Mechanical Engineering Quiz 24

1 / 50

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

transverse stress

tensile stress

internal resistanpe

compressive stress

2 / 50

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

poise

stoke

faraday

pascal

3 / 50

The percentage of carbon in low carbon steel is__________________?

0.05%

0.50%

0.30%

0.15%

4 / 50

Pressurised water reactor is designed________________?

for boiling pi water in the core

to use liquid sodium metal as coolant

to use intermediate coolant

to prevent the water coolant from boiling in the core

5 / 50

Cupola produces following material__________________?

wrought iron

malleable iron

pig iron

cast iron

6 / 50

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

pH value of water

cavitation of .boiler feed pumps

heat transfer coefficient

corrosion caused by oxygen

7 / 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

8 / 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________________?

0.4 times

0.6 times

0.7 times

0.8 times

9 / 50

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

kcal-m/hr ?C

kcal-m/hr m2 ?C

kcal/kg m2 ?C

kcal/hr m2 ?C

10 / 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

11 / 50

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

along PO

perpendicular to PO

at 45? to PO

none of the above

12 / 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

4000 kg/cm2

40 x 106 kg/cm2

40 x 105 kg/cm2

13 / 50

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

soundness would depend upon which link is kept fixed

data is not sufficient to determine same

not sound

kinematically sound

14 / 50

Which type of boiler can meet rapid changes of load____________________?

forced circulation type

vertical fire tube type

horizontal fire tube type

horizontal water tube type

15 / 50

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

40?

136?

122?

152?

16 / 50

Which of the following is a fire tube boiler________________?

Stirling boiler.

locomotive boiler

all of the above

Babcock and Wilcox boiler

17 / 50

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

lancashire boiler

babcock and wilcox boiler

cochran boiler

pulverised fuel fired boiler

18 / 50

Clearance volume in actual reciprocating compressors is essential __________________?

to attain high volumetric efficiency

to accommedate Valves in the cylinder head

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

to provide cushioning effect

19 / 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

equal

less

20 / 50

For economical operation of a nuclear plant__________________?

used fuel should be reprocessed

control rods should be used

moderator should be used

coolant should be employed

21 / 50

The critical activity has____________________?

maximum float

minimum float

zero float,

average float

22 / 50

Method of governing used in petrol engine is________________?

combined governing

partial governing

quality governing

quantity governing

23 / 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

one dimensional flow

turbulent flow

steady flow

24 / 50

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

235?

180?

125?

200?

25 / 50

An event is indicated on the network by_________________?

a number enclosed in a circle or a square

a straight line with circles at the ends

a dotted line

a straight line

26 / 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___________________?

ultimate stress

yeiled stress

longitudinal stress

hoop stress

27 / 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

decreases

increases

increases/decreases depending on steam temperature requirements

28 / 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 is increased

pressure becomes more than critical pressure

29 / 50

In fast breeder reactors___________________?

moderator is dispensed with

any type of moderator can be used

graphite is used as the moderator

heavy water is used as the moderator

30 / 50

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

may increase/decrease depending on compressor clearance

decrease

increase

remain unaffected

31 / 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

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___________________?

1:01

1:03

9:01

1:09

33 / 50

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

All

heating of building in winter

none of the above

air preheaters

34 / 50

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

421 kgm

102 kgm

539 kgm

421 kgm

35 / 50

Pick up the false statement ?

S.I. engines are quality-governed engines

Thermal efficiency of diesel engine i about 34%

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

High speed compression engines operate on dual combustion cycle

36 / 50

According to Clausis statement of second law of thermodynamics___________________?

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 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

37 / 50

Highest pressure encountered in a refrigeration system should be________________?

critical pressure of refrigerant

near critical pressure

much above critical pressure

much below critical pressure

38 / 50

Two systems shall be dynamically equivalent when____________________?

e.g. of two coincides

the mass of two are same

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

all of the above

39 / 50

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

dose chemicals in feed water

pump feed water

create vacuum at turbine exhaust

create vacuum in furnace

40 / 50

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

steep

horizontal

first rise and then fall

nearly horizontal

41 / 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

42 / 50

Machine screws are________________?

similar to stud

used to prevent relative motion be-tween two parts

slotted for a screw driver and generally used with a nut

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

43 / 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

44 / 50

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

reducing stress concentration

safety

fullering and caulking

ease of manufacture

45 / 50

Machining properties of steel are improved by adding___________________?

silicon, aluminium, titanium

chromium, nickel

sulphur, lead, phosphorous

vanadium, aluminium

46 / 50

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

2:01

1:01

4:01

1:06

47 / 50

Klein?s construction can be used when_________________?

crank has uniform angular velocity and angular acceleration

crank has a uniform angular velocity

crank has uniform angular acceleration

crank has non-uniform velocity

48 / 50

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

25 kN/m2

245 kN/m2

2500 kN/m2

2.5kN/m2

49 / 50

Scavenging is usually done to increase__________________?

power output

speed

thermal efficiency

fuel consumption

50 / 50

Which of the following organisation is preferred in automobile industry________________?

staff organisation

line organisation

functional organisation

line and staff organisations

Provide Your Information

NameEmailPhone Number

Your score is

The average score is 59%