Ffc Sample Paper 43n5h

Surge occurs in compressor due to ..............

(a) Too high pressure ratio

(b) To low mass flow

(c) Both

2. Cavitation occurs in ...............

(a) Pumps

(b) Compressors

(c) Both

(d) None

3. ...... Seals are employed where no movement occurs at the junction to

be sealed.

(a) Static

(b) Dynamic

(c) Any of a & b

4. If we want to increase capacity, the pumps are connected in .................

(a) Series

(b) Parallel

(c) None of above

5. A turbine having a large amount of expansion occurring in the buckets or

blading of the wheel is .................

(a) Impulse

(b) Reaction

(c) Both

6. Function of nozzle in an impulse turbine is ..............

(a) To convert pressure into velocity

(b) To convert velocity into pressure

(c) To increase both velocity & pressure

7. In case of sleeve type journal bearing the bearing..........

(a) Touches the shaft

(b) Does not touch the shaft

8. The tendency of air or gas to move outward from the center of rotating

impellers is called ................... tendency.

(a) Centrifugal

(b) Rotary

(c) Centripetal

(d) Linear

9. When the gas is at the tips of centrifugal compressor impeller blades, it is

at ...... velocity.

(a) Minimum

(b) Maximum

(c) Medium

(d) Zero

10. The diff coverts the velocity of the gas to increase gas ..................

(a) Temperature

(b)Pressure

(c) Volume

(d)Energy

11. A centrifugal compressor by doing work on a gas imparts both .......... &

.......... to the gas.

(a) Pressure, volume

(b)Volume, temperature

(c) Pressure, velocity

(d)Velocity, temperature

12. At any given RPM, the work done by the compressor on each pound of

gas handled is ...................

(a) Nearly constant

(b)Variable

(c) Increasing

(d)Decreasing

13. In a centrifugal compressor, for a heavier gas the brake horsepower

required............

(a) Decrease

(b)Increase

(c) Remained constant

(d)None of above

14. Surging occurs when compressor is operated below

minimum.................

(a) Head

(b)Pressure

(c) Capacity

(d)BHP

15. Increasing the speed of a compressor will.......... the generated head

(a) increase

(b)decrease

(c) vary

16. Steam turbines are ..............speed driven

(a) Constant

(b)Variable

17. In compressors to convert velocity into pressure ........... is used.

(a) Guide vanes

(b)Nozzle

(c) Diffs

(d)Diaphragm

18. Restrictive ring shaft seals consist of rings of low friction material

like...........

(a) Cast iron

(b)Mild steel

(c) Rubber

(d)Carbon

19. The rotary speed at which the shaft vibrates at its natural frequency is

its.......speed

(a) Highest

(b)Lowest

(c) Critical

20. Misalignment usually appears at............in a spectrum

(a) 1 X

(b)2 X

(c) 5 X

(d)10X

21. NPSH available must be .......... than NPSH required

(a) More

(b) Less

22. Packing is chosen on the basis of liquid being pumped and its .............

(a) Pressure

(b) Temperature

(c) Density

23. Smallest size of a plain journal bearing may be ..............

(a) 1 inch

(b)1⁄2 inch

(c) 1⁄4 inch

24. Which of the following will offer better resistance to unexpected load and

shock conditions?

(a) Antifriction bearing

(b) Plain journal bearing

25. In a full journal bearing or bushing the strength comes from .........

(a) bearing housing wall thickness

(b) bushing wall thickness

26. In boundary lubrication (in case of journal bearing) what is happening?

(a) There is no metal to metal

(b) There is some metal to metal

27. Match the following: When a journal bearing needs replacement

(a) High speed machine 2 x original clearance

(b) Slow speed machine 3 x original clearance

28. Which one will require a thick lubrication film?

(a) Ball bearing running at high speed

(b) Ball bearing running at low speed

29. For high speed machine what kind of lubrication will be preferred?

(c) Lube oil

(d) Grease

(e) Doesn’t matter

30. Which one of the following will not require re-lubrication?

(a) Sealed bearing

(b) Shielded bearings

31. Starting friction is lower for ...............

(a) Plain bearing

(b) Ball bearing

(c) Roller bearing

(d) Both b & c

Starting friction is lower for ...............

(a) Plain bearing

(b) Ball bearing

(c) Roller bearing

(d) Both b & c

32. Which one will require a lubrication filter build up at start up?

(a) Antifriction bearing

(b) Plain bearing

33. Which is higher for any machine

(a) Starting torque

(b) Running torque

34. In a ball bearing axial load is usually born by .............

(a) Inner race

(b) Outer race

(c) Cage

(d) Raceway shoulders

35. Needle roller bearings are used in ................

(a) Low speed application

(b) High speed application

III)

This is Second Part of Notes

Find out First Part at

FFBL and FFCL Test Papers for Apprenticeship

36. In centrifugal pump ribs are provided on the back of impeller for.....

(a) Radial balancing

(b)Axial balancing

37. Write down at least one cause for the following problems in a steam

turbine?

