BSNL TTA Recruitment Question Paper with Answer

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Hello, here I am providing you the question paper and answers of the BSNL TTA recruitment as under:

The main scale of a vernier calliper is ruled in 1 mm units. The vernier scale is 49 mm long and divided in 50 units. The resolution of the vernier calliper is
a. 0.002 mm
b. 0.005 mm
c. 0.01 mm
d. 0.02 mm

A frequency counter with a gating time of 50 ms counts 1254 cycles of an input square wave. The frequency of the input wave is
a. 39.87 Hz
b. 62.70 Hz
c. 1.254 kHz
d. 25.08 kHz

A data acquisition system with the input range of ± 5.0 V has a 12-bit ADC in it. The resolution of the system is approximately
a. 0.24 mV
b. 0.48 mV
c. 1.22 mV
d. 2.44 mV

Wattmeters are based on the principle of
a. permanent magnet moving coil meter
b. electrodynamic meter
c. electrostatic meter
d. moving iron meter

The resolution of a Gray-coded optical shaft encoder with 10-bit output is approximately
a. 0.098°
b. 0.176°
c. 0.225°
d. 0.352°

A positively charged object is placed in the centre of a room with a uniform magnetic field. If the magnetic field is pointing east, the object will
a. move east
b. move north
c. move south
d. remain stationary

The input impedance of a quarter-wave long short-circuited lossless transmission line is
a. purely reactive
b. purely resistive
c. infinite
d. dependent on the characteristic impedance of the line

For a plane wave propagating in the free space,
a. the electric and magnetic fields are in
b. the electric and magnetic fields are out of
c. the magnetic field amplitude is inversely

Which of the following materials has the largest energy gap between the conduction band and the valence band?
a. Gold
b. Silicon
c. Doped germanium
d. Porcelain

The area of hysteresis loop in a ferromagnetic material is a measure of
a. loss of energy
b. loss of magnetic domain
c. loss of magnetic dipole
d. loss of eddy currents

If a tetra-valent impurity is added to a pure silicon crystal at room temperature, it becomes
a. a p-type semiconductor
b. an n-type semiconductor
c. an npn-type semiconductor.
d. an insulator

An RTD having a sensitivity of 0.4 /°C is connected in a dc bridge having 100 fixed resistors in other three arms. The bridge supply is 5.4 V with the RTD connected to zero potential and the bridge is balanced at 0°C. At room temperature the bridge unbalanced output voltage is 0.2 V with the RTD side of the output being positive. The room temperature is
a. 6.4°C
b. 15°C
c. 25°C
d. 40°C


BSNL TTA paper and answer:

1. A brick laid with its length across the wall is

known as a

a. stretcher

b. header

c. closer

d. bat

2. Which of the following is not a mobile crane

type?

a. Bottom slewing tower crane

b. Telescopic-boom truck mounted crane

c. Crawler crane

d. Lattice-boom truck mounted crane

3. A principal plane is a plane of

a. minimum tensile stress

b. maximum tensile stress

c. maximum shear stress

d. zero shear stress

4. (i) Rapid hardening Portland cement is used

in mass concrete construction for lowering

the heat of hydration.

blended cement.

(ii) Rapid hardening Portland cement is

Which of the following option is correct?

a. (i) is false and (ii) is true

b. (i) is true and (ii) is false

c. Both (i) and (ii) are false

d. Both (i) and (ii) are true

5. Which of the following statement is true?

a. The nominal dimension of a brick is

b. The nominal dimension of a brick is less

c. The nominal dimension of a brick is equal

greater than its specified dimension by

thickness of the mortar joint.

than its specified dimension by thickness

of the mortar joint.

to its specified dimension.
d. The nominal dimension of a brick is less

than its specified dimension by twice the

thickness of the mortar joint.

6. Which of the following equipment is used

primarily to excavate below the natural ground

surface on which it rests?

a. Dozer

b. Scrapper

c. Hoe

d. Jaw crusher

7. The phenomenon in which, some of the water

in the mix tends to rise to the surface of

freshly placed concrete is known as 1

a. flash set

b. bleeding

c. setting

d. hydration

8. In a network diagram, the early start time of an

activity is

a. the minimum of the late finish times of all

b. the minimum of the early finish times of

c. the maximum of the late finish times of all

d. the maximum of the early finish times of

9. Which of the following compound is most

widely used as accelerating admixture in

concrete?

a. Sugar

b. Calcium chloride

c. Soluble zinc salts

d. Synthetic detergents

10. Which method of compaction is appropriate

for sand?

a. Impact

b. Pressure

c. Vibration

d. Kneading

its immediate predecessors

all its immediate predecessors

its immediate predecessors

all its immediate predecessors
11. Partial safety factor for concrete and steel in

limit state method of design of RC structures

are assumed as

a. 1.35 and 1.2 respectively

b. 1.14 and 1.25 respectively

c. 1.08 and 1.25 respectively

d. 1.5 and 1.15 respectively

12. Which of the following is not a soft wood?

a. Oak

b. Fir

c. Pine

d. Spruce

13. In a network diagram, the total float of an

activity is equal to

a. (Late finish time) — (Late start time)

b. (Late finish time) — (Early finish time)

c. (Early finish time) — (Early start time)

d. (Late start time) — (Early finish time)

14. As per IS 456 : 2000, the maximum spacing of

steel bars in a reinforced concrete solid slab is

a. 300 mm

b. 450 mm

c. 3 times effective depth or 300mm

d. 3 times the effective depth

15. Which of the following is fly ash based

blended cement?

a. Portland slag cement

b. Low-heat Portland cement

c. Portland pozzolana cement

d. Ordinary Portland cement

16. Which of the following test is performed on

hardened concrete to assess the hardness of its

surface?

a. Rebound hammer test

b. Rebound hammer test

c. Initial surface absorption test

d. Flexural test

17. In a PERT network, the optimistic time,

pessimistic time and most likely time of an

activity are 4 days, 16 days and 7 days

respectively. What is the value of the expected

duration of the activity?

a. 27 days

b. 8 days

c. 12 days

d. 19 days

18. (i) The addition of fly ash in concrete lowers

(ii) The addition of fly ash in concrete reduces

the heat of hydration in concrete.

its permeability. Which of the following

option is correct?

whichever is less

a. (i) is false and (ii) is true

b. (i) is true and (ii) is false

c. Both (i) and (ii) are false

d. Both (i) and (ii) are true

19. The crack resulting in lengthwise separation of

wood, occurring between and parallel to

annual rings is known as

a. check

b. knot

c. split

d. shake

20. Which of the following compound is mainly

responsible for the early strength development

of hydrated Portland cement?

a. C3S

b. C2S

c. C3A

d. C4AF