**1.** The nature of emf induced in the armature of a dc generator is _____ and it is converted into _____ by means of split rings.

- DC : AC
- AC : AC
- DC : DC
- AC : DC

**2.** A dc shunt generator has a critical field resistance of 400 Ω at 1200 rpm. Now if the speed of the generator is increased to 1800 rpm what is the change in the critical resistance?

- Increases to 900 Ω
- Remains the same
- Increases to 600 Ω
- Decreases to 267 Ω

**3.** A dc generator running at 1200 rpm has voltage regulation of 6%. When it runs at 1400 rpm, what will happen to its voltage regulation?

- Increase
- Decrease
- Remains at 6%
- Become zero

**4.** A 300 V of separately excited dc generator is run at rated speed without excitation, the terminal voltage on no-load condition will be:

**5.** An eight-pole D.C. generator has a simple wave wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 wb. The machine is running at 250 rpm. The induced armature voltage is

**6.** A shunt generator has a critical field resistance of 200 ohm at a speed of 800 rpm. If the speed of the generator is increased to 1000 rpm, what is the change in critical field resistance of the generator?

- Decrease to 160 ohm
- Remains the same at 200 ohm
- Increases to 250 ohm
- Increases to 312.5 ohm

**7.** Identify the increasing order of voltage regulation of the following dc generator as same load

- Differential compound, shunt and under compound
- Shunt, differential compound and under compound
- Under compound, shunt and differential compound
- Shunt, under compound and differential compound

**8.** The residual magnetism of a D.C. shunt generator can be regained by

- Connecting the shunt field to the battery
- Running the generator on no load for some time
- Grounding the shunt field
- Reversing the direction of rotation of the generator

**9.** In a DC generator, generated emf is directly proportional to _____

- Armature current
- Pole flux
- Number of armature parallel paths
- All of the above

**10.** In a D. C. generator the critical resistance can be increased by ________

- Increasing its field resistance
- Decreasing its field resistance
- Increasing its speed
- Decreasing its speed

**11.** The slight curvature at the lower end of the OCC of a self-excited dc generator is due to

- Magnetic inertia
- Residual flux
- High speed
- High field resistance

**12.** A shunt generator develops stable output voltage if

- Magnetization characteristic is linear
- Magnetization characteristic is non-linear
- The field winding resistance is less than the critical resistance
- The residual magnetism is equal to zero