(a) Excessive vibration

(b)Excessive coupling wear

(c) Turbine fails to start

(d)Turbine does not come up to speed

(e) Excessive steam consumption

(f) Erratic speed control

(g)Over speed trip not functioning properly.

(h)Turbine does not cool down after stoppage

(i)Water in lubricating oil

38. The speed-sensing drive which indicates turbine speed and makes

correction is called..............

(a) Tachometer

(b)Speed sensor

(c) Governor

39. Centrifugal compressors are ........... speed range machines.

(a) Wide

(b)Narrow

40. For very high pressure ...................is used

(a) Mechanical seals

(b)Labyrinth seals

(c) Liquid filter shaft seal

41. When a compressor is used for moderate to high-pressure service, to

minimize leakages a ................split casing is used.

(a) Horizontally

(b)Vertically

(c)

Diameter of inlet lines as compared to discharge line in compressors is ..........

(a) Smaller

(b) Larger

(c) Equal

42. In a pump, the close fit between the stationary wear ring and the rotating

wear ring ...........the amount of high pressure liquid going back into the

suction.

(a) Increase

(b) Decrease

43. An unbalance impeller may cause a ..............vibration.

(a) Axial

(b)Radial

44. In condensing turbine, the condenser is located at ....................

(a) suction side

(b) exhaust side

(c) at some intermediate stage

45. Ball bearings may be used for ...............turbine.

(a) Small

(b)Large

46. Match the following

(a) 6405 Self aligning ball bearing

(b) 2302 Deep groove ball bearing

(c) 7200 BEP Cylindrical roller bearing

(d) NU 1016 Angular ball bearing

47. The balancing drum is attached to the shaft at the ...........end of the

compressor.

(a) Suction

(b)Discharge

48. Diaphragm are present in ........................... centrifugal compressor.

(a) Single stage

(b) Multistage

(c) Both

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Q-1. WHICH FLUID IS INTRODUCED FIRST IN A HEAT

EXCHANGER?

A

B

HEATING

COOLING

Q-2. WHICH ONE IS BEST CONDUCTOR OF HEAT? A

B

C

METAL

LIQUID

GASES

Q-3. ROTOR SPEED OF A TURBINE CAN BE INCREASED BY

_____________.

A

B

C

INCREASING LOAD

DECREASING LOAD

NONE OF THE ABOVE

Q-4. HORSE POWER REQUIRED TO PUMP A MORE VISCOUS

LIQUID IS _________________.

A

B

C

SAME

GREATER

LOWER

Q-5. AMMONIA IS MADE BY THE REACTION OF

______________ WITH NITROGEN.

A

B

C

WATER

METHANE

HYDROGEN

Q-6. WATER WITH A PH VALUE OF 6.9 IS ____________ A

B

C

ACIDIC

ALKALINE

NEUTRAL

Q-7. THE SET {1, 2, 3, ....., 1000000} IS AN INFINITE SET. A

B

TRUE

FALSE

Q-8. A SET CONTAINING FINITE NUMBERS OF ELEMENTS IS

CALLED ____________________.

A

B

C

D

NULL SET

SUPER SET

FINITE SET

INFINITE SET

Q-9. ADDITIVE INVERS OF 0 IS _____________________. A

B

C

D

-1

DOES NOT EXIST

0

1

Q-10. (x – 6) (x – 4) = ________________. A

B

C

D

x

2 + 10 x + 24

x

2 – 10 x - 24

x

2 + 10 x – 24

x

2 – 10 x + 24

Q-11. THE TWO NUMBERS, WHO’S SUM IS –13 AND PRODUCT

– 30 ARE.

A

B

C

D

2, 15

2, -15

-3, 10

3, -10

Q-12. THE EQUATION ax2 + bx + C = 0 IS CALLED THE NONSTANDARD FORM OF A QUADRATIC EQUATION IN ONE

VARIABLE.

A

B

TRUE

FALSE

Q-13. A QUADRATIC EQUATION IN ONE VARIABLE HAS

___________________.

A

B

C

D

ONE ROOT

INFINITE NUMBERS OF ROOTS

NO ROOT

TWO ROOTS

Q-14. LOG 7x = 2, THEN x = ______________________. A

B

C

D

14

49

128

64

Q-15. IF TWO POINTS OF A LINE LIE ON A PLANE, THEN THE

WHOLE LINE LIES ON THAT PLANE.

A

B

TRUE

FALSE

Q-16. A TRIANGLE WHOSE THREE SIDES ARE CONGRUENT

IS CALLED _______________________.

