow in which the velocity vector is identical in magnitude and direction at every point, for any given instant, is known as________________?

turbulent flow

uniform flow

steady flow

one dimensional flow

38 / 50

The overall isothermal eiffciency of compressor is defined as the ratio of_______________?

isothermal h.p. to adiabatic h.p.

isothermal h.p. to the BHP of motor

work to compress air isothermally to work for actual compression

power to drive compressor to isothermal h.p.

39 / 50

Which type of boiler can meet rapid changes of load____________________?

horizontal fire tube type

vertical fire tube type

forced circulation type

horizontal water tube type

40 / 50

The inlet value of a four stroke cycle I.C engine remains open for nearly___________________?

200?

235?

125?

180?

41 / 50

Euler?s dimensionless number relates the following__________________?

viscous force and buoyancy force

viscous force and inertial force

pressure force and inertial force

inertial force and gravity

42 / 50

Deaeration of feed water is carried out because it reduces ____________________?

cavitation of .boiler feed pumps

corrosion caused by oxygen

heat transfer coefficient

pH value of water

43 / 50

A liquid compressed in cylinder has a volume of 0.04 m3 at 50 kg/cm2 and a volume of 0.039 m3 at 150 kg/cm2. The bulk modulus of elasticity of liquid is___________________?

400 kg/cm2

40 x 106 kg/cm2

4000 kg/cm2

40 x 105 kg/cm2

44 / 50

Pick up the correct statement from the following?

critical path method is an improvement upon bar chart method

critical path method provides a realistic approach to the daily problems

critical path method avoids delays which are very common in bar chart

all of the above

45 / 50

The edges of the plates for cylindrical vessels are usually bevelled to an angle of 80? for_________________?

safety

ease of manufacture

reducing stress concentration

fullering and caulking

46 / 50

Machining properties of steel are improved by adding___________________?

sulphur, lead, phosphorous

chromium, nickel

vanadium, aluminium

silicon, aluminium, titanium

47 / 50

It is required to produce large amount of steam at low pressure. Which boiler should be used ?

lancashire boiler

babcock and wilcox boiler

pulverised fuel fired boiler

cochran boiler

48 / 50

Clearance volume in actual reciprocating compressors is essential __________________?

to provide cushioning effect

to attain high volumetric efficiency

to provide cushioning effect and also to avoid mechanical bang of piston with cylinder head

to accommedate Valves in the cylinder head

49 / 50

The function of injector used in small steam plants is to________________?

create vacuum at turbine exhaust

dose chemicals in feed water

pump feed water

create vacuum in furnace

50 / 50

The ratio of specific weighf/h.p. of gas turbin and I.C engines may be typically of the order of_______________________?

4:01

1:01

2:01

1:06

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