Explore topic-wise MCQs in Php.

This section includes 2095 Mcqs, each offering curated multiple-choice questions to sharpen your Php knowledge and support exam preparation. Choose a topic below to get started.

1.

Which one of the following laws will not contribute to the Maxwell’s equations?

A. Gauss law
B. Faraday law
C. Ampere law
D. Curie Weiss law
Answer» E.
2.

The propagation of the electromagnetic waves can be illustrated by

A. Faraday law
B. Ampere law
C. Flemming rule
D. Coulomb law
Answer» D. Coulomb law
3.

Find the curl of E when B is given as 15t.

A. 15
B. -15
C. 7.5
D. -7.5
Answer» C. 7.5
4.

The active period of landfill range from ____________ years.

A. 10-20
B. 20-30
C. 30-40
D. 40-50
Answer» B. 20-30
5.

Hydrological investigation has to be done for ___________

A. Landfill design
B. Analysis
C. Recovery
D. Collection of hydrological data
Answer» E.
6.

Subsoil investigation has to be done for __________

A. Landfill design
B. Analysis
C. Recovery
D. Transport
Answer» B. Analysis
7.

Site Hazard Assessment always necessary.

A. True
B. False
Answer» C.
8.

Under MTCA, the process for cleaning up a hazardous waste site is ____________

A. SHA
B. NPL
C. HAP
D. SHP
Answer» B. NPL
9.

What is standard deviation value for constant area?

A. 0
B. 1
C. -1
D. None of the mentioned
Answer» B. 1
10.

For a local enhancement using mean and variance, there is one condition: σs(x, y) ≤ k2DG, where, MDG is global standard deviation, k2 a positive constant and σs(x, y) a measure of contrast at point (x, y). Then, which fact is true for k2 if its values is greater than 1.0?

A. Enhancement is being done on light areas
B. Enhancement is being done on dark areas
C. Enhancement is being done independent of value of k0
D. None of the mentioned
Answer» B. Enhancement is being done on dark areas
11.

For a local enhancement using mean and variance, there is one condition: σs(x, y) ≤ k2DG, where, MDG is global standard deviation, k2 a positive constant and σs(x, y) a measure of contrast at point (x, y). Then, which fact is true for k2 if its values is less than 1.0?

A. Enhancement is being done on light areas
B. Enhancement is being done on dark areas
C. Enhancement is being done independent of value of k0
D. None of the mentioned
Answer» C. Enhancement is being done independent of value of k0
12.

For a local enhancement using mean and variance, there is one condition: ms(x, y) ≤ k0 MG, where, MG is global mean, k0 a constant and ms(x, y) a measure of gray value as light or dark at point (x, y). Then, which fact is true for k0?

A. It is a negative constant with values less than -1.0
B. It is a positive constant with values less than 1.0
C. It is an integer constant with values between -1.0 and 1.0
D. None of the mentioned
Answer» C. It is an integer constant with values between -1.0 and 1.0
13.

Let us suppose an image containing a quite small square under a large dark square with both having very close gray level values. If an image contains some of this such that the small squares can’t be visualized and some noise blurred enough to reduce its noise content as shown in fig. below, Which of the following method would be preferred for obtaining the small square clear enough? Figure: original image.

A. Global histogram equalization
B. Local histogram equalization
C. All of the mentioned
D. None of the mentioned
Answer» C. All of the mentioned
14.

In Histogram Matching or Specification, z = G-1[T(r)], r and z are gray level of input and output image and T & G are transformations, to confirm the single value and monotonous of G-1 what of the following is/are required?

A. G must be strictly monotonic
B. G must be strictly decreasing
C. All of the mentioned
D. None of the mentioned
Answer» B. G must be strictly decreasing
15.

In Histogram Matching r and z are gray level of input and output image and p stands for PDF, then, what does pz(z) stands for?

A. Specific probability density function
B. Specified pixel distribution function
C. Specific pixel density function
D. Specified probability density function
Answer» E.
16.

The technique of Enhancement that has a specified Histogram processed image as result, is called?

A. Histogram Linearization
B. Histogram Equalization
C. Histogram Matching
D. None of the mentioned
Answer» D. None of the mentioned
17.

The blind risers are connected at top of the cope.

A. True
B. False
Answer» B. False
18.

Blind risers promote directional solidification better than the open risering.

A. True
B. False
Answer» B. False
19.

A blind riser can be placed only in specific positions.

A. True
B. False
Answer» C.
20.

The cavity of the blind riser is ______________

A. Square
B. Desired shape
C. Round
D. Rhombus
Answer» D. Rhombus
21.

_________ is exposed to atmosphere in open riser.

A. Top end
B. Bottom end
C. Partial upper end
D. Partial bottom end
Answer» B. Bottom end
22.

In case of ductile materials, plastic deformation starts when yield strength is exceeded.

A. True
B. False
Answer» B. False
23.

In the case of ductile materials, material is removed by plastic deformation.

A. True
B. False
Answer» B. False
24.

MRR increases with abrasive flow rate increase.

A. True
B. False
Answer» B. False
25.

Abrasive particles are suspended in the carrier gas.

A. True
B. False
Answer» B. False
26.

Products made through casting can avoid joining process.

A. True
B. False
Answer» B. False
27.

Casting provides uniform directional properties.

A. True
B. False
Answer» B. False
28.

Which of the following is not a metal removing process?

A. Grinding
B. Milling
C. Swaging
D. Hobbing
Answer» D. Hobbing
29.

Which of the following is not a type of a foundry?

