022.01 Sensors and Instruments

Question 1

A magnet rotor is used in a(n) (mechanical/electric/electronic)​ tachometer.

Answer 1

A magnet rotor is used in a(n) (electric) tachometer.

Question 2

A(n) (fuel pressure/manifold pressure/oil pressure)​ gauge utilises an aneroid pressure diaphragm.

Answer 2

A(n) (manifold pressure) gauge utilises an aneroid pressure diaphragm.

(both bellows and aneroid → manifold)

Question 3

In order to measure Cylinder Head Temperature, a (…) is used.

Answer 3

In order to measure Cylinder Head Temperature, a (thermocouple) is used.

Question 4

A vibration indicator indicates vibration (frequency/amplitude/period)

Answer 4

A vibration indicator indicates vibration (amplitude) at a given frequency.

Question 5

T_°C ⇔ T_°F

Answer 5

T_°F = T_°C • 1.8 + 32

T_°C = (T_°F - 32) ÷ 1.8

Question 6

An electronic torque meter uses (helical cut gears/rotation speed/twisting of the shaft) to measure torque.

Answer 6

An electronic torque meter uses (twisting of the shaft)​ to measure torque.

Question 7

A Bourdon tube is mostly used to measure (low/medium/high) ​pressure.

Answer 7

A Bourdon tube is mostly used to measure (high) pressure.

Question 8

An aneroid capsule is mostly used to measure (low/medium/high) ​pressure.

Answer 8

An aneroid capsule is mostly used to measure (low) pressure.

Question 9

N₁ is the rotational speed of the (…)​.

Answer 9

N₁ is the rotational speed of the (low pressure shaft or fan).

Question 10

A(n) (fuel pressure/manifold pressure/oil pressure)​ gauge utilises a bellows sensor.

Answer 10

A(n) (manifold pressure) gauge utilises a bellows sensor.

(both bellows and aneroid → manifold)

Question 11

In response to a temperature rise, a thermo-couple increases its (current/voltage/resistance/length)​.

Answer 11

In response to a temperature rise, a thermo-couple increases its (voltage).

Question 12

An electrical torque meter uses (helical cut gears/rotation speed/twisting of the shaft) to measure torque.

Answer 12

An electrical torque meter uses (rotation speed)​ to measure torque.

Question 13

An oil torque meter uses (helical cut gears/rotation speed/twisting of the shaft) to measure torque.

Answer 13

An oil torque meter uses (helical cut gears)​ to measure torque.

Question 14

On an airplane with two engines installed, a synchroscope works on the basis of a (galvanometer/voltmeter/ammeter) which is fed by two (alternators/tachometer-gennies)​.

Answer 14

On an airplane with two engines installed, a synchroscope works on the basis of a (voltmeter) which is fed by two (tachometer-gennies).

Question 15

Hydraulic pressure is sensed by a (Bourdon tube/diaphragm/aneroid capsule/transducer)

Answer 15

Hydraulic pressure is sensed by a (diaphragm) that receives a hydraulic signal from the accumulator.

Question 16

The gauge indicating the quantity of fuel measured by a capacity gauging system can be graduated directly in weight unites because the dielectric constant of fuel is (the same as/twice) that of air and varies (directly/inversely)​ with density.

Answer 16

The gauge indicating the quantity of fuel measured by a capacity gauging system can be graduated directly in weight unites because the dielectric constant of fuel is (twice) that of air and varies (directly) with density.

Question 17

The white sector of the arc of a temperature gauge corresponds to a (…)​ operating range.

Answer 17

The white sector of the arc of a temperature gauge corresponds to a (special) operating range.

Question 18

Engine Pressure Ratio

Answer 18

EPR = Engine Pressure Ratio

Question 19

The reference of master engine of a synchroscope is usually the (inner/outer) (left/right) ​engine.

Answer 19

The reference of master engine of a synchroscope is usually the (outer) (left) engine.

Question 20

Brake Horse Power

Answer 20

BHP = T • RPM • constant

BHP ~ T • RPM (~ = proportional)

• BHP = Brake Horse Power*
• T = Torque [Nm]*
• RPM = Revolutions per minute*

Question 21

Moment

Answer 21

M = F • a

• M = moment [Nm]*
• F = force [N]*
• a = arm [m]*

Question 22

A magnetic sensor is used in a(n) (mechanical/electric/electronic)​ tachometer.

Answer 22

A magnetic sensor is used in a(n) (electronic) tachometer.

Question 23

Capacitance

Answer 23

• C = capacitance [F] (Farads)*
• q = charge [coulomb]*
• U = voltage [V]*
• e = dielectric permittivity [F/m] (Farads per meter)*
• A = area of plates [m²]*
• d = distance between plates [m]*

Question 24

Torque can be determined by measuring the change in (phase/frequency)​ between the torque shaft and the reference shaft.

Answer 24

Torque can be determined by measuring the change in (phase) between the torque shaft and the reference shaft.

Question 25

• E = electromotive force (emf)*
• T_c = cold junction temperature*
• T_h = hot junction temperature*
• K = constant*

The relationship that applies to a thermocouple is (…).

Answer 25

• E = electromotive force (emf)*
• T_c = cold junction temperature*
• T_h = hot junction temperature*
• K = constant*

The relationship that applies to a thermocouple is (E = K • T_h).

Question 26

Work and power

Answer 26

P = T • Ω

P = T • n

P = work done/time

• P = power [W]*
• T = torque [Nm]*
• Ω = angular velocity [radians/s]*
• n = RPM*

Question 27

A bellows sensor is mostly used to measure (low/medium/high) ​pressure.

Answer 27

A bellows sensor is mostly used to measure (medium) pressure.