Quiz For Lesson 18 Part-B:

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Question 1: Figure T1 shows the exposure meter circuit from the Nikkormat FT. Changing the diaphragm setting, the film speed setting, or the shutter speed setting moves the slider of resistor R1. From the schematic, you can tell that the semiautomatic metering system in the Nikkormat uses:

Electrical cross-coupling
Mechanical cross-coupling

Question 2: Moving the slider of resistor R1 in Figure T1 has:

More effect at higher light levels
More effect at lower light levels
The same effect at all light levels
More effect at mid-range light levels

Question 3: When checking a Nikkormat circuit, shown in Figure T1, you find that the needle fails to deflect, regardless of the light conditions or the meter settings. The problem could be:

The slider on R1 is not making contact
The on/off switch is not making contact
Resistor R4 is open
The ground connection to the slider of R1 is defective

Question 4: Another Nikkormat exposure meter always deflects the same amount as you change the shutter speed settings. The problem could be:

The slider on R1 is not making contact
The galvanometer has an open coil
Resistor R3 is open
Resistor R2 is open
The on/off switch is not making contact

Question 5: A balanced-bridge exposure meter is balanced when:

A maximum amount of current flows through the bridge
Current flows in both directions through the bridge, but the two currents cancel one another
No current flows through the bridge
The resistance of the photocells equals the resistance of the galvanometer

Question 6: The bridge portion of a balanced-bridge exposure meter contains the:

Shutter-speed resistor
Photocells
Calibration resistor
Galvanometer

Question 7: Current Spotmatic models, such as the K1000, use an additional resistor ring not found in the models using the balanced-bridge circuit. Since the K1000 provides full-aperture metering rather than stopped-down metering, the additional resistor must program the meter for two variables not required in the stopped-down models. These variables are:

1

2

Question 8: In the Canon FTb, changing the diaphragm setting:

Changes in the amount of current through the galvanometer
Rotates the galvanometer in position
Changes the resistance of the diaphragm resistor
Moves the pointer

Question 9: In the Canon FTb, you notice that the exposure-meter error is the same throughout the range of light levels. Which adjustment in Figure T2 would provide the same amount of correction at each light level?

R1
R2
R3
The eccentric

Question 10: Consider that you've had to use all of the exposure-accuracy adjustments when calibrating a Canon FTb exposure meter. Your adjustments for the accuracy have then disturbed the reading at the battery-test function:

True
False

Question 11: You're working on a Canon FTb in which the needle will not deflect when you close the battery-test switch. However, the needle deflects properly for the exposure readout. The problem could be that the moveable blade of the battery-test switch is shorted to ground:

True
False

Question 12: Changing the shutter speed setting in the Minolta SRT models:

Moves the pointer
Rotates the galvanometer
Changes the position of the galvanometer needle
Changes an electrical value in the circuit

Question 13: A customer with a Minolta SRT camera complains that the meter does not operate when he's using his non-coupled lenses in the stopped-down mode. However, the meter works properly when he's using a coupled MC lens in the full-aperture mode. Which of the following switches would you immediately suspect is the problem?

The stopped-down switch
The exposure-meter switch
The battery-test switch
The override switch

Question 14: You're checking a trap-needle system in which the exposure-meter needle indicates the proper aperture. However, you find that the diaphragm automatically programs too large an aperture when you measure the light at the focal-plane aperture. The diaphragm stops down the proper amount when using manual-exposure settings. You must now:

Adjust the exposure meter to indicate a larger aperture
Adjust the exposure meter to indicate a smaller aperture
Adjust the trap-needle linkage to allow the aperture to stop down further
Adjust the diaphragm in the lens to stop down further for the same light conditions

Question 15: A customer brings in a Konica trap-needle SLR which is consistantly overexposing the film. When checking the diaphragm closure on automatic, you notice that the camera always programs the largest aperture, regardless of the light conditions. The problem could be:

The galvanometer needle is broken
The vane lever is out of adjustment
The photocells are shorted
The galvanometer coil is open

Question 16: In the Konica Autoreflex T3, the trap-needle linkage controls the movement of the:

Diaphragm-closing lever
Lens-sensing slide
Auto-control ring
Diaphragm-sensing lever

Question 17: Refer to Figure 65 in your text.

The galvanometer is open
The photocells are open
Poor slider contact on VR2
Poor slider contact on VR1

Question 18: When checking a moving-vane exposure meter, you find that the vanes always remain at the largest-aperture position, regardless of the light conditions. The moving-vane system that you're checking uses a selenium-cell exposure meter. What are the first two things you should check?

1

2

Question 19: You've replaced the coupling cord in a mechanically cross-coupled exposure meter system. However, the cord has stretched during use. Since the cord's length is now different from what it was when you calibrated the exposure meter, the accuracy would be disturbed. What effect would the different cord length have?

The meter error would be greater as you increase the light level
The meter error would be greater as you decrease the light level
The meter error would be greatest at the mid-range light levels
The meter error would be the same at all light levels

Question 20: When checking a trap-needle system, you find that the diaphragm always stops down to the same aperture in auto-exposure mode. Suppose that the camera always programs f5.6. You then check the diaphragm after removing the lens and discover that it works properly. Describe a malfunction in the camera's metering system that could be causing the problem.