Mechanical Engineering Quiz 24

1 / 50

Scavenging is usually done to increase__________________?

fuel consumption

power output

speed

thermal efficiency

2 / 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

steep

nearly horizontal

3 / 50

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

stoke

faraday

poise

pascal

4 / 50

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

work to compress air isothermally to work for actual compression

power to drive compressor to isothermal h.p.

isothermal h.p. to adiabatic h.p.

isothermal h.p. to the BHP of motor

5 / 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?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.

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

6 / 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

0.8 times

0.4 times

7 / 50

For economical operation of a nuclear plant__________________?

moderator should be used

used fuel should be reprocessed

control rods should be used

coolant should be employed

8 / 50

In fast breeder reactors___________________?

moderator is dispensed with

graphite is used as the moderator

any type of moderator can be used

heavy water is used as the moderator

9 / 50

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

125?

200?

180?

235?

10 / 50

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

decrease

increase

remain unaffected

may increase/decrease depending on compressor clearance

11 / 50

The critical activity has____________________?

minimum float

maximum float

zero float,

average float

12 / 50

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

fullering and caulking

ease of manufacture

safety

reducing stress concentration

13 / 50

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

equal

less

may be less or more depending on temperature

14 / 50

Klein?s construction can be used when_________________?

crank has a uniform angular velocity

crank has uniform angular acceleration

crank has non-uniform velocity

crank has uniform angular velocity and angular acceleration

15 / 50

Clearance volume in actual reciprocating compressors is essential __________________?

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

to attain high volumetric efficiency

16 / 50

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

none of the above

at 45? to PO

perpendicular to PO

along PO

17 / 50

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

internal resistanpe

tensile stress

compressive stress

transverse stress

18 / 50

Cupola produces following material__________________?

cast iron

wrought iron

malleable iron

pig iron

19 / 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

e.g. of two coincides

all of the above

20 / 50

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

1:09

1:03

1:01

9:01

21 / 50

Method of governing used in petrol engine is________________?

combined governing

partial governing

quantity governing

quality governing

22 / 50

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

pump feed water

create vacuum in furnace

create vacuum at turbine exhaust

dose chemicals in feed water

23 / 50

Which type of boiler can meet rapid changes of load____________________?

horizontal water tube type

forced circulation type

vertical fire tube type

horizontal fire tube type

24 / 50

The percentage of carbon in low carbon steel is__________________?

0.05%

0.15%

0.30%

0.50%

25 / 50

Highest pressure encountered in a refrigeration system should be________________?

near critical pressure

much above critical pressure

critical pressure of refrigerant

much below critical pressure

26 / 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

27 / 50

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

102 kgm

539 kgm

421 kgm

28 / 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

40 x 105 kg/cm2

400 kg/cm2

4000 kg/cm2

29 / 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

30 / 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

31 / 50

Pick up the correct statement from the following?

critical path method provides a realistic approach to the daily problems

all of the above

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

critical path method is an improvement upon bar chart method

32 / 50

Machine screws are________________?

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

similar to stud

used to prevent relative motion be-tween two parts

slotted for a screw driver and generally used with a nut

33 / 50

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

less

less or more depending on size of boiler

same

34 / 50

Pressurised water reactor is designed________________?

to prevent the water coolant from boiling in the core

for boiling pi water in the core

to use liquid sodium metal as coolant

to use intermediate coolant

35 / 50

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

40?

122?

136?

152?

36 / 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

37 / 50

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

1:01

4:01

2:01

1:06

38 / 50

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

cochran boiler

pulverised fuel fired boiler

lancashire boiler

babcock and wilcox boiler

39 / 50

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

kcal/hr m2 ?C

kcal/kg m2 ?C

kcal-m/hr m2 ?C

kcal-m/hr ?C

40 / 50

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

kinematically sound

not sound

data is not sufficient to determine same

soundness would depend upon which link is kept fixed

41 / 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

uniform flow

turbulent flow

one dimensional flow

42 / 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

43 / 50

An event is indicated on the network by_________________?

a number enclosed in a circle or a square

a dotted line

a straight line

a straight line with circles at the ends

44 / 50

Which of the following organisation is preferred in automobile industry________________?

functional organisation

line organisation

staff organisation

line and staff organisations

45 / 50

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

cavitation of .boiler feed pumps

pH value of water

corrosion caused by oxygen

heat transfer coefficient

46 / 50

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

less

equal

depends on other factors

47 / 50

Euler?s dimensionless number relates the following__________________?

inertial force and gravity

viscous force and inertial force

viscous force and buoyancy force

pressure force and inertial force

48 / 50

Which of the following is a fire tube boiler________________?

locomotive boiler

Babcock and Wilcox boiler

all of the above

Stirling boiler.

49 / 50

Cavitation will begin when__________________?

pressure 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

flow is increased

50 / 50

Machining properties of steel are improved by adding___________________?

chromium, nickel

vanadium, aluminium

silicon, aluminium, titanium

sulphur, lead, phosphorous

Provide Your Information

NameEmailPhone Number

Your score is

The average score is 59%