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Johnson Controls India Assessment Test 03

Total questions: 50

Worksheet time: 50mins

Name
Class
Date
1.

The simple interest on ₹5000 at 12% per annum for 3 years is:

a)

₹1500

b)

₹1600

c)

₹1700

d)

₹1800

2.

If 18 men can build a wall in 15 days, how many men are required to build it in 9 days?

a)

24

b)

28

c)

30

d)

32

3.

The average of first 10 natural numbers is:

a)

5

b)

5.5

c)

6

d)

6.5

4.

A sum of money doubles in 6 years at simple interest. The rate of interest is:

a)

12%

b)

14%

c)

16.5%

d)

18%

5.

The probability of drawing a red ball from a bag containing 3 red, 5 blue, 2 green balls is:

a)

1/3

b)

3/10

c)

2/5

d)

3/5

6.

A train 120 m long passes a pole in 12 seconds. Its speed is:

a)

30 kmph

b)

36 kmph

c)

40 kmph

d)

45 kmph

7.

The value of (x – 1)(x – 2)(x – 3)(x – 4) + 24, when x = 5, is:

a)

0

b)

10

c)

20

d)

24

8.

A person invested ₹4000 at 5% simple interest and ₹6000 at 10%. His average rate of interest is:

a)

7%

b)

7.5%

c)

8%

d)

8.5%

9.

The next term in the series 2, 5, 10, 17, 26, ?

a)

35

b)

36

c)

37

d)

38

10.

If 2 pipes can fill a tank in 20 min and 30 min respectively, together they fill in:

a)

10 min

b)

12 min

c)

15 min

d)

25 min

11.

The unit of electrical energy is:

a)

Watt

b)

Joule

c)

Watt-hour

d)

Ohm

12.

Which law states that current is directly proportional to voltage at constant temperature?

a)

Ohm’s law

b)

Faraday’s law

c)

Lenz’s law

d)

Ampere’s law

13.

In a DC machine, commutator is used for:

a)

Reducing eddy current

b)

Converting AC to DC

c)

Converting DC to AC

d)

Insulating armature

14.

Which protection device trips during overload in motors?

a)

MCB

b)

MCCB

c)

Overload relay

d)

RCCB

15.

In AC circuits, the power factor is defined as:

a)

VI

b)

cos φ

c)

sin φ

d)

tan φ

16.

A step-up transformer increases:

a)

Current

b)

Voltage

c)

Power

d)

Frequency

17.

Which of the following is NOT a semiconductor?

a)

Silicon

b)

Germanium

c)

Copper

d)

Gallium arsenide

18.

The slip of a synchronous motor is:

a)

0

b)

1

c)

1

19.

Which of the following is a passive component?

a)

Transistor

b)

Diode

c)

Resistor

d)

SCR

20.

The advantage of LED over incandescent lamp is:

a)

Less life

b)

More heat

c)

Less efficiency

d)

Less power consumption

21.

The working principle of RTD is:

a)

Resistance changes with temperature

b)

Capacitance changes with temperature

c)

Inductance changes with pressure

d)

Voltage changes with force

22.

Which device is used for flow measurement in open channels?

a)

Venturimeter

b)

Orifice meter

c)

Weir

d)

Pitot tube

23.

Dead zone of an instrument is:

a)

Largest value of input before change in output

b)

Smallest value of input before change in output

c)

Repeatability

d)

Hysteresis

24.

Which of the following is an active transducer?

a)

Thermocouple

b)

Strain gauge

c)

LVDT

d)

Potentiometer

25.

Bourdon tube is used to measure:

a)

Flow

b)

Pressure

c)

Temperature

d)

Humidity

26.

Which sensor is used in CNC machines for feedback?

a)

Tachometer

b)

Encoder

c)

LVDT

d)

Strain gauge

27.

The range of 4–20 mA signal represents:

a)

Digital transmission

b)

Analog transmission

c)

Wireless transmission

d)

Pulse transmission

28.

The main purpose of a filter in instrumentation system is:

a)

Noise reduction

b)

Gain control

c)

Encoding

d)

Decoding

29.

Which instrument measures gas concentration?

a)

Orsat apparatus

b)

Tachometer

c)

Hygrometer

d)

Load cell

30.

Signal-to-noise ratio (SNR) is ratio of:

a)

Desired signal / Noise

b)

Noise / Signal

c)

Signal / Error

d)

Error / Signal

31.

The unit of heat transfer rate is:

a)

W

b)

J

c)

W/m²

d)

J/kgK

32.

The COP of a Carnot refrigerator operating between –5°C and 25°C is:

a)

4.5

b)

5.5

c)

6.5

d)

7.5

33.

The refrigerant R-134a is:

a)

CFC

b)

HCFC

c)

HFC

d)

Ammonia

34.

Which type of heat exchanger is commonly used in chillers?

a)

Plate heat exchanger

b)

Double pipe heat exchanger

c)

Shell-and-tube heat exchanger

d)

Finned tube heat exchanger

35.

In HVAC, VAV stands for:

a)

Variable Air Volume

b)

Very Active Ventilation

c)

Variable Area Venturi

d)

Ventilation and Air Velocity

36.

The capacity of a 100 TR chiller is approximately:

a)

100 kW

b)

200 kW

c)

350 kW

d)

1200 kW

37.

The most widely used compressor in domestic refrigerators:

a)

Centrifugal

b)

Screw

c)

Scroll

d)

Reciprocating

38.

The governing equation for convection heat transfer is:

a)

Fourier’s law

b)

Newton’s law of cooling

c)

Stefan–Boltzmann law

d)

Pascal’s law

39.

Which refrigerant is phased out due to ozone depletion?

a)

R-22

b)

R-134a

c)

R-717

d)

R-1234yf

40.

The main function of cooling tower in HVAC system is:

a)

Absorb heat from chilled water

b)

Reject heat from condenser water

c)

Compress refrigerant

d)

Control humidity

41.

A heat exchanger with counterflow arrangement has:

a)

Lowest effectiveness

b)

Highest effectiveness

c)

Same as parallel flow

d)

No difference

42.

The enthalpy of vaporization decreases with:

a)

Increase in temperature

b)

Decrease in temperature

c)

Pressure remaining constant

d)

None

43.

The ideal gas law is:

a)

PV = RT

b)

PV = nRT

c)

PV/T = R

d)

P/T = nR

44.

In psychrometry, DBT stands for:

a)

Dry Bulb Temperature

b)

Differential Barometric Temperature

c)

Dynamic Barometric Trend

d)

Dry Base Test

45.

The type of compressor most efficient at very large capacities:

a)

Scroll

b)

Screw

c)

Centrifugal

d)

Reciprocating

46.

In ASHRAE standards, indoor comfort is generally defined between relative humidity range of:

a)

10–20%

b)

20–40%

c)

30–60%

d)

50–80%

47.

Which cycle is used in absorption chillers?

a)

Brayton cycle

b)

Rankine cycle

c)

Lithium Bromide–Water cycle

d)

Carnot cycle

48.

Heat exchanger LMTD method is used to calculate:

a)

Pressure drop

b)

Mean temperature difference

c)

Refrigerant charge

d)

Volume flow rate

49.

The term SEER in HVAC stands for:

a)

Seasonal Energy Efficiency Ratio

b)

Standard Energy Equipment Rating

c)

Seasonal Exhaust Energy Ratio

d)

Standard Efficiency Evaluation Ratio

50.

In centrifugal chillers, “surge” refers to:

a)

Stable operation

b)

Unstable reverse flow of refrigerant

c)

Extra cooling capacity

d)

High COP condition

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