REFRIGERATION AND AIR CONDITIONING

REFRIGERATION AND AIR CONDITIONING 

1. The compressor motor in

a hermetically sealed compressor

 is cooled by ............

a) Water

b) Air

c) Refrigerant

d) Nitrogen

Answer:- b) Air

2. The screw compressors can be

used for wet compression with

refrigerant -
a)  R134a

b)  R12

c)  NH3

d)  Water

Answer:- c)  NH3

3. For large capacity and high

volume flow rate the suitable

compressor is ............
a)  Centrifugal

b)  Reciprocating      

c)  Screw

d)   Scroll

Answer:- a)  Centrifugal

4. The main components of a

centrifugal compressor are .....

a)  Eye

b)  Impeller

c)  Diffuser

d)  Both (a) & (b)

Answer:- d)  Both (a) & (b)

5. The slip in case of three

phase induction motor is in

the range of.........

a) 0.5% to 5%

b) 2% to 10%

c) 10% to 15%

d) 15% to 20%

Answer:- a) 0.5% to 5%

6. High starling torque induction

motors for compressors are

used with .............

a)  Capillary tube      

b)  Condenser

c)  Float valves

d)  None of these

Answer:- d) None of these

7. The relationship between

rotor speed 'N' frequency 'F'and no.

of poles 'P' is given by
the relation ...........

a)  N=120t7P

b)  PN=120/f

c)  f=120N/P

d)  N=l20P/f

Answer:- a)  N=120t7P

8. The function of condenser

 in a refrigeration system is ..........

a) To cool surrounding air

b) To cool products or space

c) To condense the superheated

vapor refrigerant discharged by

the compressor

d) To condense the refrigerant

vapour entering the compressor

Answer:- c) To condense the superheated

vapor refrigerant discharged by

the compressor

9. Domestic refrigeration work on .....

a) Vapour compression cycle

b) Vapour absorption

c) Otto cycle

d) None of these

Answer:- a) Vapour compression cycle

10. Liquid receiver is installed in -

a) Suction line

b) Discharge line

c) Liquid line

d) Expansion line

Answer:- c) Liquid line

FITTER MULTIPLE CHOICE QUESTIONS (MCQ)

FITTER MULTIPLE CHOICE QUESTIONS     (MCQ)

The main purpose of annealing is …….
A  to increase the hardness
B  to increase the toughness
C  to improve the machinability
D  to remove the distortion

Answer: C  to improve the machinability

The important dimensions of a taper are.......

A. the large diameter and the length of the taper
B. the large diameter, the smaller diameter and
    the length of the taper

C. one diameter and the length of the taper
D. large diameter and the smaller diameter of
    the taper

Answer: B. the large diameter, the smaller diameter and
    the length of the taper

File grades are determined by the
A  distance from the tip of the heel
B  spacing of the teeth
C  cut of the file
D shape of the file

Answer: B  spacing of the teeth

The first aid boxes should be properly
equipped and kept in..............

A  important places

B  machining area

C  easy access place

D  right position

Answer: C  easy access place

Irregular shaped work piece are clamped on

the lathe in.........

A face plate
B  four jaw chuck
C  collet chuck
D mandrel

Answer: A face plate

Which type of thread is used in precision

instrument?
A  BSW thread
B  Acme thread
C  Square thread
D  BA thread

Answer: D  BA thread

Three jaw chuck is also known as
A  self centering chuck
B  self chuck
C  automatic chuck
D  union chuck

Answer: A  self centering chuck

What is used to measure the gap?
A  Tapper plug gauge
B  Slip gauge
C  Taper ring gauge
D  Thread gauge

Answer: B  Slip gauge

The form of threads are used in the places
where the sliding forces act in one direction,

is........

