Mechanical Engineering Quiz 24

1 / 50

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

steady flow

turbulent flow

uniform flow

one dimensional flow

2 / 50

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

air preheaters

none of the above

All

heating of building in winter

3 / 50

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

539 kgm

421 kgm

102 kgm

421 kgm

4 / 50

Which of the following organisation is preferred in automobile industry________________?

line and staff organisations

functional organisation

staff organisation

line organisation

5 / 50

Highest pressure encountered in a refrigeration system should be________________?

much above critical pressure

much below critical pressure

critical pressure of refrigerant

near critical pressure

6 / 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

7 / 50

The percentage of carbon in low carbon steel is__________________?

0.30%

0.50%

0.05%

0.15%

8 / 50

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

245 kN/m2

2.5kN/m2

2500 kN/m2

25 kN/m2

9 / 50

An event is indicated on the network by_________________?

a number enclosed in a circle or a square

a dotted line

a straight line with circles at the ends

a straight line

10 / 50

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

compressive stress

internal resistanpe

tensile stress

transverse stress

11 / 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

12 / 50

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

poise

stoke

pascal

faraday

13 / 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

hoop stress

ultimate stress

longitudinal stress

14 / 50

Which type of boiler can meet rapid changes of load____________________?

forced circulation type

horizontal water tube type

horizontal fire tube type

vertical fire tube type

15 / 50

Which of the following is a fire tube boiler________________?

locomotive boiler

all of the above

Stirling boiler.

Babcock and Wilcox boiler

16 / 50

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

equal

less

depends on other factors

17 / 50

Two systems shall be dynamically equivalent when____________________?

the mass of two are same

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

all of the above

e.g. of two coincides

18 / 50

In fast breeder reactors___________________?

moderator is dispensed with

heavy water is used as the moderator

any type of moderator can be used

graphite is used as the moderator

19 / 50

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

not sound

kinematically sound

soundness would depend upon which link is kept fixed

data is not sufficient to determine same

20 / 50

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

may increase/decrease depending on compressor clearance

increase

decrease

remain unaffected

21 / 50

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

152?

136?

40?

122?

22 / 50

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

180?

235?

200?

125?

23 / 50

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

create vacuum in furnace

dose chemicals in feed water

pump feed water

create vacuum at turbine exhaust

24 / 50

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

safety

reducing stress concentration

fullering and caulking

ease of manufacture

25 / 50

Klein?s construction can be used when_________________?

crank has uniform angular acceleration

crank has uniform angular velocity and angular acceleration

crank has a uniform angular velocity

crank has non-uniform velocity

26 / 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________________?

0.7 times

0.6 times

0.4 times

0.8 times

27 / 50

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

perpendicular to PO

none of the above

at 45? to PO

along PO

28 / 50

Euler?s dimensionless number relates the following__________________?

viscous force and inertial force

viscous force and buoyancy force

inertial force and gravity

pressure force and inertial force

29 / 50

According to Clausis statement of second law of thermodynamics___________________?

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

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

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

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

30 / 50

Pressurised water reactor is designed________________?

to use liquid sodium metal as coolant

to use intermediate coolant

to prevent the water coolant from boiling in the core

for boiling pi water in the core

31 / 50

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

corrosion caused by oxygen

cavitation of .boiler feed pumps

pH value of water

heat transfer coefficient

32 / 50

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

1:03

9:01

1:09

1:01

33 / 50

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

isothermal h.p. to the BHP of motor

power to drive compressor to isothermal h.p.

isothermal h.p. to adiabatic h.p.

work to compress air isothermally to work for actual compression

34 / 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

1:06

2:01

35 / 50

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

horizontal

first rise and then fall

nearly horizontal

steep

36 / 50

Pick up the false statement ?

Thermal efficiency of diesel engine i about 34%

High speed compression engines operate on dual combustion cycle

S.I. engines are quality-governed engines

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

37 / 50

The critical activity has____________________?

zero float,

average float

minimum float

maximum float

38 / 50

Machining properties of steel are improved by adding___________________?

vanadium, aluminium

sulphur, lead, phosphorous

chromium, nickel

silicon, aluminium, titanium

39 / 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___________________?

4000 kg/cm2

40 x 105 kg/cm2

40 x 106 kg/cm2

400 kg/cm2

40 / 50

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

pulverised fuel fired boiler

lancashire boiler

cochran boiler

babcock and wilcox boiler

41 / 50

Cavitation will begin when__________________?

flow is increased

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

pressure becomes more than critical pressure

pressure is increased

42 / 50

Cupola produces following material__________________?

cast iron

pig iron

wrought iron

malleable iron

43 / 50

Clearance volume in actual reciprocating compressors is essential __________________?

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

to provide cushioning effect

to attain high volumetric efficiency

to accommedate Valves in the cylinder head

44 / 50

For economical operation of a nuclear plant__________________?

control rods should be used

moderator should be used

used fuel should be reprocessed

coolant should be employed

45 / 50

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

kcal/kg m2 ?C

kcal-m/hr ?C

kcal/hr m2 ?C

kcal-m/hr m2 ?C

46 / 50

Scavenging is usually done to increase__________________?

speed

thermal efficiency

power output

fuel consumption

47 / 50

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

may be less or more depending on temperature

less

equal

48 / 50

Method of governing used in petrol engine is________________?

partial governing

quantity governing

combined governing

quality governing

49 / 50

Pick up the correct statement from the following?

all of the above

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

critical path method provides a realistic approach to the daily problems

critical path method is an improvement upon bar chart method

50 / 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

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