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Johnson Controls India Assessment Test 01

Total questions: 50

Worksheet time: 50mins

Name
Class
Date
1.

The average of 8 numbers is 25. If one number is removed, the average becomes 24. The number removed is:

a)

24

b)

25

c)

32

d)

33

2.

A man saves ₹2400, which is 20% of his monthly income. His monthly income is:

a)

₹10,000

b)

₹11,500

c)

₹12,000

d)

₹12,500

3.

A train running at 72 kmph crosses a platform in 30 seconds. If train length is 180 m, the platform length is:

a)

420 m

b)

400 m

c)

360 m

d)

300 m

4.

If 15 men can do a work in 12 days, how many men are needed to finish it in 9 days?

a)

18

b)

20

c)

22

d)

25

5.

The compound interest on ₹10,000 at 10% for 2 years is:

a)

₹2000

b)

₹2100

c)

₹2200

d)

₹2300

6.

The next term in the series: 3, 9, 27, 81, ?

a)

121

b)

243

c)

162

d)

324

7.

A can finish a work in 15 days, B in 20 days. If they work together, the work will finish in:

a)

7.5 days

b)

8.5 days

c)

9 days

d)

10 days

8.

If 40% of x = 50% of y, then x : y is:

a)

4:5

b)

5:4

c)

2:3

d)

3:2

9.

The perimeter of a rectangle is 160 m and length is 50 m. Its area is:

a)

2800 m²

b)

3000 m²

c)

3200 m²

d)

3600 m²

10.

A card is drawn from a deck. Probability of getting a king is:

a)

1/26

b)

1/13

c)

1/12

d)

1/52

11.

The frequency of Indian power supply is:

a)

50 Hz

b)

60 Hz

c)

100 Hz

d)

120 Hz

12.

Which motor is used in ceiling fans?

a)

Induction motor

b)

Synchronous motor

c)

Universal motor

d)

DC shunt motor

13.

In electrical machines, the lamination is used to reduce:

a)

Eddy current loss

b)

Hysteresis loss

c)

Copper loss

d)

I²R loss

14.

Which material is used for making permanent magnets?

a)

Soft iron

b)

Silicon steel

c)

Hard steel

d)

Copper

15.

A diode conducts when it is:

a)

Reverse biased

b)

Forward biased

c)

Both

d)

None

16.

Which law is also called “law of conservation of charge”?

a)

Joule’s Law

b)

Kirchhoff’s Current Law

c)

Kirchhoff’s Voltage Law

d)

Faraday’s Law

17.

The unit of inductance is:

a)

Henry

b)

Tesla

c)

Weber

d)

Ampere

18.

The efficiency of a transformer is maximum when:

a)

Iron loss = Copper loss

b)

Iron loss > Copper loss

c)

Iron loss < Copper loss

d)

At no load

19.

A CRO is used to measure:

a)

Frequency

b)

Voltage waveform

c)

Time period

d)

All of these

20.

Which device converts light into electricity?

a)

Photodiode

b)

Photovoltaic cell

c)

LED

d)

LDR

21.

Thermocouples work on principle of:

a)

Seebeck effect

b)

Hall effect

c)

Piezoelectric effect

d)

Doppler effect

22.

A manometer measures:

a)

Pressure

b)

Temperature

c)

Velocity

d)

Flow

23.

Which device converts displacement into electrical signal?

a)

LVDT

b)

Thermistor

c)

Potentiometer

d)

Tachometer

24.

A tachometer is used to measure:

a)

Pressure

b)

Temperature

c)

Speed

d)

Flow

25.

Strain gauge changes which property when strained?

a)

Voltage

b)

Resistance

c)

Inductance

d)

Capacitance

26.

Piezoelectric materials are used to measure:

a)

Pressure

b)

Temperature

c)

Acceleration

d)

Force

27.

Accuracy of an instrument is defined as:

a)

Closeness to true value

b)

Repeatability

c)

Smallest division

d)

Sensitivity

28.

