## Interview MCQ Set 1

1. How many fluids remain at constant temperature during the process of boiling and condensation?

a) 1

b) 2

c) 3

d) 4

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2. Identify the correct expression for effectiveness

a) 4 – exponential (- NTU)

b) 3 – exponential (- NTU)

c) 2 – exponential (- NTU)

d) 1 – exponential (- NTU)

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_{MAX }= infinity and C

_{MIN}/C

_{MAX }= 0.

3. In a gas turbine recuperator, the capacity ratio becomes

a) 2

b) 1

c) 4

d) 3

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4. In a gas turbine recuperator, the expression for effectiveness for the parallel flow configuration reduces to

a) 1 – exponential (- NTU)/3

b) 1 – exponential (- NTU)/4

c) 1 – exponential (- 2 NTU)/2

d) 1 – exponential (- NTU)/6

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5. What is the maximum efficiency for parallel flow heat exchanger?

a) 5%

b) 10%

c) 20%

d) 50%

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6. A two pass surface condenser is required to handle the exhaust from a turbine developing 15 MW with specific steam consumption of 5 kg/k W h. The quality of exhaust steam is 0.9, the condenser vacuum is 66 cm of mercury while the bar meter reads 76 cm of mercury. The condenser tubes are 28 mm inside diameter, 4 mm thick and water flows through tubes with a speed of 3 m/s and inlet temperature 20 degree Celsius. All the steam is condensed, the condensate is saturated water and temperature of cooling water at exit is 5 degree Celsius less than the condensate temperature. Assuming that overall coefficient of heat transfer is 4 k W/m^{2 }degree, determine the mass of cooling water circulated

a) 746.13 kg/s

b) 646.13 kg/s

c) 546.13 kg/s

d) 446.13 kg/s

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_{S }= 76 – 66/76 (1.0133) = 0.133 bar. From energy balance, heat loss by steam = heat gained by cooling water.

7. The curve of effectiveness versus NTU parameters indicates the relationship between

(i) Effectiveness

(ii) NTU _{MAX}

(iii) C _{MIN}/C _{MAX}

Identify the correct statements

a) 1 and 2

b) 1, 2 and 3

c) 2 only

d) 3 only

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8. Hot water having specific heat 4200 J/kg K flows through a heat exchanger at the rate of 4 kg/min with an inlet temperature of 100 degree Celsius. A cold fluid having a specific heat 2400 J/kg K flows in at a rate of 8 kg/min and with inlet temperature 20 degree Celsius. Make calculations for maximum possible effectiveness if the fluid flow conforms to parallel flow arrangement

a) 0.533

b) 0.633

c) 0.733

d) 1

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9. Consider the above problem, make calculations for maximum possible effectiveness if the fluid flow conforms to counter flow arrangement

a) 1.23

b) 0.5

c) 1

d) 0.465

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10. A counter flow heat exchanger is used to col 2000 kg/hr of oil (c _{p} = 2.5 k J/kg K) from 105 degree Celsius to 30 degree Celsius by the use of water entering at 15 degree Celsius. If the overall heat transfer coefficient is expected to be 1.5 k W/m^{2 }K, find out the water flow rate. Presume that the exit temperature of the water is not to exceed 80 degree Celsius

a) 1680.2 kg/hr

b) 1580.2 kg/hr

c) 1480.2 kg/hr

d) 1380.2 kg/hr

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## Interview MCQ Set 2

1. In CI engine, combustion occurs by the high temperature produced by the compression of the air.

a) True

b) False

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2. In the CI engine, the intake is air alone and the fuel is injected at high pressure in the form of fine droplets at the start of compression.

a) True

b) False

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3. The phases of CI engine combustion are

a) ignition delay period

b) period of rapid combustion

c) period of controlled combustion

d) all of the mentioned

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4. The rate of pressure rise depends on the amount of fuel present at the end of delay period, degree of turbulence, fineness of atomization and spray pattern.

a) True

b) False

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5. The factors affecting combustion in CI engine are

a) ignition quantity of fuel

b) injection pressure of droplet size

c) injection advance angle

d) all of the mentioned

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6. The factors affecting combustion in CI engine are

a) compression ratio

b) intake temperature

c) jacket water temperature

d) all of the mentioned

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7. The factors affecting combustion in CI engine are

a) intake pressure

b) engine speed

c) load and air to fuel ratio

d) all of the mentioned

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8. Towards the end of the compression stroke when injection of the fuel into the combustion chamber commences, the quantity of fuel discharged is spread out over a predetermined period.

a) True

b) False

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9. The rate of burning does not depends on the relative movement of the burning droplets to the surrounding air charge.

a) True

b) False

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10. In CI engines fuel is injected into the combustion chamber at about 15ºC ___________ TDC during compression stroke.

a) after

b) before

c) at

d) none of the mentioned

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## Interview MCQ Set 3

1. The coefficients of the polynomials P (S) and Q (S) in the network function N (S) are ________ for passive network.

a) real and positive

b) real and negative

c) complex and positive

d) complex and negative

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2. The scale factor is denoted by the letter?

a) G

b) H

c) I

d) J

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_{o}to b

_{o}.

