Mechanical Engineering Quiz 24

1 / 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

longitudinal stress

hoop stress

ultimate stress

2 / 50

Machine screws are________________?

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

similar to stud

used to prevent relative motion be-tween two parts

3 / 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

4 / 50

For economical operation of a nuclear plant__________________?

used fuel should be reprocessed

coolant should be employed

moderator should be used

control rods should be used

5 / 50

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

pascal

stoke

faraday

poise

6 / 50

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

corrosion caused by oxygen

pH value of water

heat transfer coefficient

cavitation of .boiler feed pumps

7 / 50

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

along PO

at 45? to PO

perpendicular to PO

none of the above

8 / 50

The percentage of carbon in low carbon steel is__________________?

0.50%

0.05%

0.30%

0.15%

9 / 50

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

1:01

2:01

4:01

1:06

10 / 50

Clearance volume in actual reciprocating compressors is essential __________________?

to provide cushioning effect

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

to attain high volumetric efficiency

to accommedate Valves in the cylinder head

11 / 50

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

125?

235?

200?

180?

12 / 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

13 / 50

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

babcock and wilcox boiler

cochran boiler

lancashire boiler

pulverised fuel fired boiler

14 / 50

Which type of boiler can meet rapid changes of load____________________?

horizontal fire tube type

vertical fire tube type

horizontal water tube type

forced circulation type

15 / 50

Machining properties of steel are improved by adding___________________?

chromium, nickel

silicon, aluminium, titanium

vanadium, aluminium

sulphur, lead, phosphorous

16 / 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

17 / 50

Pick up the false statement ?

Thermal efficiency of diesel engine i about 34%

S.I. engines are quality-governed engines

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

High speed compression engines operate on dual combustion cycle

18 / 50

Klein?s construction can be used when_________________?

crank has uniform angular velocity and angular acceleration

crank has non-uniform velocity

crank has a uniform angular velocity

crank has uniform angular acceleration

19 / 50

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

power to drive compressor to isothermal h.p.

isothermal h.p. to the BHP of motor

work to compress air isothermally to work for actual compression

isothermal h.p. to adiabatic h.p.

20 / 50

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

2500 kN/m2

245 kN/m2

25 kN/m2

2.5kN/m2

21 / 50

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

uniform flow

turbulent flow

one dimensional flow

steady flow

22 / 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

23 / 50

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

kinematically sound

soundness would depend upon which link is kept fixed

data is not sufficient to determine same

not sound

24 / 50

Two systems shall be dynamically equivalent when____________________?

all of the above

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

e.g. of two coincides

the mass of two are same

25 / 50

Euler?s dimensionless number relates the following__________________?

pressure force and inertial force

inertial force and gravity

viscous force and buoyancy force

viscous force and inertial force

26 / 50

Which of the following is a fire tube boiler________________?

Babcock and Wilcox boiler

locomotive boiler

Stirling boiler.

all of the above

27 / 50

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

fullering and caulking

reducing stress concentration

ease of manufacture

safety

28 / 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

steep

horizontal

nearly horizontal

29 / 50

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

air preheaters

heating of building in winter

none of the above

All

30 / 50

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

create vacuum in furnace

pump feed water

create vacuum at turbine exhaust

dose chemicals in feed water

31 / 50

Cupola produces following material__________________?

cast iron

pig iron

malleable iron

wrought iron

32 / 50

Scavenging is usually done to increase__________________?

thermal efficiency

speed

power output

fuel consumption

33 / 50

An event is indicated on the network by_________________?

a straight line

a straight line with circles at the ends

a dotted line

a number enclosed in a circle or a square

34 / 50

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

equal

depends on other factors

less

35 / 50

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

kcal/hr m2 ?C

kcal-m/hr ?C

kcal-m/hr m2 ?C

kcal/kg m2 ?C

36 / 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

37 / 50

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

tensile stress

transverse stress

compressive stress

internal resistanpe

38 / 50

In fast breeder reactors___________________?

heavy water is used as the moderator

graphite is used as the moderator

moderator is dispensed with

any type of moderator can be used

39 / 50

Highest pressure encountered in a refrigeration system should be________________?

near critical pressure

much above critical pressure

much below critical pressure

critical pressure of refrigerant

40 / 50

Method of governing used in petrol engine is________________?

combined governing

quality governing

quantity governing

partial governing

41 / 50

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

122?

152?

136?

40?

42 / 50

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

remains unchanged

increases/decreases depending on steam temperature requirements

decreases

increases

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___________________?

40 x 106 kg/cm2

400 kg/cm2

4000 kg/cm2

40 x 105 kg/cm2

44 / 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

45 / 50

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

421 kgm

539 kgm

421 kgm

102 kgm

46 / 50

The critical activity has____________________?

zero float,

maximum float

minimum float

average float

47 / 50

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

same

less

less or more depending on size of boiler

48 / 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

49 / 50

Which of the following organisation is preferred in automobile industry________________?

functional organisation

line organisation

line and staff organisations

staff organisation

50 / 50

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

remain unaffected

increase

decrease

may increase/decrease depending on compressor clearance

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