A vee thread

B square thread

C trapezoidal thread

D saw tooth thread

Answer: D saw tooth thread

The hardest cutting tool material
A  high speed steel
B  cemented carbide
C diamond
D stellite

Answer: C diamond

MECHANIC DIESEL MULTIPLE CHOICE QUESTIONS (MCQ)

MECHANIC DIESEL MULTIPLE CHOICE                              QUESTIONS (MCQ)

Which of the following engine

power is more power?

a) Internal Combustion Engine

b) External Combustion Engine

c) Both (a) &(b)

d) None of these

Answer:- a) Internal Combustion Engine

Engine valves are mounted ......

a) On Cylinder Block or Cylinder Head

b) Inside the cylinder
c) On crank case

d) None of these

Answer:- a) On Cylinder Block or Cylinder Head

Which of the following is used for

housing of crank shaft and cam shaft?
a)  Crank case

b)  Cylinder lining

c)  Piston ring

d)  Piston pin

Answer:- a)Crank case

Radiator of the which of engine is

small in size -

a) Petrol Engine

b) Diesel Engine

c) Both (a) &(b)

d) None of these

Answer:- a) Petrol Engine

Which of the engine has lesser

compression ratio?

a) Petrol Engine

b) Diesel Engine

c) Both (a) &(b)

d) None of these

Answer:- a) Petrol Engine

Which of the following is the part

of fuel feed system?
a) Fuel tank

b) Fuel filter

c) Fuel gauge

d) All of these

Answer:- d) All of these

Engine valves are opened by ...........

a) Cam shaft

b) Crank shaft

c) Rocker Arm

d) Valve Guide

Answer:- a) Cam shaft

In a petrol engine, if diesel is used,

 then the engine will ...........

a) Not run

b) Run more efficiently

c) Run at high speed

d) Explode

Answer:- a) Not run

What will happen due to abnormal

wear of oil ring of a piston?

a) High oil viscosity

b) More oil consumption

c) High oil pressure

d) Low pump pressure

Answer:- b) More oil consumption

The purpose of providing drain

plug in Air compressor is ............

a) To drain out oil

b) To drain out condensed water

c) To drain out air

d) To drain out coolant

Answer:- b) To drain out condensed water

EMPLOYABILITY SKILLS

EMPLOYABILITY SKILLS TWO YEAR TRADES (MORNING SESSION) 

SEMESTER-II JULY 2016

A commercial document issued by

 a seller to the buyer is called ..............
a)    Liability

b)    Asset

c)    Invoice

d)    Equity

Answer:- c)    Invoice

rrbtechquestions.blogspot.com

SWOT is primarily, a.-------                                                                                                                              a)      Planning tool      

b)      Marketing tool         

c)      Banking tool                

d)       Insurance tool                                                                                                                                                                  Answer:- a)      Planning tool

For availing loan facility, the entrepreneur 

has to contribute some money from own resources.

This amount of money is called-----.....

a)       Minimum money

b)       Maximum money

c)       Margin money

d)       Material money

Answer:- c)       Margin money

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SIDO is an apex organization

concerned with.....-------

a)       Welfare of women

b)       Child labour

c)       Population control

d)       Small scale industries.

Answer:- d)       Small scale industries

It is a document used as delivery note while sending goods.

The receiver signs on the duplicate copy and returns to

the sender as a token of acceptance. This document is

Called............

a) Challan

b) Invoice

c) Bill

d) Receipt

Answer:- a) Challan

rrbtechquestions.blogspot.com

What does MSME stand for?

a)       Mini, Small and Major Enterprises

b)       Micro, Small and Major Enterprises

c)       Micro. Small and Medium Enterprises

d)       Micro, Small and Main Enterprises

Answer:- c)  Micro. Small and Medium Enterprises

One of the ancillary services provided

by banks is "ATM Cards". What does "A TM
stand for?

a)       Any Time Money

b)       Anywhere Time Machine

c)       Ancillary Teller Machine

d)       Automatic Teller Machine

Answer:- d)       Automatic Teller Machine

rrbtechquestions.blogspot.com

A firm is said to be productively efficient, if

a)    Its Cost of production is low

b)    It is selling its product at low price

c)    It is producing what customers want

d)    It is most popular in the region                                                                                                     

Answer:- a)    Its Cost of production is low

Which one of the following is not

an advantage of introduction of

new technology in a firm?

a)    Reduction of waste

b)    Increases strain in industrial relation

c)    New and better products

d)    Better communication

Answer:- b) Increases strain in industrial relation

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LIC is concerned with—

a)       Real estate

c)       Export business

b)       Money lending
d)       Insurance

Answer:- d)  Insurance

MECHANIC DIESEL MULTIPLE CHOICE QUESTIONS (MCQ)

