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51.

For platinum thermocouples lead wires are made of

A.	iron and copper	B.	copper and copper-nickel alloy
C.	nickel and iron	D.	tin and nickel.

52.

Invar is a

A.	iron-nickel alloy containing about 36% nickel	B.	copper-nickel alloy containing about 36% nickel
C.	zinc-nickel alloy containing about 36% nickel	D.	tin-nickel alloy containing about 36% nickel

53.

Monel is an alloy of

A.	Ni (69%) and Cu (28%)	B.	Ni (69%) and Cr (31%)
C.	Cu (55%) and Sn (45%)	D.	Fe (90%) and Cr (10%)

54.

Constantan is an alloy of

A.	Cu (55%) and Sn (45%)	B.	Cu (55%) and Ni (44%)
C.	Fe (55%) and Ni (44%)	D.	Pt (90%) and Rh (10%)

55.

Thermocouple in a well behaves as a true

A.	first-order system	B.	multiple first-order system
C.	underdamped second-order system	D.	overdamped second-order system

56.

The e.m.f. generated in thermocouples is of the order of

A.	volts	B.	millivolts
C.	microvolts	D.	kilovolts

57.

Thermopile is used for the measurement of

A.	current	B.	e.m.f.
C.	temperature	D.	flow rate

58.

Bolometer works on the principle of

A.	change of electrical resistance with change in temperature	B.	volumetric expansion of mercury with increase in temperature
C.	increase of vapour pressure with increase in temperature	D.	linear expansion with increase in temperature

59.

Bolometer is used for the measurement of

A.	temperature	B.	flow rate
C.	current	D.	e.m.f.

60.

Resistance thermometers work on the principle of

A.	increase of electrical resistance with increase in temperature	B.	increase in vapour pressure with increase in temperature
C.	linear expansion of metal with increase in temperature	D.	e.m.f. generated in a single homogeneous wire with increase in temperature