Thermal efficiency of S.I. engines is low, due to ____

Which of the following relations is true, for coefficient of performance (C.O.P)?

According to Kelvin-Planck statement, it is impossible to construct a device operating on a cycle which transfers heat from ____

   According to Joule's law, the internal energy of a perfect gas is the function of absolute ______

Which of the following relations depict relation between Celsius and Fahrenheit scale?

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

 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

 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

The process of chamfering the entrance of a drilled hole is known as_____

 

a. counter-boring

b. counter-sinking

c. counter-fillet

d. trepanning

Which of the following operations is/are performed on a lathe machine?

 

a. Spot-facing

b. Parting

c. Reaming

d. All of the above

Which process squeezes metals into peaks and troughs with plastic deformation?

 

a. Grooving

b. Knurling

c. Reaming

d. None of the abov