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Machine Design, Materials, and Shop Practices > Basic Mechanical Engineering MCQ's > Flashcards

Basic Mechanical Engineering MCQ's Flashcards

(60 cards)

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1
Q

A flat surface can be produced by a lathe machine, if the cutting tool moves _____

A

perpendicular to the axis of rotation of workpiece

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2
Q

What is the function of cone pulley drive in lathe machines?

A

Change the spindle speed

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3
Q

Which of the following is a mechanism for mechanized movements of the carriage along
longitudinal axis?

A

Apron

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4
Q

The function of taper turning process is to ____

A

reduce the diameter of a workpiece along its length

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5
Q

The process of beveling sharp ends of a workpiece is called as ________

A

chamfering

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6
Q

In an isolated system, ________ can be transferred between the system and its
surrounding.

A

neither energy nor mass

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7
Q

Which of the following is an extensive property?

A

Volume

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7
Q

The extensive properties of a system, _______

A

depend upon the mass of the system

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7
Q

How is absolute pressure measured?

A

Gauge pressure + Atmospheric pressure

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7
Q

An isobaric process, has constant _____

A

pressure

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7
Q

Which of the following statements are false for reaction turbines?
1. Flow of water can be regulated without any losses
2. It works on the principle of impulse and reaction
3. They are suitable for low heads
4. Water flows at constant atmospheric pressure over the runner

A

1 and 4

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8
Q

Which of the following energy conversion devices convert heat into work?

A

I. C engines

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8
Q

Smoke tube boilers have large water to steam ratio, hence _____

A

are slow in operations

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8
Q

Lancashire boilers are ______

A

internally fired boilers

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9
Q

In four stroke cycle engine, cycle is completed in ______

A

two revolutions of the crankshaft

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10
Q

In roller bearings which type of rolling elements are used

A

Cylindrical rollers
Taper rollers
Spherical rollers
All of the above

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10
Q

Which type of bearings are known as anti friction bearings?

A

Rolling contact bearings

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10
Q

Cylindrical roller bearings have greater _____

A

radial load carrying capacity

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11
Q

Why is the load carrying capacity low in ball bearings?
1. Due to line contact between inner race and the ball
2. Due to greater axial dimensions
3. Due to less radial dimensions
4. Due to point contact between inner race and the ball

A

only 4

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12
Q

Determine torque transmitted on the pinion shaft if torque transmitted on gear shaft
is 20 Nm.
Consider Gear ratio = 4

A

5 Nm

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12
Q

Which of the following statements is/are true for gear drives?
a. They can be used for long centre distances
b. They are used to transmit power between non-intersecting and parallel shafts
c. They cannot be used for high reduction ratios
d. All of the above

A

They are used to transmit power between non-intersecting and parallel shafts

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12
Q

In which power transmitting drive polygon effect is observed?

A

Chain drive

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12
Q

Which of the following statements is/are true?
a. Jaw clutch is a positive clutch
b. The power transmitting capacity of a friction clutch is inversely proportional to the coefficient
of friction between contacting surfaces
c. Driving and driven plates in friction clutches are held together due to radial force applied by
the helical springs
d. All of the above

A

Jaw clutch is a positive clutch

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13
Q

What is meant by gear ratio?