3. The zeros in the transfer function are denoted by?

a) 3

b) 2

c) 1

d) 0

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4. The poles in the transfer function are denoted by?

a) x

b) y

c) z

d) w

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5. The network function N (S) becomes _________ when s is equal to anyone of the zeros.

a) 1

b) 2

c) 0

d) ∞

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6. The N (S) becomes ________ when s is equal to any of the poles.

a) ∞

b) 0

c) 1

d) 2

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7. If the poles or zeros are not repeated, then the function is said to be having __________ poles or ________ zeros.

a) simple, multiple

b) multiple, simple

c) simple, simple

d) multiple, multiple

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8. If the poles or zeros are repeated, then the function is said to be having __________ poles or ________ zeros.

a) multiple, multiple

b) simple, simple

c) multiple, simple

d) simple, multiple

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9. If the number of zeros (n) are greater than the number of poles (m), then there will be _________ number of zeros at s = ∞.

a) n

b) m

c) n-m

d) n+m

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10. If the number of poles (m)are greater than the number of zeros (n), then there will be _________ number of zeros at s = ∞.

a) m+n

b) m-n

c) m

d) n

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## Interview MCQ Set 4

1. How many computation rounds does the simplified AES consists of?

a) 5

b) 2

c) 8

d) 10

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2. For the case of Mixed Columns and Inverse Mixed Columns, is it true that b(x) = a^{-1}(x)mod(x^{4} + 1)

where a(x) = {03}x^{3} + {01}x^{2} + {01}x + {02} and b(x) = {0B}x^{3} + {0D}x^{2} + {09}x + {0E}

a) True

b) False. The expression for a(x) is wrong.

c) False. The expression for b(x) is wrong.

d) False. Both a(x) and b(x) are faulty.

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3. For an inputs key of size 128 bits constituting of all zeros, what is w(7) ?

a) {62 63 63 63}

b) {62 62 62 62}

c) {00 00 00 00}

d) {63 63 63 62}

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4. On comparing AES with DES, which of the following functions from DES does not have an equivalent AES function?

a) f function

b) permutation p

c) swapping of halves

d) xor of subkey with function f

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5. On perform the Mix Columns transformation for the sequence of bytes “77 89 AB CD” we get output

a) {01 55 EE 4A}

b) {0A 44 EF 4A}

c) {08 55 FF 3A}

d) {09 44 DD 4A}

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6.On perform the Mix Columns transformation for the sequence of bytes “67 89 AB CD” we get output

a) {08 55 FF 18}

b) {28 45 EF 08}

c) {28 45 FF 18}

d) {25 35 EF 08}

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7. Is the following matrix the inverse matrix of the matrix used in the mix columns step?

x^{3} + 1 x

x x^{3} + 1

a) Yes

b) No

c) Can’t say

d) Insufficient Information

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8. For the cipher text 0000 0111 0011 1000 and Key 0110 1111 0110 1011, apply the Simplified AES to obtain the plaintext. The plain text is

a) 0110 1001 0111 0001

b) 0110 1111 0110 1011

c) 0010 1001 0110 1011

d) 1111 0101 0111 1111

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9. What is the block size in the Simplified AES algorithm?

a) 8 bits

b) 40 bits

c) 16 bits

d) 36 bits

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10. What is the key size in the S-AES algorithm?

a) 16 bits

b) 32 bits

c) 24 bits

d) None of the mentioned

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11. S-AES and S-DES were both developed by the same person as an educational cryptography system to teach students

a) True

b) False

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12. Which of the following is a faulty S-AES step function?

a) Add round key

b) Byte substitution

c) Shift rows

d) Mix Columns

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## Interview MCQ Set 5

1. What is the thermal conductivity of asphalt in W/m K?

a) 0.064

b) 0.063

c) 0.062

d) 0.061

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2. Which one is having highest thermal conductivity?

a) Silver

b) Copper

c) Glass

d) Earth

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3. What is the thermal conductivity of magnetite in W/m K?

a) 3.7

b) 3.8

c) 3.9

d) 4.0

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4. Which one is having lowest thermal conductivity?

a) Furnace

b) Wool

c) Saw dust

d) Glass wool

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5. What is the thermal conductivity of coal in W/m K?

a) 0.25

b) 0.26

c) 0.27

d) 0.28

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6. What is the thermal conductivity of cotton in W/m K?

a) 0.03

b) 0.04

c) 0.05

d) 0.06

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7. Which one is having highest thermal conductivity?

a) Brass

b) Aluminum

c) Cast iron

d) Steel

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8. What is the thermal conductivity of apple in W/m K?

a) 0.513

b) 0.613

c) 0.713

d) 0.813

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9. What is the thermal conductivity of ice in W/m K?

a) 1.55

b) 1.66

c) 1.77

d) 1.88

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10. Which one is having lowest thermal conductivity?

a) Ash

b) Ice

c) Freon

d) Water