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521.

The diameter of a round bar with close tolerances is quickly measured by

A.	Slip gauges	B.	External micrometer
C.	Vernier caliper	D.	Snap gauge
E.	Any of the above

522.

While cutting double start threads of pitch 2 mm on a lathe, the cutting tool will advance by

B.	1 mm/revolution
C.	2 mm/revolution	D.	4 mm/revolution
E.	8 mm/revolution

523.

A drilling machine has spindle speeds from 70 to 800 rpm in eight steps. The fourth speed from the lowest will be

A.	175 rpm	B.	198 rpm
C.	245 rpm	D.	300 rpm
E.	340 rpm

524.

The process for producing smooth surfaces by plastically moving away the raised micro-irregularities on the surface and passing it into the microcavities is known as

A.	Buffing	B.	Burnishing
C.	Tumbling	D.	Super finishing
E.	Polishing

525.

Kerosene is used as a cutting fluid while machining

A.	Aluminium	B.	Magnesium
C.	Brass	D.	Copper
E.	Low carbon steel

526.

For a peripheral speed of 35 m/s, a grinding wheel of 800 mm diameter must rotate at

A.	60 rpm	B.	85 rpm
C.	435 rpm	D.	835 rpm
E.	1600 rpm

527.

Straight fluted drills are used for

A.	Brass and soft materials	B.	Very hard materials
C.	Brittle materials	D.	Amorphous materials
E.	Ferrous materials

528.

For aluminium, the cutting speed on lathe is around

A.	30 m/min	B.	100 m/min
C.	150 m/min	D.	300 m/min
E.	1000 m/min

529.

For soft steel the cutting speed for lathe operations is around

A.	30 m/min	B.	100 m/min
C.	150 m/min	D.	300 m/min
E.	1000 m/min

530.

The cutting speed is usually low in case of

A.	Soft material	B.	Regular shaped materials
C.	Castings	D.	Stepped shafts
E.	None of the above