A

B

C

D

EQUILATERAL TRIANGLE

RHOMBUS

RIGHT ANGLE TRIANGLE

ISOSCELES TRIANGE

Q-17. ONE AND ONLY ONE LINE CAN THROUGH A

B

C

D

ONE POINT

TWO POINTS

THREE POINTS

FOUR POINTS

Q-18. THE INTERSECTION OF A TANGENT AND A CIRCLE IS

CALLED ___________________.

A

B

C

D

ARC

POINT OF

CHORD

SECANT

Q-19. THE TWO ARCS OF TWO DIFFERENT CIRCLES ARE

CONGRUENT IF _______________________.

A

B

C

D

THE CIRCLES ARE CONGRUENT.

CORRESPONDING CENTRAL

ANGLES ARE CONGRUENT.

BOTH A AND B ARE SATISFIED.

NONE OF THESE.

Q-20. __________________ WEIGHT IS THE WEIGHT OF A

SUBSTANCE / MOLECULE IN GRAMS.

A

B

C

MOLECULAR

MOLAL

EQUIVALENT

Q-21. DENSITY OF A LIQUID ____________ WITH RISE IN

TEMPERATURE.

A

B

C

INCREASED

DECREASES

REMAINS AS SUCH

Q-22. pH IS DEFINED AS __________ OF HYDROGEN ION

CONCENTRATION (IN g/L)

A

B

C

LOG

NEGATIVE LOG

LOGe

Q-23. WHICH ONE OF THESE AGENTS DOES NOT TAKE PART

IN COMBUSTION

A

B

C

COMBUSTABLE GAS

STEAM

AIR

D SOURCE OF HEAT

Q-24. WHAT VOLUME IS REQUIRED TO MAKE 250 ml OF 10%

SOLUTION FROM 1 LITRE OF 20% SOLUTION.

A

B

C

D

100 ml

150 ml

125 ml

250 ml

Q-25. WHICH ONE IS CORRECT? A

B

C

D

N2 + H2 NH3

N2 + 3H2 2NH3

2N2 + 3H2 2NH3

NONE OF ABOVE

Q-26. FORMULA OF UREA IS A

B

C

D

NH4 – CO – NH4

NH3 – CO – NH3

NH2 – CO – NH2

NONE OF ABOVE

Q-27. FOR CO2 DETERMINATION IN ORSAT APPARATUS THE

ADSORPTION SOLUTION USED IS _________________.

A

B

C

NaOH

KOH

BOTH

Q-28. DISTILLATION IS THE PROCESS OF SEPARATION OF

DIFFERENT LIQUIDS IN A MIXTURE BY BOILING.

A

B

TRUE

FALSE

Q-29. RATE OF EVAPORATION IS DEPENDENT ON

______________________.

A

B

C

D

TEMPERATURE

SURFACE AREA

VELOCITY OF WIND

ALL ABOVE

Q-30. pH INDICATORS TAKE PART IN A CHEMICAL REACTION

DURING TITRATION.

A

B

YES

NO

Q-31. MOLARITY IS THE NUMBER OF MOLES OF

_______________ DISSOLVED IN 1 LITRE OF SOLUTION.

A

B

SOLUTE

SOLVENT

Q-32. EXOTHERMIC REACTION IS ONE IN WHICH HEAT IS A

B

C

EVOLVED

SUPPLIED

NEITHER OF ABOVE

Q-33. SALTS OF STRONG ACIDS WITH WEAK BASES

POSSESS ACIDIC REACTION IN AQUEOUS SOLUTION.

A

B

YES

NO

Q-34. IN COLOURIMETRIC ANALYSIS, COLOUR INTENSITY IS

DIRECTLY PROPORTIONAL TO THE CONCENTRATION

OF A PARTICULAR ELEMENT.

A

B

YES

NO

Q-35. PICK THE ODD ONE OUT. A

B

C

D

He

Ar

N2

CO2

Q-36. TEMPERATURE, AT WHICH VAPOUR OF A SOLUTION

EQUALS TO THE ATMOSPHERIC PRESSURE IS CALLED

THE __________________.

A

B

C

FREEZING POINT

BOILING POINT

FLASH POINT

Q-37. AVOGADRO’S NUMBER IS THE NUMBER OF ATOMS OF

MOLECULES IN_______________.

A

B

C

ONE GRAM OF A SUBSTANCE

1000 GRAMS OF A SUBSTANCE

ONE MOLE OF A SUBSTANCE

Q-38. WHICH ONE IS WEAK ACID. A

B

C

D

HCI

H2SO4

HNO3

HCN

Q-39. -40 oC IS EQUAL TO ________________. A

B

C

D

0 oF

-40 oF

-212 oF

-32 oF

Q-40. BUFFER SOLUTIONS HELP TO __________________. A

B

C

D

INCREASE RATE OF REACTION

DECREASE RATE OF REACTION

MAINTAIN THE SAME