Mechanical Engineering Quiz 24

1 / 50

Which type of boiler can meet rapid changes of load____________________?

horizontal water tube type

vertical fire tube type

horizontal fire tube type

forced circulation type

2 / 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

steep

horizontal

3 / 50

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

200?

125?

235?

180?

4 / 50

Pick up the correct statement from the following?

all of the above

critical path method provides a realistic approach to the daily problems

critical path method is an improvement upon bar chart method

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

5 / 50

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

cochran boiler

lancashire boiler

pulverised fuel fired boiler

babcock and wilcox boiler

6 / 50

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

102 kgm

421 kgm

539 kgm

7 / 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

8 / 50

Pressurised water reactor is designed________________?

to use liquid sodium metal as coolant

for boiling pi water in the core

to use intermediate coolant

to prevent the water coolant from boiling in the core

9 / 50

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

kinematically sound

not sound

soundness would depend upon which link is kept fixed

data is not sufficient to determine same

10 / 50

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

25 kN/m2

2500 kN/m2

2.5kN/m2

245 kN/m2

11 / 50

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

same

less or more depending on size of boiler

less

12 / 50

Highest pressure encountered in a refrigeration system should be________________?

much above critical pressure

much below critical pressure

near critical pressure

critical pressure of refrigerant

13 / 50

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

kcal/hr m2 ?C

kcal/kg m2 ?C

kcal-m/hr ?C

kcal-m/hr m2 ?C

14 / 50

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

reducing stress concentration

ease of manufacture

fullering and caulking

safety

15 / 50

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

pump feed water

create vacuum in furnace

dose chemicals in feed water

create vacuum at turbine exhaust

16 / 50

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

pascal

stoke

poise

faraday

17 / 50

Which of the following organisation is preferred in automobile industry________________?

line and staff organisations

functional organisation

staff organisation

line organisation

18 / 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

19 / 50

Machine screws are________________?

similar to stud

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

used to prevent relative motion be-tween two parts

slotted for a screw driver and generally used with a nut

20 / 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___________________?

longitudinal stress

ultimate stress

hoop stress

yeiled stress

21 / 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

power to drive compressor to isothermal h.p.

work to compress air isothermally to work for actual compression

22 / 50

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

transverse stress

compressive stress

tensile stress

internal resistanpe

23 / 50

Cupola produces following material__________________?

malleable iron

pig iron

wrought iron

cast iron

24 / 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 105 kg/cm2

400 kg/cm2

40 x 106 kg/cm2

4000 kg/cm2

25 / 50

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

decreases

increases/decreases depending on steam temperature requirements

increases

remains unchanged

26 / 50

Klein?s construction can be used when_________________?

crank has uniform angular velocity and angular acceleration

crank has a uniform angular velocity

crank has non-uniform velocity

crank has uniform angular acceleration

27 / 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

28 / 50

An event is indicated on the network by_________________?

a straight line

a dotted line

a straight line with circles at the ends

a number enclosed in a circle or a square

29 / 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

0.7 times

0.6 times

0.4 times

30 / 50

Which of the following is a fire tube boiler________________?

locomotive boiler

all of the above

Babcock and Wilcox boiler

Stirling boiler.

31 / 50

In fast breeder reactors___________________?

heavy water is used as the moderator

graphite is used as the moderator

any type of moderator can be used

moderator is dispensed with

32 / 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

steady flow

one dimensional flow

33 / 50

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

4:01

2:01

1:01

1:06

34 / 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

1:01

1:09

9:01

35 / 50

The critical activity has____________________?

average float

maximum float

zero float,

minimum float

36 / 50

Machining properties of steel are improved by adding___________________?

vanadium, aluminium

silicon, aluminium, titanium

sulphur, lead, phosphorous

chromium, nickel

37 / 50

Cavitation will begin when__________________?

flow is increased

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

38 / 50

Euler?s dimensionless number relates the following__________________?

viscous force and inertial force

pressure force and inertial force

viscous force and buoyancy force

inertial force and gravity

39 / 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

40 / 50

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

may increase/decrease depending on compressor clearance

remain unaffected

decrease

increase

41 / 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

42 / 50

Scavenging is usually done to increase__________________?

power output

speed

fuel consumption

thermal efficiency

43 / 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

44 / 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

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

45 / 50

For economical operation of a nuclear plant__________________?

moderator should be used

coolant should be employed

control rods should be used

used fuel should be reprocessed

46 / 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 source to high temperature source

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 to high temperature source without the aid of external energy

47 / 50

Method of governing used in petrol engine is________________?

quality governing

quantity governing

partial governing

combined governing

48 / 50

The percentage of carbon in low carbon steel is__________________?

0.05%

0.30%

0.15%

0.50%

49 / 50

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

along PO

perpendicular to PO

none of the above

at 45? to PO

50 / 50

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

122?

40?

152?

136?

Provide Your Information

NameEmailPhone Number

Your score is

The average score is 59%