TRB/TNEB Mechanical Mock Test

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TRB/TNEB Mechanical Mock Test - VI

This Test series useful for who are preparing for various technical examinations like TRB Mechanical, TNEB-AE, TNPSC-AE, SSC-JE, NLC GET, GATE, ESE and State PSC and entrance exams like TANCET.

Match the List – I (Material’s) and List – II (Type of Joining)

2 points

A-2; B-5; C-1; D-3

A-6; B-3; C-4; D-4

A-4; B-1; C-6; D-2

A-5; B-4; C-2; D-6

Clear selection

The molecular weight of vinyl chloride is 62.5 thus the molecular weight of a polyvinyl chloride with a degree of polymerization of 20000 is

2 points

20000

3.125 x 10^3

320

12.5 x 10^5

Clear selection

2 points

Maxima at x = 3; Minima at x = -2

Maxima at x =3; Minima at x =2

Maxima at x =-2; Minima at x=3

Maxima at x = -2; Minima at x =3

Clear selection

2 points

2, 3 and 4

1, 2, 3 and 4

1, 2 and 4

1, 3 and 4

Clear selection

A flat end foot step bearing supports a vertical shaft of 150 mm diameter rotating at 10 rad/s. The shaft carries a vertical load of 20kN. Assuming uniform pressure distribution and co-efficient of friction equal to 0.05, the power lost in friction is

2 points

750 W

1125 W

500 W

1000 W

Clear selection

A machine of 100 kg mass has 20 kg rotor with 0.5 mm eccentricity. The mounting springs have stiffness 85 kN/m and damping is negligible. If the operating speed is 20π rad/s and the unit is constrained to move vertically, the dynamic amplitude of the machine will be

2 points

1.0 x 10^-4 m

2.540 x 10^-4 m

1.270 x 10^-4 m

0.470 x 10^-4 m

Clear selection

2 points

ce^x

Unsolvable as equation is non-linear

y= 〖-x〗^3/3+c

y=1/(x+c)

Clear selection

On a hot day at Chennai, an oil tanker was loaded with 40000 liters of diesel fuel. The tanker was then driven to Ooty where the temperature was 20K lower than in Chennai and the entire load was delivered Ooty. If the co-efficient of volume expansion for diesel fuel is 1 x 10^-3/K, the quantity of diesel delivered at Ooty was

2 points

39200 litres

39000 liters

40800 litres

40000 litres

Clear selection

2 points

1, 2 and 3

2 and 3 only

1 and 3 only

1 and 2 only

Clear selection

In a plunge grinding operation, the work piece is 10 mm wide, the wheel is of 20 cm diameter and 2 cm wide. The wheel speed is 3000 rpm and the table speed is 2.5 m/min. If the depth of cut is 0.02 mm, grain density is 250/cm^2 and the grinding forces are 20 N tangential and 38 N thrust, the specific energy is

2 points

7.54 x 10^6N/mm^2

7.54 x 10^4N/mm2

75.4 x 10^4N/mm^2

75.4 x 10^6N/mm^2

Clear selection

A shell is fired from cannon with a speed ‘v’ at an angle θ with the horizontal direction. At the highest point in its path, it explodes into two pieces of equal mass. One of the pieces retraces its path to the cannon. The speed of other piece immediately after the explosion is

2 points

√(3/2) vcos θ

2vcos θ

(3/2)vcos θ

3vcos θ

Clear selection

2 points

I = 0; Singularities set = φ

I = 0; Singularities = {±(2n+2)/2 π;n=0,1,2…}

I = π/2; Singularities = {±nπ;n=0,1,2…}

None of the above

Clear selection

2 points

Both Statement (I) and Statement (II) are individually true but Statement (II) is NOT the correct explanation of Statement (I)

Statement (I) is false but Statement (II) is true

Statement (I) is true but Statement (II) is false

Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I)

Clear selection

In an elliptical trammel, the length of the connecting the two sliders is 100 mm. The tracing pen is placed on 150 mm extension of this link. The major and minor axes of the ellipse traced by the mechanism would be

2 points

500 mm and 300 mm

250 mm and 150 mm

250 mm and 100 mm

500 mm and 200 mm

Clear selection

Match the items in Column – I and II

2 points

A-1;B-3;C-2;D-4

A-1;B-4;C-3;D-2

A-1;B-4;C-2;D-3

A-4;B-1;C-2;D-3

Clear selection

Gray cast iron blocks 200 x 100 x 10 mm are to be cast in sand molds. Shrinkage allowance for pattern making is 1%. The ratio of the volume of pattern to that of the casting will be

2 points

0.99

0.97

1.03

1.01

Clear selection

An aeroplane travels at 400 km/hr at sea level where the temperature is 15℃. The velocity of the aeroplane at the same Mach number of altitude where a temperature of -25℃ is prevailing, would be

2 points

400.10 km/hr

130.6 km/hr

126.78 km/hr

369.4 km/hr

Clear selection

2 points

2 and 3

1, 2 and 4

1, 2, 3 and 4

2, 3 and 4

Clear selection

A cantilever beam, 2m in length, is subjected to a uniformly distributed load of 5kN/m. If E = 200 GPa and I = 1000cm^4, the strain energy stored in the beam will be

2 points

10 N-m

12 N-m

8 N-m

7 N-m

Clear selection

Match the List – I (Physical Quantity) with List – II (Dimensions)

2 points

A-3;B-1;C-5;D-3

A-1;B-1;C-4;D-3

A-3;B-5;C-5;D-2

A-1;B-1;C-2;D-3

Clear selection

The probability that a screw manufactured by a company is defective is 0.1. The company sells screws in packets containing 5 screws and gives a guarantee of replacement if one or more screws in the packet are found to be defective. The probability that a packet would have to be replaced is

2 points

0.9

0.59

0.40

Clear selection

Match the Column – I (Defects in Drawing) with Column – II (Causes)

2 points