A

The ratio of pinion speed and gear speed

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14
In stress-strain diagram, up to proportional limit ______
stress is directly proportional to strain
15
Which gears are used to connect two intersecting shaft axes?
Bevel gears
16
Deformation per unit length is called as ________
strain
17
Which of the following materials do not have a well defined yield point? a. Heat treated steel b. Concrete c. Carbon fiber d. All of the above
All of the above
18
Factor of safety is the ratio of _________ a. working stress and ultimate strength b. yield strength and endurance strength c. ultimate strength and yield strength d. yield strength and working stress
yield strength and working stress
19
The elongation of a bar is 0.5 mm, when a tensile stress of 200 N/mm2 acts on it. Determine original length of a bar if modulus of elasticity is 150 x 103. a. 375.93 mm b. 300 mm c. 360 mm d. None of the above
375.93 mm
20
Which of the following statements is/are true for alloy steels? a. They contain carbon more than 1.7% b. They are ductile c. They have low resilience and toughness d. All of the above
They are ductile
21
Which of the following is a ferrous alloy? a. Brass b. Aluminum alloys c. Cast steel d. All of the above
Cast steel
22
Copper when alloyed with zinc is known as a. Brass b. Bronze c. Babbits d. All of the above
Brass
23
The plastic materials which do not undergo chemical change when heated are ____ a. Thermoplasts b. Thermosets c. Both a. and b. d. None of the above
Thermoplasts
24
Which of the following is a characteristic of Polytetra-flouro-ethylene? a. High coefficient of friction b. Tough at high temperature c. Resistance to chemical attack d. All of the above
Resistance to chemical attack
25
Which of the following statements is/are true for mechanisms? a. A slider crank mechanism is formed, if one link in slider crank chain is fixed b. Three kinematic links joined together forms a mechanism c. Kinematic chain is a part of kinematic pair d. All of the above
A slider crank mechanism is formed, if one link in slider crank chain is fixed
26
Which body transmits force with negligible deformation? a. Elastic body b. Resistant body c. Deforming body d. All of the above
Resistant body
27
What is the primary function of mechanism? a. Power transmission b. Power absorption c. Force transmission d. Motion transmission
Motion transmission
28
Which of the following is an inversion of four bar chain? a. Coupled wheels of locomotive b. Whitworth quick return mechanism c. Reciprocating air compressor d. Hand pump
Coupled wheels of locomotive
29
What are the number of sliding and turning pairs in a slider crank mechanism? a. 1 sliding pair and 3 turning pairs b. 2 sliding pairs and 2 turning pairs c. 3 sliding pairs and 1 turning pair d. None of the above
1 sliding pair and 3 turning pairs
30
What is meant by drag in casting process? a. Upper part of casting flask b. Molten metal c. Lower part of casting flask d. Upper and lower part of casting flask
Lower part of casting flask
31
Casting replica used to make the cavity is called as a. Mould b. Pattern c. Cope d. None of the above
Pattern
31
The process of joining similar or dissimilar materials by heating them below 450oC using non-ferrous filler material is called as _____ a. Brazing b. Soldering c. Welding d. All of the above
Soldering
32
At forging temperature when a compressive force is applied on the material, it deforms a. elastically in the direction of least resistance b. elastically in the direction of maximum resistance c. plastically in the direction of least resistance d. plastically in the direction of maximum resistance
plastically in the direction of least resistance
33
What is the average temperature required for hot forging of aluminium alloys? a. 1100 oC to 1200 oC b. 350 oC to 525 oC c. 2000 oC to 2500 oC d. None of the above
350 oC to 525 oC
34
Which process squeezes metals into peaks and troughs with plastic deformation? a. Grooving b. Knurling c. Reaming d. None of the above
Knurling
35
Which of the following operations is/are performed on a lathe machine? a. Spot-facing b. Parting c. Reaming d. All of the above
Parting
36
The process of chamfering the entrance of a drilled hole is known as_____ a. counter-boring b. counter-sinking c. counter-fillet d. trepanning
counter-sinking
37
On drilling machine, which process is known as reaming? a. Enlargement of existing hole b. Hole made by removal of metal along the hole circumference c. Smoothly finishing and accurately sizing a drilled hole d. All of the above
Smoothly finishing and accurately sizing a drilled hole
38
Which of the following statements is/are false for machine tools? 1. Pillar drilling machine drills holes up to 75 mm 2. Regulating wheel is a component of surface grinding machine 3. Sensitive drilling machine is also known as bench drilling machine 4. The chuck of an internal grinding machine placed in tailstock is driven by an electric motor a. Only 1 b. 2 and 4 c. 1 and 3 d. All of the above
2 and 4
39
The radiation pyrometers work on the principle of ______ a. Newton's law b. Stefan Boltzmann's law c. Zeroth law d. None of the above
Stefan Boltzmann's law
40
Which of the following relations depict relation between Celsius and Fahrenheit scale? a. (oC / 5) = (oF – 32) / 9 b. (oC / 9) = (oF – 32) / 5 c. (oC / 32) = (oF – 9) / 5 d. None of the above
(oC / 5) = (oF – 32) / 9
41
According to Joule's law, the internal energy of a perfect gas is the function of absolute ______ a. density b. pressure c. temperature d. volume
temperature
41
According to Kelvin-Planck statement, it is impossible to construct a device operating on a cycle which transfers heat from ____ a. low pressure heat reservoir to high pressure reservoir b. low temperature heat reservoir to high temperature reservoir c. high pressure heat reservoir to low pressure reservoir d. high temperature heat reservoir to low temperature reservoir
low temperature heat reservoir to high temperature reservoir
42
Thermal efficiency of S.I. engines is low, due to ____ a. low compression ratio b. high compression ratio c medium compression ratio d. none
low compression ratio
42
Which of the following relations is true, for coefficient of performance (C.O.P)? a. (C.O.P)heat pump (C.O.P)refrigerator = 1 b. (C.O.P)heat pump – (C.O.P)refrigerator > 1 c. (C.O.P)heat pump – (C.O.P)refrigerator < 1 d. (C.O.P)heat pump – ( C.O.P)refrigerator = 0
(C.O.P)heat pump – (C.O.P)refrigerator = 1
43
Pump transfers input mechanical energy of an engine, into ______ a. pressure energy of a fluid b. kinetic energy of a fluid c. both a. and b. d. none of the above
both a. and b.
44
One ton of refrigeration is equal to ______ a. 120 B Th U/hr b. 200 B Th U/hr c. 1200 B Th U/hr d. 12000 B Th U/hr
12000 B Th U/hr
45
Which of the following protects penstock due to sudden variation of flow or velocity of water? a. Anchors b. Forebays c. Trash rack d. Surge tank
Surge tank
46
What is the function of a moderator? a. Increases the speed of neutrons b. Increases the speed of electrons c. Reduces the speed of neutrons d. Reduces the speed of electrons
Reduces the speed of neutrons

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