The main purpose of a signal conditioner is to:

a)

Filter and amplify signals

b)

Display signals

c)

Store signals

d)

Encode signals

29.

A load cell is used for measurement of:

a)

Pressure

b)

Force/Weight

c)

Flow

d)

Displacement

30.

Which instrument measures relative humidity?

a)

Psychrometer

b)

Hygrometer

c)

Barometer

d)

Anemometer

31.

The COP of a refrigerator is ratio of:

a)

Work done / Heat absorbed

b)

Heat absorbed / Work done

c)

Work done / Heat rejected

d)

Heat rejected / Work done

32.

Which refrigerant is known as eco-friendly refrigerant?

a)

R-22

b)

R-134a

c)

R-12

d)

R-717 (Ammonia)

33.

The function of an evaporator in a chiller is:

a)

Absorb heat from chilled water

b)

Reject heat to atmosphere

c)

Compress refrigerant

d)

Reduce noise

34.

Which chiller type is most energy efficient and used in large buildings?

a)

Screw chiller

b)

Reciprocating chiller

c)

Centrifugal chiller

d)

Absorption chiller

35.

In a shell-and-tube heat exchanger, baffles are used to:

a)

Reduce heat transfer

b)

Increase turbulence and heat transfer

c)

Maintain laminar flow

d)

Block tubes

36.

In HVAC, AHRI stands for:

a)

American Heating and Refrigeration Institute

b)

Air-Conditioning, Heating and Refrigeration Institute

c)

Association of Heating Refrigeration Industries

d)

None

37.

The device used to reduce compressor speed and save energy in chillers is:

a)

VFD (Variable Frequency Drive)

b)

Throttle valve

c)

Diffuser

d)

Economizer

38.

A psychrometric chart is used to determine:

a)

Power of motor

b)

Refrigerant charge

c)

Air properties (humidity, enthalpy, DBT, WBT)

d)

Efficiency of turbine

39.

The main purpose of a condenser in HVAC is to:

a)

Absorb heat from water

b)

Reject heat to surroundings

c)

Superheat refrigerant

d)

Store refrigerant

40.

The COP of a heat pump is always:

a)

Less than 1

b)

Equal to 1

c)

Greater than 1

d)

Cannot be determined

41.

The refrigerant property with environmental concern is:

a)

Thermal conductivity

b)

Specific heat

c)

GWP (Global Warming Potential)

d)

Viscosity

42.

In an HVAC system, the diffuser is used for:

a)

Air filtration

b)

Even distribution of air

c)

Cooling water

d)

Increasing refrigerant pressure

43.

In centrifugal chillers, the diffuser after impeller:

a)

Reduces velocity, increases pressure

b)

Increases velocity

c)

Reduces pressure

d)

Rejects heat

44.

A ton of refrigeration (TR) is equal to:

a)

210 kJ/min

b)

211 kJ/min

c)

3.517 kW

d)

All of these

45.

In absorption chillers, the main driving energy is:

a)

Electrical power

b)

Solar energy or waste heat

c)

Mechanical power

d)

Wind energy

46.

The commonly used compressor in large chillers:

a)

Scroll compressor

b)

Screw compressor

c)

Reciprocating compressor

d)

Centrifugal compressor

47.

Which industry standard specifies HVAC performance testing?

a)

ISO 14001

b)

ASHRAE 90.1

c)

ASTM E84

d)

IEEE 519

48.

In cooling towers, the effectiveness depends on:

a)

Wet bulb temperature

b)

Dry bulb temperature

c)

COP of chiller

d)

Refrigerant charge

49.

The unit of heat transfer coefficient is:

a)

W/m²K

b)

W/mK

c)

J/kgK

d)

W/m³K

50.

In HVAC load calculations, diversity factor is used to:

a)

Reduce calculated peak load

b)

Increase load

c)

Eliminate latent heat

d)

Increase safety margin

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