A. Captive foundry
B. Jobbing foundry
C. Semi Production foundry
D. Auto production foundry
Answer» E.
30.

In a lifting machine, the effort required to lift loads of 200N and 300N were 50N and 60N respectively. If the velocity ratio of the machine is 20 determine effort loss in friction at 200 N.

A. 30 N
B. 35 N
C. 40 N
D. 45 N
Answer» D. 45 N
31.

In a lifting machine, the effort required to lift loads of 200N and 300N were 50N and 60N respectively. If the velocity ratio of the machine is 20 determine efficiency to load of 200 N.

A. 10 %
B. 15 %
C. 20 %
D. 25 %
Answer» D. 25 %
32.

A machine raised a load of 360 N through a distance of 200 mm. The effort, a force of 60 N moved 1.8 m during the process. Calculate effect of friction.

A. 10 N
B. 20 N
C. 30 N
D. 40 N
Answer» C. 30 N
33.

A machine raised a load of 360 N through a distance of 200 mm. The effort, a force of 60 N moved 1.8 m during the process. Calculate efficiency at this load.

A. 44.44%
B. 55.55%
C. 66.66%
D. 77.77%
Answer» D. 77.77%
34.

A machine raised a load of 360 N through a distance of 200 mm. The effort, a force of 60 N moved 1.8 m during the process. Calculate mechanical advantage.

A. 6
B. 7
C. 8
D. 9
Answer» B. 7
35.

Find the bandwidth and total output offset voltage of a voltage follower? The following are the specifications for the op-amp 741: A=200000, fo =5hz and supply voltage =±15v.

A. fF = 1000hz, VooT = ± 7.5µv.
B. fF = 100khz, VooT = ± 7.5µv.
C. fF = 10khz, VooT = ±7.5µv.
D. fF = 1000khz, VooT = ± 7.5µv.
Answer» E.
36.

Find the input and output voltage in voltage follower circuit?

A. Vin=2v and Vout = 3v
B. Vin=10v and Vout = 11v
C. Vin=9v and Vout = 9v
D. Vin=4v and Vout = 7v
Answer» D. Vin=4v and Vout = 7v
37.

Which is preferred to attain higher input resistance and the output amplitude equal to input?

A. Voltage follower
B. Voltage series feedback amplifier
C. Voltage shunt feedback amplifier
D. Inverter
Answer» B. Voltage series feedback amplifier
38.

What is the gain of voltage follower?

A. Gain > ∞
B. Gain –>1
C. Gain <1
D. Gain –>∞
Answer» C. Gain <1
39.

How are the saturation voltage specified on the manufacture’s datasheet?

A. Negative voltage
B. Output voltage swing
C. Supply voltage
D. None of the mentioned
Answer» C. Supply voltage
40.

Find the input and output resistance for the circuit shown.Specification for 741 op-amp : A=400000 ; Ri = 33MΩ; Ro = 60Ω;RF = 11kΩ; R1 = 2kΩ; Supply voltage = ± 15v; Maximum output voltage swing = ± 13v.

A. RIF = 66MΩ, ROF = 30Ω
B. RIF = 30MΩ, ROF = 6kΩ
C. RIF = 15kΩ, ROF = 50MΩ
D. None of the mentioned
Answer» B. RIF = 30MΩ, ROF = 6kΩ
41.

Which of the following statements about Velox boiler is FALSE?

A. It starts quickly
B. It is compact
C. Combustion rates are low
D. Pressurized air is used
Answer» D. Pressurized air is used
42.

Which of the following statements about super-critical is TRUE?

A. It only needs preheater and superheater
B. It only needs economizer and preheater
C. It only needs economizer and superheater
D. It only needs preheater
Answer» B. It only needs economizer and preheater
43.

Which of the following statements about Benson boiler is correct?

A. It requires large surface area
B. It is prone to explosions more than other boilers
C. It takes a lot of time to start
D. It is lighter than other boilers
Answer» E.
44.

What is the maximum working pressure obtained by a commercial Benson boiler?

A. 300 atm
B. 400 atm
C. 500 atm
D. 600 atm
Answer» D. 600 atm
45.

Which of the following statements is FALSE about Benson boiler?

A. Bubble formation in the heating tubes is prevented by slow heating
B. It is a forced circulation boiler
C. Oil is used as fuel
D. Feed water is compressed to 235 bar
Answer» B. It is a forced circulation boiler
46.

The main drawback of LaMont boilers is _____

A. limited capacity of evaporating drum
B. bubble formation on the inner surface of heating tubes
C. hindrance in the flow of hot gases
D. radiant superheater decreases the efficiency
Answer» C. hindrance in the flow of hot gases
47.

In LaMont boilers, the circulation of water is maintained by a centrifugal pump which is driven by a steam turbine in which steam is fed from the boiler itself.

A. True
B. False
Answer» B. False
48.

Which of the following is FALSE about high pressure boilers?

A. They are compact
B. Heat of combustion utilized more effectively
C. Heat is saved by evaporating water below critical pressure
D. Pumps are used to circulate water
Answer» D. Pumps are used to circulate water
49.

Which of the following heating methods is NOT used in high pressure boilers?

A. Evaporation of water above critical pressure of steam
B. Decreasing gas velocity (improves heat transfer coefficient)
C. Increasing water velocity inside tube (improves heat transfer coefficient)
D. Mixing of water with superheated steam
Answer» C. Increasing water velocity inside tube (improves heat transfer coefficient)
50.

Which of the following is NOT a unique feature of high pressure boiler?

A. Water circulation method
B. Tubing type
C. Firing method
D. Improved method of heating
Answer» D. Improved method of heating