Top 16 Diploma 1st Year Engineering Questions And Answers

1. What is the Least count?

Ans. The smallest value that can be measured by a

measuring instrument is called least count.

2. What is Screw Pitch?

Ans. The linear distance moved by the screw-head in

one complete rotation is called screw pitch.

3. What is Specific Gravity?

Ans. The Specific Gravity of a solid is defined as the ratio

of the weight of any volume of that solid to the

importance of an equal volume of water at 4℃.

4. What is the total reading of the Screw Gauge, if

The major scale reading is 4mm, and the Circular scale

reading is 25? The minor count of the Screw Gauge is

0.01mm.

Ans. 4mm + 25×0.01mm

= 4mm + 0.25mm

= 4.25 mm.

5. What is the formula to calculate the Least count of a

Screw gauge?

Ans. Pitch ÷ Number of divisions on a circular scale.

6. What is the formula to calculate Vernier constant

of Vernier scale?

Ans. Value of 1 main scale division ÷ Total number

of divisions on the vernier scale.

7. What is the formula to calculate the volume of a

Hollow Cylinder?

Ans. V = π × ( D² - d² ) × l ÷ 4 cubic units.

V = Volume

D = Outer diameter

d = Inner diameter

l = Length

8. What is the formula to calculate the area of cross

section of a wire?

Ans. ( π × D² ÷ 4 ) square units.

D = Diameter of wire

9. What is the formula to calculate Specific Gravity

of a solid?

Ans. (W2–W1) ÷ {(W4–W1) – (W3–W2)}

W1 = weight of the empty bottle

W2 = weight of empty bottle + some sand

W3 = weight of empty bottle + some sand + water

filling the remainder

W4 = weight of the bottle filled with water

10. What is the unit of Specific Gravity?

Ans. It is a unitless quantity.

11. What is the zero error of an instrument?

Ans. When the zero marks of the Main scale and

Circular scales do not coincide; the instrument is said

to have zero error.

12. What is the total reading of the Slide Calipers, if

the Main scale reading is 1.5 cm, and the Vernier scale

reading is 8 ? Vernier constant of the Slide Calipers

is 0.01cm.

Ans. 1.5cm + 8×0.01cm

= 1.5cm + 0.08cm

= 1.58cm

13. What is the density of water at 4℃?

Ans. 1gm/cc.

14. What is Fule?

Ans: A fuel is a substance that can be combined with oxygen with the evolution of light and thermal energy that can be utilized for domestic and industrial heating.

15. What is a classification of a fuel?

Ans: Classification Of Fuels: (a) according to the physical state, they exist in nature and are manufactured.

16. What is the Calorific view of fuel?

 Ans: The calorific value of a fuel is the number of units of heat evolved during complete combustion of the unit weight of the power. For liquids and solids, it is usually expressed in Btu/1b or Cal/gm. 

 The calorific value may be expressed in two types (i) Gross calorific value (GCV) (ii) Net calorific value (NCV)

(a) Gross Calorific Value (GCV): The quantity of heat evolved by the combustion of unit quantity of fuel is its gross calorific value (GCV). Gross or higher calorific value is the quantity of heat liberated by combusting unit mass of energy in oxygen, the original material and the final product of combustion being at a reference temperature of 25°🌡️ and water obtained is in the liquid state.

(b) Net Calorific Value(NCV): Net Calorific Value (NCV) is the quantity of heat evolved when a unit quantity of fuel is burnt in oxygen, the original material, and the final products of combustion being at a reference temperature of 25°C 🌡️and the water obtained from the fuel is in the vapor state.