    MECHANIC DIESEL MULTIPLE CHOICE                              QUESTIONS (MCQ)
The Petrol Engine works on

the principle of ..........

a) Otto Cycle

b) Diesel Cycle

c) Pascal Cycle

d) None of these

Answer:- a) Otto Cycle

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Turbo charger in a Diesel

Engine is normally driven by ........
a)Inlet Air

b) Exhaust Gases

(c) Lub oil pump

 d) None of these

Answer:- b) Exhaust Gases

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Oil should be checked -

a) Before starting the engine

b) During running of engine

c) Within two minute after

     stopping the engine

d) None of the above

Answer:- a) Before starting the engine

A spark plug gap is kept between -

a)  0.2 to 0.8mm

b)  0.3 to 0.7mm

c)  0.4 to 0.9 mm

d)  0.6 to 1.0 mm

Answer:- a)  0.2 to 0.8mm

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Tappet clearance adjustment is

       carried out when ............

a) Both the inlet and exhaust valves are

     in shut position

b) Only inlet valve is in shut position

c) Only exhaust valve is in shut position

d) All of above

Answer:- a) Both the inlet and exhaust

valves are in shut position

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The lower portion of piston is called as -

a) Sleeve

b) Skirt

c) Piston Land

d) Grooves

Answer:- b) Skirt

The petrol air mixture at starting of

an engine needs to be ............
a)  Lean

b)  Pure petrol

(c) Same as for normal running

d)  Rich

Answer:- d) Rich

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Which of the following has

      finished surface?

a)Wet Liner

b) Dry Liner

c) Both (a) &(b)

d) None of these

Answer:- b) Dry Liner

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Piston diameter is...........than

cylinder diameter.

a) More

b) Less

c) Equal

d) None of these

Answer:- b) Less

Flywheel of a Diesel Engine

is made of ........

a) Wood

b) Aluminum

c) Brass

d) Steel

Answer:- d) Steel

rrbtechquestions.blogspot.com

FITTER MULTIPLE CHOICE QUESTIONS (MCQ)

FITTER MULTIPLE CHOICE QUESTIONS                                        (MCQ) 

Which of the following is the non-metallic anti

corrosion treatment?
A Enamelling
B Cladding
C Sheradising
D Caforising

Answer: A Enamelling

rrbtechquestions.blogspot.com

Which of the following fire extinguishing
agent is suitable for a live electrical fire?

A Water

B  Carbon dioxide

C  Carbon tetrachloride

D Foam

Answer: B  Carbon dioxide

rrbtechquestions.blogspot.com

In braze welding, the filler rod melting point

is...........

A  above 450°C
B  above 550°C
C  above 600°C
D  above 650°C

Answer: D  above 650°C

Which metal can be joined by soldering and

brazing easily than aluminium?
A Silver
B Copper
C Chromium
D Zinc

Answer: B Copper

rrbtechquestions.blogspot.com

Which pipe wrench is used for holding large

diameter of a pipe?
A   Chain wrench
B   Allen wrench
C  Strap wrench
D  Pipe wrench

Answer: A   Chain wrench

The belt slips, due to …….
A. less tension
B. misalignment
C. pulsating load
D. high starting torque

Answer: C. pulsating load

rrbtechquestions.blogspot.com

Taper keys are rectangular cross section.

They have a taper of..........

A  1 :100 on the thickness
B  1 :90 on the thickness
C  1 : 80 on the thickness
D  1 :70 on the thickness

Answer: A  1 :100 on the thickness

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The standard size of V belt from section 'D'

nominal top width is.........

A  22 mm
B  32 mm
C  38 mm
D  17 mm

Answer: B 32 mm

The error in squareness can be accurately
determined by using a...................

A  try square and slip gauge

B  try square and feeler gauge

C  cylinder square and slip gauge

D   beveled edge try square

Answer: C  cylinder square and slip gauge

rrbtechquestions.blogspot.com

The spirit level is used for checking the level

of machine when..........

A  lifting the machine
B  erecting the machine
C  shifting the machine
D  grouting the machine

Answer: B  erecting the machine

rrbtechquestions.blogspot.com

What is the function of a soldering iron in the

soldering process?
A  Melt the metal
B  Melt the solder
C  Cool the solder
D  Cool the metal

Answer: B  Melt the solder